Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 779	$ 564
Decrease in income before income tax expense	1,970
Income (loss) before income tax expense	$ 2,177	$ 4,145
Effective tax rates	36.00%	14.00%