Derivatives And Risk Management (Summary Of Gains And Losses On Derivative Instruments) (Details) (USD $) In Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Amount of Gain (Loss) Recognized in Income	$ (1)		$ (8)		$ (2)		$ (12)
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Loss	(6)		0		(6)		0
Interest Rate Contracts [Member]
Reclassification of losses from accumulated other comprehensive loss to interest expenses	2		2		4		2
Interest Rate Contracts [Member] | Derivatives Designated As Hedging Instruments [Member]
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Loss	(6)		0		(6)		0
Interest Rate Contracts [Member] | Derivatives Designated As Hedging Instruments [Member] | Interest Expense [Member]
Amount of Gain (Loss) Recognized in Income	0		0		0		0
Interest Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Loss	0		0		0		0
Interest Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Interest Expense [Member]
Amount of Gain (Loss) Recognized in Income	(2)	[1]	(10)	[1]	(4)	[2]	(16)	[2]
Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Loss	0		0		0		0
Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Other Income Loss Net [Member]
Amount of Gain (Loss) Recognized in Income	1		2		2		4
Derivatives Not Designated As Hedging Instruments [Member]
Amount of Gain (Loss) Recognized in Income	(1)		(8)		(2)		(12)
Change in Unrealized Gain (Loss) Recognized in Accumulated Other Comprehensive Loss	$ 0		$ 0		$ 0		$ 0

[1] We reclassified $2 of losses from accumulated other comprehensive loss to interest expense during the three months ended June 30, 2011 and 2010 related to the 2008 and 2010 Swaps.

[2] We reclassified $4 and $2 of losses from accumulated other comprehensive loss to interest expense during the six months ended June 30, 2011 and 2010 related to the 2008 and 2010 Swaps