Fair Value Measurements (Details) $ in Millions		3 Months Ended	12 Months Ended
	Nov. 20, 2018 USD ($)	Dec. 31, 2018 USD ($) units	Dec. 31, 2018 USD ($) units	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			$ 1,448	$ 560	$ 408
Available-for-sale Securities		$ 0	0	15
Notional Amount of Interest Rate Derivatives		12,326	12,326	5,923
Derivative Instruments, Gain (Loss) [Line Items]
Cost Method Investments		94	94	81
Cash		133	133	167
Impairment of Intangible Assets (Excluding Goodwill)			35	4	11
Notional Amount of Interest Rate Derivatives		12,326	12,326	5,923
Debt Instrument, Fair Value Disclosure		7,239	7,239	5,945
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax			(96)	65
Cost of Goods and Services Sold			2,813	2,593	2,424
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax			(14)	42
Interest Expense			241	229	233
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax			21	0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds, at Carrying Value		13	13	21
Available-for-sale Securities		0	0	15
Foreign Currency Contract, Asset, Fair Value Disclosure		304	304	82
Assets, Fair Value Disclosure		318	318	118
Accrued Contingent Consideration		347	347	169
Liabilities, Fair Value Disclosure		427	427	259
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		13	13	21
Available-for-sale Securities		0	0	15
Foreign Currency Contract, Asset, Fair Value Disclosure		0	0	0
Assets, Fair Value Disclosure		14	14	36
Accrued Contingent Consideration		0	0	0
Liabilities, Fair Value Disclosure		0	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	0
Available-for-sale Securities		0	0	0
Foreign Currency Contract, Asset, Fair Value Disclosure		304	304	82
Assets, Fair Value Disclosure		304	304	82
Accrued Contingent Consideration		0	0	0
Liabilities, Fair Value Disclosure		80	80	90
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	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
Accrued Contingent Consideration		347	347	169
Liabilities, Fair Value Disclosure		347	347	169
Net Investment Hedging [Member] | Interest Expense [Member] | Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Used in Net Investment Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net		41	41
Cash Flow Hedging [Member] | Cost of Sales [Member] | Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months		56	56
Cash Flow Hedging [Member] | Interest Expense [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net		$ (43)	$ (43)
Designated as Hedging Instrument [Member] | Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Forward Currency Contracts, Time to Maturity | units		60	60
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount of Interest Rate Derivatives		$ 1,483	$ 1,483	0
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Interest Rate Derivatives		1,483	1,483	0
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Interest Expense [Member] | Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax			56
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax			(13)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax			43
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), Reclassification, before Tax			(27)
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), after Reclassification, Tax			6
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax			(21)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount of Interest Rate Derivatives		1,000	1,000	0
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Interest Rate Derivatives		1,000	1,000	0
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount of Interest Rate Derivatives		3,962	3,962	3,252
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Interest Rate Derivatives		3,962	3,962	3,252
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Cost of Sales [Member] | Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax			(19)	64	133
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax			(167)	101	(65)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax			38	(37)	23
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax			(130)	65	(40)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax			(4)	23	48
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax			15	(41)	(84)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Expense [Member] | Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax			(1)	(1)	(1)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax			(44)	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax			10	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax			(34)	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax			0	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax			(1)	(1)	(1)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional Amount of Interest Rate Derivatives		5,880	5,880	2,671
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Interest Rate Derivatives		5,880	5,880	2,671
Not Designated as Hedging Instrument [Member] | Other Nonoperating Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) from foreign currency transaction exposures			30	(10)	(7)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net			41	(25)	(20)
Foreign Currency Transaction Gain (Loss), Realized			11	$ (15)	$ (13)
Proposed BTG Acquisition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 3,311	4,225
derivative, notional amount translated		$ 2,550	$ 2,550