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Stockholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Summary of Stock Repurchase Program Activity | Activity under our stock repurchase program, on a trade date basis, was as follows (in millions):
| Years ended December 31,
| 2023 |  | 2022 |  | 2021
| Shares |  | Dollars |  | Shares |  | Dollars |  | Shares |  | Dollars
First quarter | — |  |  | $ | — |  |  | 24.6 |  |  | $ | 5,410 |  |  | 3.7 |  |  | $ | 865 |
Second quarter | — |  |  | — |  |  | — |  |  | — |  |  | 6.5 |  |  | 1,592 |
Third quarter | — |  |  | — |  |  | 1.5 |  |  | 900 |  |  | 4.6 |  |  | 1,069 |
Fourth quarter | — |  |  | — |  |  | — |  |  | — |  |  | 6.9 |  |  | 1,461 |
Total stock repurchases | — |  |  | $ | — |  |  | 26.1 |  | $ | 6,310 |  |  | 21.7 |  | $ | 4,987 |
Components of AOCI | The components of AOCI were as follows (in millions):
| Foreign currency translation |  | Cash flow hedges |  | Available-for-sale securities |  | Other |  | AOCI
Balance as of December 31, 2020 | $ | (709) |  |  | $ | (263) |  |  | $ | 1 |  |  | $ | (14) |  |  | $ | (985) |
Foreign currency translation adjustments | (135) |  |  | — |  |  | — |  |  | — |  |  | (135) |
Unrealized gains (losses) | — |  |  | 159 |  |  | (1) |  |  | — |  |  | 158 |
Reclassification adjustments to income | — |  |  | 253 |  |  | — |  |  | — |  |  | 253 |
Other gains | — |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Income taxes | — |  |  | (88) |  |  | — |  |  | — |  |  | (88) |
Balance as of December 31, 2021 | (844) |  |  | 61 |  |  | — |  |  | (13) |  |  | (796) |
Foreign currency translation adjustments | 496 |  |  | — |  |  | — |  |  | — |  |  | 496 |
Unrealized gains | — |  |  | 84 |  |  | — |  |  | — |  |  | 84 |
Reclassification adjustments to income | — |  |  | 2 |  |  | — |  |  | — |  |  | 2 |
Other gains | — |  |  | — |  |  | — |  |  | 2 |  |  | 2 |
Income taxes | — |  |  | (19) |  |  | — |  |  | — |  |  | (19) |
Balance as of December 31, 2022 | (348) |  |  | 128 |  |  | — |  |  | (11) |  |  | (231) |
Foreign currency translation adjustments | 50 |  |  | — |  |  | — |  |  | — |  |  | 50 |
Unrealized gains | — |  |  | 28 |  |  | — |  |  | — |  |  | 28 |
Reclassification adjustments to income | — |  |  | (222) |  |  | — |  |  | — |  |  | (222) |
Other gains | — |  |  | — |  |  | — |  |  | 42 |  |  | 42 |
Income taxes | — |  |  | 44 |  |  | — |  |  | — |  |  | 44 |
Balance as of December 31, 2023 | $ | (298) |  |  | $ | (22) |  |  | $ | — |  |  | $ | 31 |  |  | $ | (289) |
Reclassifications Out of AOCI | Reclassifications out of AOCI and into earnings were as follows (in millions):
|  | Years ended December 31, |  |
Components of AOCI |  | 2023 |  | 2022 |  | 2021 |  | Consolidated Statements of Income locations
Cash flow hedges: |  |  |  |  |  |  |  |
Foreign currency contract gains (losses) |  | $ | 180 |  |  | $ | 231 |  |  | $ | (8) |  |  | Product sales
Cross-currency swap contract gains (losses) |  | 42 |  |  | (233) |  |  | (245) |  |  | Other income (expense), net
|  | 222 |  |  | (2) |  |  | (253) |  |  | Income before income taxes
|  | (50) |  |  | — |  |  | 55 |  |  | Provision for income taxes
|  | $ | 172 |  |  | $ | (2) |  |  | $ | (198) |  |  | Net income

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