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, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Derivative [Line Items]
Tax expense recognized in Other comprehensive income (loss)	$ (14)		$ 3		$ (24)		$ 7
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	(9)		(2)		(14)		(1)
Gain (Loss) Recognized in Earnings (Loss)	24		(3)		25		(8)
Equity Method Investments' Derivative [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)			1
Gain (Loss) Recognized in Earnings (Loss)			1				1
Interest Rate Swap [Member]
Derivative [Line Items]
Tax expense recognized in Other comprehensive income (loss)			1		4		3
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	0		(2)	[1]	(1)	[2]	(1)	[3]
Cross Currency Interest Rate Contract [Member]
Derivative [Line Items]
Tax expense recognized in Other comprehensive income (loss)	3				4
Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	(9)	[4]	0		(13)	[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)	(1)	[6]	(3)	[6]	(3)	[6]	(8)	[6]
Other Income [Member] | Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Earnings (Loss)	25	[7]	0		28	[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)	(4)	[8]	(10)	[8]	(9)	[8]	(14)	[8]
Net Investment Hedging [Member]
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	9		0		9		0
Gain (Loss) Recognized in Earnings (Loss)	$ 0		$ 0		$ 0		$ 0

[1] 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).

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

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

[4] Excludes $3 million of tax benefit recognized in Other comprehensive income (loss).

[5] Excludes $4 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 for non-operating activity or Interest income (expense) for coupon interest 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.