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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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