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Income taxes - Provision for income taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
U.S. federal - Current | $ 357 | $ 483 | $ 979
Non-U.S. - Current | 192 | 135 | 225
U.S. state - Current | 10 | 12 | 7
Total current income tax expense (benefit) | 559 | 630 | 1,211
U.S. federal - Deferred | (122) | 25 | (98)
Non-U.S. - Deferred | (15) | 56 | (8)
U.S. state - Deferred | 0 | 0 | 1
Total deferred income tax expense (benefit) | (137) | 81 | (105)
Total U.S. federal income taxes | 235 | 508 | 881
Total Non-U.S. income taxes | 177 | 191 | 217
Total U.S. state income taxes | 10 | 12 | 8
Provision for income taxes | $ 422 | $ 711 | $ 1,106

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