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Taxes - Summary of Components of Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
U.S. federal
Current	$ (182)	$ (73)	$ (181)
Deferred	(1,315)	(1,074)	738
State and local
Current	65	153	183
Deferred	(152)	(172)	(16)
Total United States	(1,584)	(1,166)	724
International
Current	1,833	4,577	4,662
Deferred	(2,141)	(720)	329
Total International	(308)	3,857	4,991
Total income tax expense (benefit)	$ (1,892)	$ 2,691	$ 5,715

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