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Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
U.S. federal |  |  |
Current | $ (382) | $ (623) | $ (817)
Deferred | (2,561) | (1,558) | (580)
State and local |  |  |
Current | (97) | (15) | (187)
Deferred | 66 | (121) | (109)
Total United States | (2,974) | (2,317) | (1,693)
International |  |  |
Current | 3,634 | 2,744 | 2,997
Deferred | (708) | (2,156) | (1,172)
Total International | 2,926 | 588 | 1,825
Total income tax expense (benefit) | $ (48) | $ (1,729) | $ 132

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