Income Taxes - Summary of the Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income (loss) before provision for income taxes	$ (2,973)	$ 2,410	$ (970)	$ 4,760
Provision for income taxes	$ 373	$ 535	$ 838	$ 917
Effective tax rate	(12.50%)	22.20%	(86.40%)	19.30%