Hedging Activities and Fair Value Measurements (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) units	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) units	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	$ 8,374		$ 8,374		$ 5,923
Cost of Products Sold	672	$ 637	2,084	$ 1,919
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax				(88)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax				32
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	45	(15)	105	(56)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax				(69)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax				25
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	(1)	9	(20)	44
Interest Expense	58	57	177	172
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax	(8)	0	(13)	0
Other Comprehensive Income (Loss), Designated Derivative Instruments, before Reclassifications, before Tax	63		160
Other Comprehensive Income (Loss), Designated Derivative Instruments, before Reclassifications, Tax	(14)		(36)
Other Comprehensive Income (Loss), Designated Derivative Instruments, before Reclassifications, Net of Tax	49		124
Other Comprehensive Income (Loss), Designated Derivative Instruments, Reclassification, Before Tax	(8)		9
Other Comprehensive Income (Loss), Designated Derivative Instruments, Reclassification, Tax	2		(2)
Other Comprehensive Income (Loss), Designated Derivative Instruments, Reclassification, Net of Tax	(6)		7	(44)
Derivative Assets	256		256		82
Derivative Liabilities	44		44		90
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	1		1		15
Business Combination, Contingent Consideration, Liability	305		305		169
Cash	138		138		167
Debt Instrument, Fair Value Disclosure	6,821		6,821		5,945
Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax				(56)
Derivative Instruments in Hedges, Assets, at Fair Value	195		195		64
Derivative Instruments in Hedges, Liabilities, at Fair Value	14		14		69
Not Designated as Hedging Instrument [Member] | Other Nonoperating Income (Expense) [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	16	(13)	25	(25)
Foreign Currency Transaction Gain (Loss), before Tax	(23)	9	(40)	13
Net currency exchange gain (loss)	(6)	(4)	(15)	(12)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds, at Carrying Value	30		30		21
Equity Securities, FV-NI	1		1		15
Foreign Currency Contract, Asset, Fair Value Disclosure	256		256		82
Assets, Fair Value Disclosure	287		287		118
Foreign Currency Contracts, Liability, Fair Value Disclosure	44		44		90
Business Combination, Contingent Consideration, Liability	305		305		169
Financial and Nonfinancial Liabilities, Fair Value Disclosure	349		349		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	30		30		21
Equity Securities, FV-NI	1		1		15
Foreign Currency Contract, Asset, Fair Value Disclosure	0		0		0
Assets, Fair Value Disclosure	31		31		36
Foreign Currency Contracts, Liability, Fair Value Disclosure	0		0		0
Business Combination, Contingent Consideration, Liability	0		0		0
Financial and Nonfinancial 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
Equity Securities, FV-NI	0		0		0
Foreign Currency Contract, Asset, Fair Value Disclosure	256		256		82
Assets, Fair Value Disclosure	256		256		82
Foreign Currency Contracts, Liability, Fair Value Disclosure	44		44		90
Business Combination, Contingent Consideration, Liability	0		0		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	44		44		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
Equity Securities, FV-NI	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
Business Combination, Contingent Consideration, Liability	305		305		169
Financial and Nonfinancial Liabilities, Fair Value Disclosure	305		305		169
Interest Rate Contract [Member] | Fair Value Hedging [Member] | Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest Rate Fair Value Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	12		12
Interest Rate Contract [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	1		1
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member] | Cost of Products Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	43		43
Foreign Exchange Contract [Member] | Net Investment Hedging [Member] | Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Used in Net Investment Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 41		$ 41
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Forward Currency Contracts, Time to Maturity | units	60		60
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Prepaid And Other Current Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	$ 48		$ 48		7
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Long-term Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	147		147		57
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	5		5		37
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Long-term Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	10		10		33
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	4,115		4,115		3,252
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Cost of Products Sold [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	58	(24)	135	(88)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	(13)	9	(30)	32
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	45	(15)	105	(56)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	2	(14)	27	(68)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	0	5	(6)	25
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	2	$ (9)	21	(43)
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax			0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax			0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax			0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax			1	(1)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax			0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax			(1)	$ (1)
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Net Investment Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	1,455		1,455		0
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | Interest Expense [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	4		25
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax	(1)		(6)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	3		19
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), Reclassification, before Tax	(10)		(17)
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), after Reclassification, Tax	2		4
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax	8		(13)
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount	2,804		2,804		2,671
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Prepaid And Other Current Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	61		61		18
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	$ 29		$ 29		$ 21