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Income taxes - Provision (benefit) for income taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
U.S. federal - Current | $ 1,289 | $ 1,110 | $ 911
Non-U.S. - Current | 238 | 168 | 194
U.S. state - Current | 10 | 7 | 9
Total current income tax expense (benefit) | 1,537 | 1,285 | 1,114
U.S. federal - Deferred | (122) | (72) | (73)
Non-U.S. - Deferred | (80) | 14 | 11
U.S. state - Deferred | 0 | 3 | 1
Total deferred income tax expense (benefit) | (202) | (55) | (61)
Total U.S. federal income taxes | 1,167 | 1,038 | 838
Total Non-U.S. income taxes | 158 | 182 | 205
Total U.S. state income taxes | 10 | 10 | 10
Provision for income taxes | $ 1,335 | $ 1,230 | $ 1,053

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