Derivative Financial Instruments (Schedule of Changes in Fair Value of Derivatives) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Derivative [Line Items]
Other Comprehensive Income (Loss), Net of Tax Portion Attributable To Equity Method Investee					$ (1)		$ (2)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	2	[1]	(2)		7		(1)
Derivative, Gain (Loss) on Derivative, Net	(13)		(17)		(22)		(11)
Gain (loss) recognized in Other comprehensive income (loss)	(2)		(6)		(1)		(12)
Tax expense recognized in Other comprehensive income (loss)	3		1	[2]	7		6	[2]
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) recognized in Other comprehensive income (loss)	0		0		0		0
Interest Rate Swap [Member]
Derivative [Line Items]
Tax expense recognized in Other comprehensive income (loss)	1				3
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) recognized in Other comprehensive income (loss)	(2)	[3]	(6)		(1)	[4]	(12)
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) recognized in Other comprehensive income (loss)	0		0		0		0
Interest Expense [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(3)	[5]	(4)	[5]	(8)	[5]	(11)	[5]
Interest Expense [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	[6]	0	[6]	0	[6]	0	[6]
Foreign Currency Gain (Loss) [Member] | Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (10)	[7]	$ (13)	[7]	$ (14)	[8]	$ 0	[8]

[1] Amount includes $1 million of gains associated with the Company's equity method investments' derivative activity

[2] As Adjusted (Note 1)

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

[4] Amount excludes $3 million of tax expense recognized in Other comprehensive income (loss).

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

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

[7] 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.

[8] 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