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Income taxes - Provision for income taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Taxes calculated using the estimated annual effective tax rate | $ 458 | $ 325 | $ 840 | $ 606
Discrete tax items | (28) | (42) | (152) | (84)
Provision for income taxes | $ 430 | $ 283 | $ 688 | $ 522
Estimated annual effective tax rate | 31.00% | 30.00% | 31.00% | 30.00%
Actual effective tax rate | 29.00% | 26.00% | 25.00% | 25.00%

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