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Stockholders' equity (Components of AOCI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | $ 9,409 | $ 9,673 | $ 12,500
Foreign currency translation adjustments | (135) | 9 | (48)
Ending Balance | 6,700 | 9,409 | 9,673
Cumulative effect of changes in accounting principles, net of taxes |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance |  | (2) |
Ending Balance |  |  | (2)
Foreign currency translation [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | (709) | (718) | (670)
Foreign currency translation adjustments | (135) | 9 | (48)
Income taxes | 0 | 0 | 0
Ending Balance | (844) | (709) | (718)
Cash flow hedges [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | (263) | 175 | 241
Unrealized gains (losses) | 159 | (61) | 127
Reclassification adjustments to income | (253) | 501 | (211)
Income taxes | (88) | 124 | 18
Ending Balance | 61 | (263) | 175
Available-for-sale securities [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | 1 | 22 | (338)
Unrealized gains (losses) | (1) | 6 | 424
Reclassification adjustments to income | 0 | 33 | (56)
Income taxes | 0 | 6 | (8)
Ending Balance | 0 | 1 | 22
Other [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | (14) | (7) | (2)
Other gains | 1 | (7) | (5)
Ending Balance | (13) | (14) | (7)
AOCI [Member] |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning Balance | (985) | (528) | (769)
Foreign currency translation adjustments | (135) | 9 | (48)
Unrealized gains (losses) | 158 | (55) | 551
Reclassification adjustments to income | 253 | (534) | (267)
Other gains | 1 | (7) | (5)
Income taxes | (88) | 130 | 10
Ending Balance | $ (796) | $ (985) | $ (528)

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