Derivative And Hedging Activities (Schedule Of Derivative Instruments, Gain (Loss) In Statement Of Financial Performance) (Details) (USD $) In Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Gain (loss) recognized in net income (loss)	$ (19)		$ 51		$ (18)		$ 81
Interest Rate Contracts Derivatives [Member] | Fair Value Derivatives [Member] | Interest Expense [Member]
Gain (loss) recognized in net income (loss)	5	[1]	5	[1]	11	[1]	13	[1]
Derivative instruments interest expense on hedges	9		5		21		15
Interest Rate Contracts Derivatives [Member] | Interest Expense [Member]
Gain (loss) recognized in net income (loss)	$ (6)		$ 46		$ (11)		$ 68

[1] Interest expense on items hedged during the Current Quarter, the Prior Quarter, the Current Period and the Prior Period was $9 million, $5 million, $21 million and $15 million, respectively, which is included in interest expense on the condensed consolidated statements of operations.