Fair Value Measurements Fair Value of Derivatives by Balance Sheet Location (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Derivatives Fair Value [Line Items]
Goodwill and intangible asset impairment losses in period				$ 3,731,000,000	$ 709,000,000
Net gain (loss) from foreign currency transaction exposures	(19,000,000)	(3,000,000)		(25,000,000)	(1,000,000)
Goodwill impairment charge	3,602,000,000		697,000,000	3,602,000,000	697,000,000
Goodwill	6,474,000,000			6,474,000,000		9,761,000,000
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	10,000,000	27,000,000		26,000,000	46,000,000
Gain related to ineffective portion of hedging relationships	0	0			0
Unamortized losses on senior notes	4,000,000			4,000,000		4,000,000
Notional Amount of Interest Rate Derivatives	0			0		0
Unamortized gains on senior notes	68,000,000			68,000,000		73,000,000
Unrealized gain on interest rate cash flow hedges, pretax, AOCI	6,000,000			6,000,000		7,000,000
Derivative Assets	91,000,000			91,000,000		87,000,000
Derivative Liabilities	81,000,000			81,000,000		131,000,000
reduction of interest expense, related to amortization of previously terminated interest rate contracts	3,000,000			5,000,000
Foreign Currency Transaction Gain (Loss), Realized	(7,000,000)	(4,000,000)		(10,000,000)	(5,000,000)
Impairment of Intangible Assets (Excluding Goodwill)	(129,000,000)	(12,000,000)		(129,000,000)	(12,000,000)
Designated as Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	64,000,000			64,000,000		51,000,000
Derivative Instruments in Hedges, Liabilities, at Fair Value	65,000,000			65,000,000		118,000,000
Designated as Hedging Instrument [Member] | Prepaid And Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	31,000,000			31,000,000		31,000,000
Designated as Hedging Instrument [Member] | Other Long Term Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	33,000,000			33,000,000		20,000,000
Designated as Hedging Instrument [Member] | Other current liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	46,000,000			46,000,000		69,000,000
Designated as Hedging Instrument [Member] | Other Long Term Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	19,000,000			19,000,000		49,000,000
Not Designated as Hedging Instrument [Member] | Prepaid And Other Current Assets [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	27,000,000			27,000,000		36,000,000
Not Designated as Hedging Instrument [Member] | Other current liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	16,000,000			16,000,000		13,000,000
U.S. CRM Reporting Unit [Member]
Derivatives Fair Value [Line Items]
Allocated Goodwill	$ 965,000,000			$ 965,000,000