Derivative And Hedging Activities (Schedule Of Derivative Instruments, Gain (Loss) In Statement Of Financial Performance) (Details) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in net income (loss)					$ (19)		$ 81
Interest Rate Contracts Derivatives [Member] | Fair Value Derivatives [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in net income (loss)	3	[1]	3	[1]	14	[1]	16	[1]
Derivative instruments interest expense on hedges	2		0		23		15
Interest Rate Contracts Derivatives [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in net income (loss)	$ (3)		$ (3)		$ (14)		$ 65

[1] Interest expense on items hedged during the Current Quarter, the Prior Quarter, the Current Period and the Prior Period was $2 million, $0, $23 million and $15 million, respectively, which is included in interest expense on the condensed consolidated statements of operations.