Derivative Financial Instruments (Schedule of Changes in Fair Value of Derivatives) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Derivative [Line Items]
Gain (loss) recognized in Other comprehensive income (loss)	$ 1		$ (5)		$ 1		$ (6)
Gain (loss) recognized in Earnings (loss)	(10)		13		(9)		6
Tax expense recognized in Other comprehensive income (loss)	3		1	[1]	4		5	[1]
Equity Method Investments' Derivative [Member]
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(1)				(1)
Foreign Currency Forwards and Swaps [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		(1)		2
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) recognized in Other comprehensive income (loss)	1	[2]	(5)	[3]	1	[4]	(6)
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]
Gain (loss) recognized in Earnings (loss)	(4)	[5]	(4)	[5]	(8)	[5]	(7)	[5]
Interest Expense [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) recognized in Earnings (loss)	1	[6]	0	[6]	3	[6]	0	[6]
Foreign Currency Gain (Loss) [Member] | Foreign Currency Forwards and Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) recognized in Earnings (loss)	$ (7)	[7]	$ 17	[7]	$ (4)	[8]	$ 13	[8]

[1] As Adjusted (Note 1)

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

[3] Amount excludes $1 million of tax benefit recognized in Other comprehensive income (loss).

[4] Amount excludes $1 million of losses associated with the Company's equity method investments' derivative activity and $2 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