Derivative Financial Instruments (Schedule of Changes in Fair Value of Derivatives) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended						3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Foreign Currency Forwards and Swaps [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2010 Foreign Currency Forwards and Swaps [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2009 Foreign Currency Forwards and Swaps [Member] Not Designated as Hedging Instrument [Member]	Dec. 31, 2011 Equity Method Investments' Derivative [Member]	Dec. 31, 2011 Equity Method Investments' Derivative [Member]	Dec. 31, 2011 Interest Rate Swap [Member]	Dec. 31, 2011 Interest Rate Swap [Member]	Dec. 31, 2009 Interest Rate Swap [Member]	Dec. 31, 2011 Interest Rate Swap [Member] Designated as Hedging Instrument [Member]		Dec. 31, 2010 Interest Rate Swap [Member] Designated as Hedging Instrument [Member]		Dec. 31, 2009 Interest Rate Swap [Member] Designated as Hedging Instrument [Member]		Dec. 31, 2011 Interest Expense [Member] Interest Rate Swap [Member] Designated as Hedging Instrument [Member]		Dec. 31, 2010 Interest Expense [Member] Interest Rate Swap [Member] Designated as Hedging Instrument [Member]		Dec. 31, 2009 Interest Expense [Member] Interest Rate Swap [Member] Designated as Hedging Instrument [Member]		Dec. 31, 2011 Foreign Currency Gain (Loss) [Member] Foreign Currency Forwards and Swaps [Member] Not Designated as Hedging Instrument [Member]		Dec. 31, 2010 Foreign Currency Gain (Loss) [Member] Foreign Currency Forwards and Swaps [Member] Not Designated as Hedging Instrument [Member]		Dec. 31, 2009 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 Other Comprehensive Income	$ (24)	$ (31)	$ (40)	$ 0	$ 0	$ 0						$ (24)	[1]	$ (31)	[2]	$ (40)	[3]
Gain (Loss) Recognized in Income	(74)	(35)	(83)															(59)	[4]	(68)	[4]	(63)	[4]	(15)	[5]	33	[5]	(20)	[5]
Derivatives not designated as hedging instruments
Gain (Loss) Recognized in Other Comprehensive Income	(24)	(31)	(40)	0	0	0						(24)	[1]	(31)	[2]	(40)	[3]
Gain (Loss) Recognized in Income	(74)	(35)	(83)															(59)	[4]	(68)	[4]	(63)	[4]	(15)	[5]	33	[5]	(20)	[5]
Tax expense recognized in Other comprehensive income (loss)	(102)	(34)	(42)						10	15	8
Income (loss), associated with equity method investments'							$ (2)	$ (5)

[1] Amount excludes $2 million of gains associated with the Company’s equity method investments’ derivative activity and $10 million of tax expense recognized in Other comprehensive income (loss).

[2] Amount excludes $5 million of gains associated with the Company’s equity method investments’ derivative activity and $15 million of tax expense recognized in Other comprehensive income (loss).

[3] Amount excludes $8 million of tax expense.

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

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