Derivative Financial Instruments (Schedule of Changes in Fair Value of Derivatives) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011		Jun. 30, 2010
Derivatives designated as cash flow hedging instruments
Gain (Loss) Recognized in Other Comprehensive Income			$ (17)		$ (23)
Gain (Loss) Recognized in Income			(48)		3
Derivatives not designated as hedging instruments
Gain (Loss) Recognized in Other Comprehensive Income			(17)		(23)
Gain (Loss) Recognized in Income			(48)		3
Tax expense recognized in Other comprehensive income (loss)	3	3	11		5
Interest Expense [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as cash flow hedging instruments
Gain (Loss) Recognized in Income			(30)	[1]	(35)	[1]
Derivatives not designated as hedging instruments
Gain (Loss) Recognized in Income			(30)	[1]	(35)	[1]
Interest Expense [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivatives designated as cash flow hedging instruments
Gain (Loss) Recognized in Income			(3)	[2]	0
Derivatives not designated as hedging instruments
Gain (Loss) Recognized in Income			(3)	[2]	0
Foreign Currency Gain (Loss) [Member] | Foreign Currency Forwards and Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivatives designated as cash flow hedging instruments
Gain (Loss) Recognized in Income			(15)	[3]	38	[3]
Derivatives not designated as hedging instruments
Gain (Loss) Recognized in Income			(15)	[3]	38	[3]
Foreign Currency Forwards and Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivatives designated as cash flow hedging instruments
Gain (Loss) Recognized in Other Comprehensive Income			0		0
Derivatives not designated as hedging instruments
Gain (Loss) Recognized in Other Comprehensive Income			0		0
Equity Method Investments' Derivative [Member]
Derivatives not designated as hedging instruments
Loss associated with equity method investments' derivative			1		5
Interest Rate Swap [Member]
Derivatives not designated as hedging instruments
Tax expense recognized in Other comprehensive income (loss)			6		4
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives designated as cash flow hedging instruments
Gain (Loss) Recognized in Other Comprehensive Income			(17)	[4]	(23)	[5]
Derivatives not designated as hedging instruments
Gain (Loss) Recognized in Other Comprehensive Income			(17)	[4]	(23)	[5]
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivatives designated as cash flow hedging instruments
Gain (Loss) Recognized in Other Comprehensive Income			0		0
Derivatives not designated as hedging instruments
Gain (Loss) Recognized in Other Comprehensive Income			$ 0		$ 0

[1] Amount represents reclassification from Accumulated other comprehensive income (loss), net and is included as Interest expense in the unaudited interim consolidated statements of operations.

[2] Included in Interest expense in the unaudited interim consolidated statements of operations.

[3] Included in Foreign exchange gain (loss), net for operating activity or Other income (expense), net for non-operating activity in the unaudited interim consolidated statements of operations.

[4] Amount excludes $1 million of losses associated with the Company's equity method investments' derivative activity and $6 million of tax expense recognized in Other comprehensive income (loss).

[5] Amount excludes $5 million of losses associated with the Company's equity method investments' derivative activity and $4 million of tax expense recognized in Other comprehensive income (loss).