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Taxes - Summary of Components of Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S. federal
Current	$ (181)	$ (382)	$ (623)
Deferred	738	(2,561)	(1,558)
State and local
Current	183	(97)	(15)
Deferred	(16)	66	(121)
Total United States	724	(2,974)	(2,317)
International
Current	4,662	3,634	2,744
Deferred	329	(708)	(2,156)
Total International	4,991	2,926	588
Total income tax expense (benefit)	$ 5,715	$ (48)	$ (1,729)

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