Fair Value Measurements Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
ERROR in label resolution.
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount			$ 450
ERROR in label resolution. | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ 59	$ 93
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	48	49
ERROR in label resolution.
Derivative Instruments, Gain (Loss) [Line Items]
Accrued Investment Income Receivable		7
Derivative, Notional Amount	2,197		1,458
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	48	49
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	70
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance	77		145
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	2,257		2,090
Gain (Loss) on Interest Rate Fair Value Hedge Ineffectiveness		8
Gain (loss) recognized in earnings for terminated interest rate swaps		35
Unamortized gains on senior notes	60		63
Unamortized losses on senior notes	(1)		(1)
Unrealized gain on interest rate cash flow hedges, pretax, AOCI	10		10
reduction of interest expense, related to amortization of previously terminated interest rate contracts	3	2
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	13
Derivative Assets	164		237
Derivative Liabilities	90		23
Time Deposits, at Carrying Value	15		31
Cash	232		170
Cost-method Investments, Aggregate Carrying Amount	46		45
Debt Instrument, Fair Value Disclosure	6,037		5,887
Loss on hedged debt obligation [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense, Other		(8)
Fair Value, Measurements, Recurring [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	91		118
Foreign Currency Contract, Asset, Fair Value Disclosure	164		237
Assets, Fair Value Disclosure	255		355
Foreign Currency Contracts, Liability, Fair Value Disclosure	90		23
Accrued Contingent Consideration	188		246
Liabilities, Fair Value Disclosure	278		269
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	91		118
Foreign Currency Contract, Asset, Fair Value Disclosure	0		0
Assets, Fair Value Disclosure	91		118
Foreign Currency Contracts, Liability, Fair Value Disclosure	0		0
Accrued Contingent Consideration	0		0
Liabilities, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	0		0
Foreign Currency Contract, Asset, Fair Value Disclosure	164		237
Assets, Fair Value Disclosure	164		237
Foreign Currency Contracts, Liability, Fair Value Disclosure	90		23
Accrued Contingent Consideration	0		0
Liabilities, Fair Value Disclosure	90		23
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	0		0
Foreign Currency Contract, Asset, Fair Value Disclosure	0		0
Assets, Fair Value Disclosure	0		0
Foreign Currency Contracts, Liability, Fair Value Disclosure	0		0
Accrued Contingent Consideration	188		246
Liabilities, Fair Value Disclosure	188		246
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	135		204
Derivative Instruments in Hedges, Liabilities, at Fair Value	28		1
Designated as Hedging Instrument [Member] | Prepaid And Other Current Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	101		138
Designated as Hedging Instrument [Member] | Other Long Term Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	34		66
Designated as Hedging Instrument [Member] | Other current liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	6		1
Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	22		0
Not Designated as Hedging Instrument [Member] | Prepaid And Other Current Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	29		33
Not Designated as Hedging Instrument [Member] | Other current liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	62		$ 22
Not Designated as Hedging Instrument [Member] | Other, net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(39)	23
Net gain (loss) from foreign currency transaction exposures	34	(33)
Foreign Currency Transaction Gain (Loss), Realized	(5)	(10)
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	59	93
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 48	$ 49