Document And Entity Information [Abstract] Increase Decrease Derivative Liabilities The net change during the period in the carrying value of derivative instruments reported as liabilities that are due to be disposed of within one year (or the normal operating cycle, if longer). Derivative liabilities Net change in dealer receivables The net change during the reporting period in dealer/ wholesale receivables due to the reporting entity. Net change in wholesale receivables Net Increase Decrease In Wholesale Receivables Fair Value Measurements Disclosure [Abstract] Investments In Marketable Securities Disclosure [Abstract] Financing Receivables [Abstract] Commitmentsandcontingenciesdisclosureabstract [Abstract] Other Assets And Other Liabilties Disclosure [Abstract] Other Assets And Other Liabilties Disclosure Abstract Other Assets And Other Liabilties Disclosure [Text Block] Other Assets And Other Liabilties Disclosure Text Block Variable Interest Entities [Line Items] Variable interest entities Variable Interest Entity [Abstract] LIABILITIES Variable Interest Entities [Abstract] Variable interest entities abstract Interim Financial Data Disclosures [Abstract] Commitments And Contingencies 2011 Commitments and contingencies (See Note 13) Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur. Variable Interest Assets [Abstract] ASSETS Tax Provision Benefit On Net Unrealized Gain Loss Available For Sale Marketable Securities Definition:The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period Tax Provision (Benefit) On Net Unrealized Gain Loss On Available For Sale Marketable Securities ($20 million provision for Sept. 2010 and $16 million benefit for Sept. 2011) Tax Provision Benefit On Reclassification Adjustment For Net Gain Loss Included In Net Income Reclassification adjustment for net loss (net gain) included in net income, net of tax Tax Provision (Benefit) On Reclassification Adjustment For Net Gain Loss Included In Net Income ($3 million benefit for Sept. 2010 & $9 million benefit for Sept. 2011) Accounts Payable Accounts Payable And Accrued Liabilities Accounts Payable And Accrued Liabilities Abstract Gas Purchase Payable Accounts Payable Interest Bearing Accounts Payable Related Parties Accounts Payable Trade Accounts Payable Abstract Accounts Payable Underwriters Promoters And Employees Other Than Salaries And Wages Accounts Receivable Net Current Accrued Payroll Taxes Accrued Professional Fees Accrued Sales Commission Accrued Utilities Accrued Liabilities Accrued Liabilities Abstract Accrued Advertising Accrued Bonuses Accrued Exchange Fee Rebate Accrued Insurance Accrued Interest Receivable Member Accrued Rent Accrued Royalties Taxes Payable Taxes Payable Abstract Accrued Vacation Accumulated other comprehensive income Other Comprehensive Income Loss Additional Minimum Pension Liability Tax Effect Amortization Of Deferred Acquisition Costs DAC Additional paid-in-capital Depreciation Write Off Of Inventory Adjustments To Reconcile To Income Loss From Continuing Operations Adjustments To Reconcile To Income Loss From Continuing Operations Abstract Adjustments To Reconcile Income Loss To Net Cash Provided By Used In Continuing Operations Adjustments To Reconcile Income Loss To Net Cash Provided By Used In Continuing Operations Abstract Deferred Finance Cost Amortization Expense Amortization Of Financing Costs Amortization of deferred costs Amortization of deferred costs Due To Affiliate Due To Employees Due To Other Related Parties Current Due To Related Parties Due To Related Parties Current And Unclassified Abstract Due To Related Parties Noncurrent Antidilutive Shares Outstanding Asset Or Liability From Transfers Of Financial Assets Having No Reasonable Estimate Of Fair Value At Carrying Value Statement Of Financial Position Assets Or Liabilities From Transfers Of Financial Assets Having No Reasonable Estimate Of Fair Value Carrying Amount Net unrealized (loss) gain on available-for-sale marketable securities, net of tax Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax Business Acquisition Reason For Acquisition Capital Leases Lessee Balance Sheet Assets By Major Class Gross Cash and cash equivalents Cash and cash equivalents at the beginning of the period Cash and cash equivalents