Income Taxes - Additional Information (Details) € in Millions, $ in Millions		3 Months Ended								6 Months Ended	12 Months Ended
	Oct. 04, 2017 EUR (€)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Income Tax Disclosure [Abstract]
Provision for income taxes, net		$ 786	$ 494	$ 257	$ 836	$ 327	$ 508	$ 74	$ 287		$ 2,374	$ 1,197	$ 769
Cash taxes paid, net of refunds											(881)	1,184	957
Provisional tax benefit for impact of the Act													(789)
Income Taxes [Line Items]
Unrecognized Tax Benefits		3,923				3,414					3,923	3,414	2,309	$ 1,710
Valuation allowance against the net deferred tax assets										$ 600
Tax credit carryforwards		1,700									1,700
Accrued interest and penalties, net of federal income tax benefit, related to tax contingencies		131				$ 127					131	127
Interest and penalties, net of federal income tax benefit											4	20	40
International
Income Tax Disclosure [Abstract]
Provision for income taxes, net											1,014	$ 434	$ 923
Income Taxes [Line Items]
Net operating loss carryforwards		$ 8,600									$ 8,600
International | Luxembourg Tax Administration
Income Taxes [Line Items]
Tax examination, estimate of additional tax expense | €	€ 250