Fair Value Measurements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	$ 1
Cash Flow Hedging [Member] | Cost of Goods, Product Line [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	(31)
Fair Value Hedging [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	12
Interest Rate Contract [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(1)	$ (1)	$ (1)
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion	(1)	(1)	(2)
Available-for-sale Securities	15	20
Foreign Currency Contracts, Liability, Fair Value Disclosure	3,252	2,271
Cost Method Investments	81	20
Time Deposits, at Carrying Value		19
Cash	167	135
Impairment of Intangible Assets (Excluding Goodwill)	4	11	19
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net	2,671	1,830
Notional Amount of Interest Rate Derivatives	5,923	4,101
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion			11
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	0	0	7
Debt Instrument, Fair Value Disclosure	5,945	5,739
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	0	0	(4)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0	0	1
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | ERROR in label resolution. | Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(41)	(84)	(136)
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion		65	98
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(65)	40	63
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion	(101)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	37	(23)	(35)
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion	(64)	(133)	(213)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	23	48	77
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(42)	(85)	(137)
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion		65	109
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(65)	40	70
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion	(101)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	37	(23)	(39)
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion	(65)	(134)	(215)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	23	48	78
Not Designated as Hedging Instrument [Member] | Other, net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) from foreign currency transaction exposures	(10)	(7)	69
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(25)	(20)	48
Foreign Currency Transaction Gain (Loss), Realized	(15)	(13)	$ (21)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds, at Carrying Value	21	42
Available-for-sale Securities	15	20
Foreign Currency Contract, Asset, Fair Value Disclosure	82	199
Assets, Fair Value Disclosure	118	261
Foreign Currency Contracts, Liability, Fair Value Disclosure	90	26
Accrued Contingent Consideration	169	204
Liabilities, Fair Value Disclosure	259	230
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds, at Carrying Value	21	42
Available-for-sale Securities	15	20
Foreign Currency Contract, Asset, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	36	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]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds, at Carrying Value	0	0
Available-for-sale Securities	0	0
Foreign Currency Contract, Asset, Fair Value Disclosure	82	199
Assets, Fair Value Disclosure	82	199
Foreign Currency Contracts, Liability, Fair Value Disclosure	90	26
Accrued Contingent Consideration	0	0
Liabilities, Fair Value Disclosure	90	26
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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	169	204
Liabilities, Fair Value Disclosure	$ 169	$ 204