Fair Value Measurements Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
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	$ (58)	$ 59
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	28	48
Derivative, Notional Amount	2,161		$ 2,271
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	28	48
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	30
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance	47		102
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	2,048		1,830
Unamortized gains on senior notes	48		51
Unrealized gain on interest rate cash flow hedges, pretax, AOCI	9		9
reduction of interest expense, related to amortization of previously terminated interest rate contracts	3	3
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	14
Derivative Assets	108		199
Derivative Liabilities	49		26
Available-for-sale Securities	28		20
Time Deposits, at Carrying Value			19
Cash	154		135
Cost-method Investments, Aggregate Carrying Amount	34		20
Debt Instrument, Fair Value Disclosure	5,794		5,739
Fair Value, Measurements, Recurring [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	2		42
Available-for-sale Securities	28		20
Foreign Currency Contract, Asset, Fair Value Disclosure	108		199
Assets, Fair Value Disclosure	138		261
Foreign Currency Contracts, Liability, Fair Value Disclosure	49		26
Accrued Contingent Consideration	126		204
Liabilities, Fair Value Disclosure	175		230
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	2		42
Available-for-sale Securities	28		20
Foreign Currency Contract, Asset, Fair Value Disclosure			0
Assets, Fair Value Disclosure	30		62
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
Available-for-sale Securities	0		0
Foreign Currency Contract, Asset, Fair Value Disclosure	108		199
Assets, Fair Value Disclosure	108		199
Foreign Currency Contracts, Liability, Fair Value Disclosure	49		26
Accrued Contingent Consideration	0		0
Liabilities, Fair Value Disclosure	49		26
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
Available-for-sale Securities	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	126		204
Liabilities, Fair Value Disclosure	126		204
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	91		163
Derivative Instruments in Hedges, Liabilities, at Fair Value	22		7
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	55		98
Designated as Hedging Instrument [Member] | Other Long Term Assets [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	36		65
Designated as Hedging Instrument [Member] | Other current liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	13		3
Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	9		4
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	17		36
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	27		$ 19
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	(17)	(39)
Net gain (loss) from foreign currency transaction exposures	17	34
Foreign Currency Transaction Gain (Loss), Realized	0	(5)
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	(58)	59
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 28	$ 48