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Income taxes - Provision for income taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
U.S. federal - Current | $ 483 | $ 979 | $ 2,101
Non-U.S. - Current | 135 | 225 | 173
U.S. state - Current | 12 | 7 | 12
Total current income tax expense (benefit) | 630 | 1,211 | 2,286
U.S. federal - Deferred | 25 | (98) | 51
Non-U.S. - Deferred | 56 | (8) | 61
U.S. state - Deferred | 0 | 1 | 0
Total deferred income tax expense (benefit) | 81 | (105) | 112
Total U.S. federal income taxes | 508 | 881 | 2,152
Total Non-U.S. income taxes | 191 | 217 | 234
Total U.S. state income taxes | 12 | 8 | 12
Provision for income taxes | $ 711 | $ 1,106 | $ 2,398

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