Income Taxes - Narrative (Details) € in Millions, $ in Millions, kr in Billions	1 Months Ended			3 Months Ended			6 Months Ended	12 Months Ended
	Jan. 31, 2020 USD ($)	Jan. 31, 2020 EUR (€)	Oct. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 SEK (kr)	Dec. 31, 2017 EUR (€)
Income Tax [Line Items]
Federal income tax provision at statutory rate								21.00%	21.00%	35.00%
Tax benefit								$ (130)	$ (29)	$ (878)
Deferred tax liability related to undistributed foreign earnings				$ 594	$ 0		$ 0	594	0
Valuation allowance				181	61		61	181	61
Reduction in unrecognized tax benefits resulting from Closing Agreement						$ 437		163	312	1
Additional federal and state cash payments related to Closing Agreement							345
Additional tax expense (benefit) for effects of U.S. Tax Reform Act					(340)
NOL carryforwards, foreign				32				32
Unrecognized tax benefits				1,037	926		926	1,037	926	1,138	$ 846
Unrecognized tax benefits that would affect effective tax rate				661				661
Accrued interest and penalties related to uncertain tax positions				72	87		87	72	87	121
Interest expense related to uncertain tax positions								14	11	28
King Acquisition
Income Tax [Line Items]
Uncertain tax position assumed											$ 74
State
Income Tax [Line Items]
Tax credit carryforward				191				191
R&D Credit
Income Tax [Line Items]
Valuation allowance				71				71
Domestic Tax Authority
Income Tax [Line Items]
Additional federal and state cash payments related to Closing Agreement			$ 334
Swedish Tax Agency
Income Tax [Line Items]
Total assessment, including penalties and interest, not recorded					$ 375		$ 375		$ 375			kr 3.5
French Tax Authority
Income Tax [Line Items]
Tax expense (benefit) related to tax settlement								54
Total assessment, including penalties and interest, not recorded										$ 638			€ 571
French Tax Authority | Subsequent Events
Income Tax [Line Items]
Tax payments, including interest and penalties	$ 179	€ 161
Settlement From Closing Agreement
Income Tax [Line Items]
Tax expense (benefit) related to tax settlement						70
Indirect Tax Benefits Due to Closing Agreement
Income Tax [Line Items]
Tax expense (benefit) related to tax settlement						$ (185)
U.K.
Income Tax [Line Items]
Tax benefit				230
Net Deferred tax asset related to the amortizable tax basis in transferred intellectual property				1,100				1,100
Deferred tax liability related to undistributed foreign earnings				920				920
Valuation allowance				$ 110				$ 110
U.K. | Minimum
Income Tax [Line Items]
Amortizable tax basis, recovery period								3 years
U.K. | Maximum
Income Tax [Line Items]
Amortizable tax basis, recovery period								25 years