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Stockholders' equity - Components of AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | $ 3,661 | $ 6,700 | $ 9,409
Foreign currency translation adjustments | 50 | 496 | (135)
Unrealized gains (losses) | 28 | 84 | 158
Reclassification adjustments to income | (222) | 2 | 253
Other gains (losses) | 42 | 2 | 1
Income taxes | 44 | (19) | (88)
Ending balance | 6,232 | 3,661 | 6,700
AOCI |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (231) | (796) | (985)
Ending balance | (289) | (231) | (796)
Foreign currency translation |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (348) | (844) | (709)
Foreign currency translation adjustments | 50 | 496 | (135)
Unrealized gains (losses) | 0 | 0 | 0
Reclassification adjustments to income | 0 | 0 | 0
Other gains (losses) | 0 | 0 | 0
Income taxes | 0 | 0 | 0
Ending balance | (298) | (348) | (844)
Cash flow hedges |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | 128 | 61 | (263)
Foreign currency translation adjustments | 0 | 0 | 0
Unrealized gains (losses) | 28 | 84 | 159
Reclassification adjustments to income | (222) | 2 | 253
Other gains (losses) | 0 | 0 | 0
Income taxes | 44 | (19) | (88)
Ending balance | (22) | 128 | 61
Available-for-sale securities |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | 0 | 0 | 1
Foreign currency translation adjustments | 0 | 0 | 0
Unrealized gains (losses) | 0 | 0 | (1)
Reclassification adjustments to income | 0 | 0 | 0
Other gains (losses) | 0 | 0 | 0
Income taxes | 0 | 0 | 0
Ending balance | 0 | 0 | 0
Other |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (11) | (13) | (14)
Foreign currency translation adjustments | 0 | 0 | 0
Unrealized gains (losses) | 0 | 0 | 0
Reclassification adjustments to income | 0 | 0 | 0
Other gains (losses) | 42 | 2 | 1
Income taxes | 0 | 0 | 0
Ending balance | $ 31 | $ (11) | $ (13)

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