Income Taxes - Additional Information (Details) € in Millions, $ in Millions		3 Months Ended								12 Months Ended
	Oct. 04, 2017 EUR (€)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Income Tax Disclosure [Abstract]
Provision for income taxes, net		$ 566	$ 569	$ 984	$ 744	$ 786	$ 494	$ 257	$ 836	$ 2,863	$ 2,374	$ 1,197
Cash taxes paid, net of refunds										1,713	881	1,184
Income Taxes [Line Items]
Accrued interest and penalties, net of federal income tax benefit, related to tax contingencies		83				$ 131				83	131
Interest and penalties, net of federal income tax benefit										(48)	4	20
International
Income Tax Disclosure [Abstract]
Provision for income taxes, net										743	$ 1,014	$ 434
Income Taxes [Line Items]
Net operating loss carryforwards		$ 13,400								$ 13,400
International | Luxembourg Tax Administration
Income Taxes [Line Items]
Tax examination, estimate of additional tax expense | €	€ 250