at the end of the period Interest paid Payments For Restructuring Net change in: Commercial Paper Commercial Paper Current Commitments And Contingencies Disclosure Text Block Common Stock Name Domain Class Of Common Stock Domain Common Stock Issued Employee Stock Trust Class Of Common Stock Line Items Common Stock Shares Subscriptions Common Stock Shares Authorized Common Stock Shares Issued Common Stock Shares Outstanding Class Of Common Stock Table Capital stock, no par value (100,000 shares authorized; 91,500 issued and outstanding) at September 30, 2011 and March 31, 2011 Common Stock Held In Trust Construction Payable Contract Receivable Retainage Contract Holder Receivables Advances from affiliates (Note 15) Convertible Notes Payable Convertible Preferred Stock Amount Of Preferred Dividends In Arrears Convertible Preferred Stock Contract Terms Convertible Preferred Stock Domain Convertible Preferred Stock Dividend Payment Rate Variable Convertible Preferred Stock Dividend Payment Terms Convertible Preferred Stock Dividend Preference Or Restrictions Convertible Preferred Stock Dividend Rate Percentage Or Per Dollar Amount Convertible Preferred Stock Liquidation Preference Convertible Preferred Stock Par Stated Value Per Share Convertible Preferred Stock Per Share Amounts Of Preferred Dividends In Arrears Convertible Preferred Stock Share Subscriptions Convertible Preferred Stock Shares Authorized Convertible Preferred Stock Shares Issued Convertible Preferred Stock Shares Outstanding Convertible Preferred Stock Voting Rights Class Of Convertible Preferred Stock Line Items Class Of Convertible Preferred Stock Table Convertible Subordinated Debt Inventory Write Down Real Estate Tax Expense Customer Securities For Which Entity Has Right To Sell Or Repledge Securities Type Domain Customer Securities For Which Entity Has Right To Sell Or Repledge Securities Type Debt Disclosure Text Block Deferred Compensation Liability Noncurrent Deferred Compensation Liability Noncurrent Abstract Deferred income taxes Deferred Income Tax Expense Benefit Deferred income taxes Deferred Policy Acquisition Cost Amortization Expense Depreciation and amortization Derivative Instruments And Hedging Activities Disclosure Text Block Other Comprehensive Income Loss Adjustments Tax Abstract Cash Provided By Used In Discontinued Operations Financing Activities Cash Provided By Used In Discontinued Operations Investing Activities Cash Provided By Used In Discontinued Operations Operating Activities Repayments to affiliates (Note 15) Repayments to affiliates (Note 15) Interest And Dividends Payable Dividends Payable Due To Officers Or Stockholders Income Loss From Equity Method Investments Accrued Employee Benefits Employee Related Liabilities Employee Related Liabilities Abstract Stock-based compensation Capital contribution for stock-based compensation Entity Wide Revenue By Major Customer Axis Insurance losses and loss adjustment expenses Fresh Start Balance Sheet Date Of Balance Sheet Net loss (gain) from sale of marketable securities Net loss (gain) from sale of marketable securities Gas Imbalance Payable Operating and administrative General Discussion Of Derivative Instruments And Hedging Activities Abstract General Partners Capital Account Abstract Net financing revenues Net financing revenues Other-than-temporary impairment on marketable securities Income Statement Abstract Income Loss From Discontinued Operations Net Of Tax Income Tax Disclosure Text Block Income taxes (received) paid, net Accrued Income Taxes Payable Income Taxes Receivable Increase Decrease In Accumulated Other Comprehensive Income Loss Abstract Other assets (Note 9) and accrued income Increase Decrease In Other Operating Assets Incremental Common Shares Attributable To Participating Nonvested Shares Insurance Receivable For Malpractice Interest Bearing Deposits At Carrying Value Interest expense Dealer Retail Total financing revenues Total financing revenues Interest Payable Interest Receivable Inventory Raw Materials Lease And Rental Expense Leveraged Lease Income Loss Leveraged Leases Income Statement Net Income From Leveraged Leases Total liabilities Total liabilities Total liabilities and shareholder's equity Total liabilities and shareholder's equity