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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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