Long-Term Investments (Schedule Of Net Investment In Leveraged Leases) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Long-Term Investments [Abstract]
Lease Receivables (net of Non-Recourse Debt)	$ 763	$ 896
Estimated Residual Value of Leased Assets	553	905
Total Investment in Rental Receivables	1,316	1,801
Unearned and Deferred Income	(435)	(546)
Gross Investments in Leases	881	1,255
Deferred Tax Liabilities	(716)	(899)
Net Investments in Leases	165	356
Gross Investments In Leases To Subsidiaries Of Dynegy Incorporated	$ 264

Gross Investments In Leases To Subsidiaries Of Dynergy Incorporated

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- Definition

Leveraged Leases Net Investment In Leveraged Leases Disclosure Investment In Leveraged Leases, Gross

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- Definition

The estimated portion of pretax income and investment tax credit remaining to be allocated to income over the lease term.

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Taxes arising from arrangements meeting the criteria for classification as leveraged leases due to timing differences between accounting and tax income recognition.

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The net investment in arrangements meeting the criteria for classification as leveraged leases including deferred taxes.

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- Definition

The gross rentals receivable equal to the future cash flows from the lessee.

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This element represents leveraged lease rentals receivable, net of that portion of the rental applicable to principal and interest on the nonrecourse debt.

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The estimate of the value of the leased asset at the end of the lease term.

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