Hedging Activities and Fair Value Measurements (Details) € in Millions, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) units	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) units	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net			$ 32		$ 34
Derivative Instruments in Hedges, at Fair Value, Net	$ 9,420		9,420		10,218
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	(6)	$ 2	86	$ 58
Cost of Goods and Services Sold	791	758	1,596	1,488
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	20	11	37	18
Other Operating Income (Expense), Net	18		54
Interest Expense	91	89	179	198
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax	(5)	(8)	(9)	(16)
Derivative Asset, Fair Value, Gross Asset	402		402		321
Cash	251		251		165
Proceeds from secured borrowings relating to royalty arrangements			256
Derivative Liability, Fair Value, Gross Liability	1,036		1,036		1,037
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	0		0		1
Derivative Asset	241		241		216
Licensing arrangements, asset	273		273		332
Business Combination, Contingent Consideration, Liability	208		208		354
Licensing arrangements, liability	314		314		374
Debt Instrument, Fair Value Disclosure	10,947		10,947		11,020
Net Investment Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional Value of Outstanding Net Investment Hedges	1,946		1,946		1,950
Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	364		364		288
Derivative Instruments in Hedges, Liabilities, at Fair Value	$ 1,005		$ 1,005		1,009
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Forward Currency Contracts, Time to Maturity | units	60		60
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments in Hedges, at Fair Value, Net	$ 3,885		$ 3,885		4,377
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments in Hedges, at Fair Value, Net	3,589		3,589		3,891
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments in Hedges, at Fair Value, Net	967		967		953
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | foreign currency denominated in debt [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments in Hedges, at Fair Value, Net	979		979		997
Cost of Sales [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	107		107
Cost of Sales [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	(8)	2	111	75
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	2	(1)	(25)	(17)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	(6)	2	86	58
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(28)	(16)	(51)	(25)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	6	4	11	6
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	(21)	(12)	(39)	(19)
Interest Expense [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	(5)		(5)
Interest Expense [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	0	0	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	0	0	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	0	0	0	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	1	1	3	2
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	0	0	(1)	0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	1	1	2	1
Interest Expense [Member] | Net Investment Hedging [Member] | Foreign Exchange Contract [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	21		21
Interest Expense [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	(5)	(5)	17	28
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax	1	1	(25)	(6)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	(4)	(4)	(8)	22
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), Reclassification, before Tax	(6)	(10)	(12)	(21)
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), after Reclassification, Tax	1	2	3	5
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax	(5)	(8)	(9)	(16)
Interest Expense [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | foreign currency denominated in debt [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax	(22)		2
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax	5		3
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, after Tax	(17)		5
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), Reclassification, before Tax	0		0
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), after Reclassification, Tax	0		0
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax	0		0
Other Nonoperating Income (Expense) [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	6	(152)	(9)	(130)
Foreign Currency Transaction Gain (Loss), before Tax	(11)	(4)	(3)	2
Net currency exchange gain (loss)	(5)	(156)	(12)	(127)
Other Nonoperating Income (Expense) [Member] | Not Designated as Hedging Instrument [Member] | BTG Acquisition [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments		$ 151		$ 116
Licensing arrangement assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Proceeds from Royalties Received			(91)
Increase (Decrease) in Fair Value Adjustments on Other Assets (Liabilities) Carried at Fair Value under Fair Value Option			$ 13
Discount Rate, Fair Value Input			15.00%
Licensing arrangement liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Increase (Decrease) in Fair Value Adjustments on Other Assets (Liabilities) Carried at Fair Value under Fair Value Option			$ 17
Payments for Royalties			$ (99)
Discount Rate, Fair Value Input			13.00%
Euro-denominated outstanding debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	998		$ 998		1,004
Prepaid Expenses and Other Current Assets [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	124		124		72
Prepaid Expenses and Other Current Assets [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	37		37		33
Other Noncurrent Assets [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	241		241		216
Other Current Liabilities [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	2		2		3
Other Current Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value	31		31		29
Other Noncurrent Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	997		997		998
Other Noncurrent Liabilities [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	6		$ 6		8
Minimum [Member] | Licensing arrangement assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Discount Rate, Fair Value Input			11.00%
Minimum [Member] | Licensing arrangement liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Discount Rate, Fair Value Input			12.00%
Maximum [Member] | Licensing arrangement assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Discount Rate, Fair Value Input			15.00%
Maximum [Member] | Licensing arrangement liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Discount Rate, Fair Value Input			15.00%
November 2019 Aggregate Offering [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Long-term Debt					1,000	€ 900
December 2027 Notes [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Long-term Debt	$ 1,009		$ 1,009		1,011
Debt Instrument, Interest Rate, Stated Percentage	0.625%		0.625%
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Licensing arrangements, asset	$ 440		$ 440
Licensing arrangements, liability	488		488
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money Market Funds, at Carrying Value	1,473		1,473		50
Equity Securities, FV-NI	0		0		1
Derivative Asset	402		402		321
Licensing arrangements, asset	440		440		518
Derivative Liability	1,036		1,036		1,037
Business Combination, Contingent Consideration, Liability	208		208		354
Licensing arrangements, liability	488		488		571
Financial and Nonfinancial Liabilities, Fair Value Disclosure	1,732		1,732		1,963
Assets, Fair Value Disclosure	2,316		2,316		890
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	1,473		1,473		50
Equity Securities, FV-NI	0		0		1
Derivative Asset	0		0		0
Licensing arrangements, asset	0		0		0
Derivative Liability	0		0		0
Business Combination, Contingent Consideration, Liability	0		0		0
Licensing arrangements, liability	0		0		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0		0		0
Assets, Fair Value Disclosure	1,473		1,473		51
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
Derivative Asset	402		402		321
Licensing arrangements, asset	0		0		0
Derivative Liability	1,036		1,036		1,037
Business Combination, Contingent Consideration, Liability	0		0		0
Licensing arrangements, liability	0		0		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	1,036		1,036		1,037
Assets, Fair Value Disclosure	402		402		321
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
Derivative Asset	0		0		0
Licensing arrangements, asset	440		440		518
Derivative Liability	0		0		0
Business Combination, Contingent Consideration, Liability	208		208		354
Licensing arrangements, liability	488		488		571
Financial and Nonfinancial Liabilities, Fair Value Disclosure	696		696		925
Assets, Fair Value Disclosure	$ 440		$ 440		$ 518