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Stockholders' equity (Share Repurchase Program) (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Equity [Abstract] |  |  |  |  |  |  |  |
Stock repurchased, Shares | 4.6 | 6.5 | 3.7 | 3.0 | 2.6 | 4.3 | 14.8 | 9.9
Stock repurchased | $ 1,069 | $ 1,592 | $ 865 | $ 752 | $ 591 | $ 933 | $ 3,526 | $ 2,276

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