Taxes - Summary of Components of Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
U.S. federal
Current	$ (73)	$ (181)	$ (382)
Deferred	(1,074)	738	(2,561)
State and local
Current	153	183	(97)
Deferred	(172)	(16)	66
Total United States	(1,166)	724	(2,974)
International
Current	4,577	4,662	3,634
Deferred	(720)	329	(708)
Total International	3,857	4,991	2,926
Total income tax expense (benefit)	$ 2,691	$ 5,715	$ (48)

Federal and state and local taxes on income.

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