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Stockholders' equity - Schedule of Components of AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | $ 6,232 | $ 3,661 | $ 6,700
Foreign currency translation adjustments | (76) | 50 | 496
Unrealized gains | 506 | 28 | 84
Reclassification adjustments to earnings | (117) | (222) | 2
Other | (10) | 42 | 2
Income taxes | (80) | 44 | (19)
Ending balance | 5,877 | 6,232 | 3,661
Foreign currency translation adjustments |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (298) | (348) | (844)
Foreign currency translation adjustments | (76) | 50 | 496
Unrealized gains | 0 | 0 | 0
Reclassification adjustments to earnings | 0 | 0 | 0
Other | 0 | 0 | 0
Income taxes | 0 | 0 | 0
Ending balance | (374) | (298) | (348)
Cash flow hedges |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (22) | 128 | 61
Foreign currency translation adjustments | 0 | 0 | 0
Unrealized gains | 506 | 28 | 84
Reclassification adjustments to earnings | (117) | (222) | 2
Other | 0 | 0 | 0
Income taxes | (80) | 44 | (19)
Ending balance | 287 | (22) | 128
Other |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | 31 | (11) | (13)
Foreign currency translation adjustments | 0 | 0 | 0
Unrealized gains | 0 | 0 | 0
Reclassification adjustments to earnings | 0 | 0 | 0
Other | (10) | 42 | 2
Income taxes | 0 | 0 | 0
Ending balance | 21 | 31 | (11)
AOCI |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Beginning balance | (289) | (231) | (796)
Ending balance | $ (66) | $ (289) | $ (231)

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