Fair Value Measurements Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion			$ 0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax			0
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	$ 2,111		2,111		$ 1,830
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net			0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax			0
Derivative Assets	83		83		199
Derivative Liabilities	92		92		26
Available-for-sale Securities	32		32		20
Foreign Currency Contracts, Liability, Fair Value Disclosure	3,218		3,218		2,271
Time Deposits, at Carrying Value					19
Cash	183		183		135
Cost-method Investments, Aggregate Carrying Amount	69		69		20
Debt Instrument, Fair Value Disclosure	6,032		6,032		5,739
Derivative, Notional Amount	5,329		5,329		4,101
Fair Value, Measurements, Recurring [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	27		27		42
Available-for-sale Securities	32		32		20
Foreign Currency Contract, Asset, Fair Value Disclosure	83		83		199
Assets, Fair Value Disclosure	142		142		261
Foreign Currency Contracts, Liability, Fair Value Disclosure	92		92		26
Accrued Contingent Consideration	81		81		204
Liabilities, Fair Value Disclosure	173		173		230
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Money Market Funds, at Carrying Value	27		27		42
Available-for-sale Securities	32		32		20
Foreign Currency Contract, Asset, Fair Value Disclosure	0		0		0
Assets, Fair Value Disclosure	59		59		62
Foreign Currency Contracts, Liability, Fair Value Disclosure	0		0		0
Accrued Contingent Consideration	0		0		0
Liabilities, Fair Value Disclosure	0		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		0
Available-for-sale Securities	0		0		0
Foreign Currency Contract, Asset, Fair Value Disclosure	83		83		199
Assets, Fair Value Disclosure	83		83		199
Foreign Currency Contracts, Liability, Fair Value Disclosure	92		92		26
Accrued Contingent Consideration	0		0		0
Liabilities, Fair Value Disclosure	92		92		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		0
Available-for-sale Securities	0		0		0
Foreign Currency Contract, Asset, Fair Value Disclosure	0		0		0
Assets, Fair Value Disclosure	0		0		0
Foreign Currency Contracts, Liability, Fair Value Disclosure	0		0		0
Accrued Contingent Consideration	81		81		204
Liabilities, Fair Value Disclosure	81		81		204
Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	66		66		163
Derivative Instruments in Hedges, Liabilities, at Fair Value	63		63		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	7		7		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	59		59		65
Designated as Hedging Instrument [Member] | Other current liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	38		38		3
Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	25		25		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		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	29		29		$ 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	(13)	$ (7)	(25)	$ (74)
Net gain (loss) from foreign currency transaction exposures	9	1	13	64
Foreign Currency Transaction Gain (Loss), Realized	(4)	(6)	(12)	(10)
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion			(88)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax			32
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net			(56)
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion			(69)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net			(44)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax			25
Fair Value Hedging [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	12		12
Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	1		1
Cash Flow Hedging [Member] | Cost of Goods, Product Line [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	(30)		(30)
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion	(24)	(22)	(88)	(180)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	9	8	32	65
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(15)	(14)	(56)	(115)
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion	(14)	(27)	(68)	(107)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(9)	(17)	(43)	(69)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	$ 5	$ 10	25	$ 38
Interest Rate Contract [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion			(1)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net			$ (1)