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, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Derivative [Line Items]
Gain (loss) recognized in Other comprehensive income (loss)	$ (5)		$ 1		$ (5)		$ 1
Gain (loss) recognized in Earnings (loss)	(2)		(10)		(4)		(9)
Tax expense recognized in Other comprehensive income (loss)	2		3		(10)		4
Equity Method Investments' Derivative [Member]
Derivative [Line Items]
Gain (loss) recognized in Earnings (loss)			1				1
Interest Rate Swap [Member]
Derivative [Line Items]
Tax expense recognized in Other comprehensive income (loss)	1		1		4		2
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) recognized in Other comprehensive income (loss)	(1)	[1]	1	[2]	(1)	[3]	1	[4]
Cross Currency Interest Rate Contract [Member]
Derivative [Line Items]
Tax expense recognized in Other comprehensive income (loss)	1				1
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) recognized in Other comprehensive income (loss)	(4)	[5]	0		(4)	[5]	0
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 Expense [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) recognized in Earnings (loss)	(2)	[6]	(3)	[6]	(2)	[6]	(5)	[6]
Other Income [Member] | Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) recognized in Earnings (loss)	3	[7]	0		3	[7]	0
Foreign Currency Gain (Loss) [Member] | Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (loss) recognized in Earnings (loss)	$ (3)	[8]	$ (7)	[8]	$ (5)	[8]	$ (4)	[8]

[1] Excludes $1 million of tax expense recognized in Other comprehensive income (loss).

[2] 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] Excludes $4 million of tax expense recognized in Other comprehensive income (loss).

[4] 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] Excludes $1 million of tax benefit recognized in Other comprehensive income (loss).

[6] Reclassified from Accumulated other comprehensive income (loss), net to Interest income (expense) in the unaudited interim consolidated statements of operations.

[7] Included in Other income (expense), net 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.