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Income Taxes - Income Tax Provision (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current taxes: [Abstract] |  |  |
Federal | $ 1,480 | $ 2,594 | $ 2,803
State | 499 | 464 | 511
Total current taxes | 1,979 | 3,058 | 3,314
Deferred taxes (benefits): [Abstract] |  |  |
Federal | 22 | (1,435) | 5
State | 1 | 14 | (2)
Total deferred income taxes | 23 | (1,421) | 3
Income taxes | $ 2,002 | $ 1,637 | $ 3,317

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