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Stockholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Summary of activity under our stock repurchase program | Activity under our stock repurchase program, on a trade date basis, was as follows (in millions):
| Years ended December 31,
| 2019 |  | 2018 |  | 2017
| Shares* |  | Dollars |  | Shares* |  | Dollars |  | Shares |  | Dollars
First quarter | 15.9 |  |  | $ | 3,031 |  |  | 56.4 |  |  | $ | 10,787 |  |  | 3.4 |  |  | $ | 555 |
Second quarter | 13.1 |  |  | 2,349 |  |  | 18.2 |  |  | 3,190 |  |  | 6.2 |  |  | 1,006 |
Third quarter | 6.2 |  |  | 1,170 |  |  | 8.7 |  |  | 1,713 |  |  | 4.4 |  |  | 769 |
Fourth quarter | 5.1 |  |  | 1,090 |  |  | 11.1 |  |  | 2,165 |  |  | 4.5 |  |  | 796 |
Total stock repurchases | 40.2 |  |  | $ | 7,640 |  |  | 94.5 |  |  | $ | 17,855 |  |  | 18.5 |  |  | $ | 3,126 |
* Total shares do not add due to rounding.
Components of accumulated other comprehensive income | 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, 2016 | $ | (610 | ) |  | $ | 282 |  |  | $ | (138 | ) |  | $ | (5 | ) |  | $ | (471 | )
Foreign currency translation adjustments | 77 |  |  | — |  |  | — |  |  | — |  |  | 77 |
Unrealized gains (losses) | — |  |  | 192 |  |  | (46 | ) |  | — |  |  | 146 |
Reclassification adjustments to income | — |  |  | (638 | ) |  | 41 |  |  | — |  |  | (597 | )
Other gains | — |  |  | — |  |  | — |  |  | 5 |  |  | 5 |
Income taxes | 4 |  |  | 158 |  |  | (1 | ) |  | — |  |  | 161 |
Balance as of December 31, 2017 | (529 | ) |  | (6 | ) |  | (144 | ) |  | — |  |  | (679 | )
Cumulative effect of change in accounting principle, net of tax | — |  |  | — |  |  | (9 | ) |  | — |  |  | (9 | )
Foreign currency translation adjustments | (141 | ) |  | — |  |  | — |  |  | — |  |  | (141 | )
Unrealized gains (losses) | — |  |  | 61 |  |  | (556 | ) |  | — |  |  | (495 | )
Reclassification adjustments to income | — |  |  | 262 |  |  | 365 |  |  | — |  |  | 627 |
Other losses | — |  |  | — |  |  | — |  |  | (2 | ) |  | (2 | )
Income taxes | — |  |  | (76 | ) |  | 6 |  |  | — |  |  | (70 | )
Balance as of December 31, 2018 | (670 | ) |  | 241 |  |  | (338 | ) |  | (2 | ) |  | (769 | )
Foreign currency translation adjustments | (48 | ) |  | — |  |  | — |  |  | — |  |  | (48 | )
Unrealized gains | — |  |  | 127 |  |  | 424 |  |  | — |  |  | 551 |
Reclassification adjustments to income | — |  |  | (211 | ) |  | (56 | ) |  | — |  |  | (267 | )
Other losses | — |  |  | — |  |  | — |  |  | (5 | ) |  | (5 | )
Income taxes | — |  |  | 18 |  |  | (8 | ) |  | — |  |  | 10 |
Balance as of December 31, 2019 | $ | (718 | ) |  | $ | 175 |  |  | $ | 22 |  |  | $ | (7 | ) |  | $ | (528 | )
Reclassifications out of accumulated other comprehensive income | Reclassifications out of AOCI and into earnings were as follows (in millions):
|  | Years ended December 31, |  |
Components of AOCI |  | 2019 |  | 2018 |  | 2017 |  | Consolidated Statements of Income locations
Cash flow hedges: |  |  |  |  |  |  |  |
Foreign currency contract gains (losses) |  | $ | 101 |  |  | $ | (21 | ) |  | $ | 65 |  |  | Product sales
Cross-currency swap contract gains (losses) |  | 110 |  |  | (241 | ) |  | 574 |  |  | Interest and other income, net
Forward interest rate contract losses |  | — |  |  | — |  |  | (1 | ) |  | Interest expense, net
|  | 211 |  |  | (262 | ) |  | 638 |  |  | Income before income taxes
|  | (46 | ) |  | 55 |  |  | (226 | ) |  | Provision for income taxes
|  | $ | 165 |  |  | $ | (207 | ) |  | $ | 412 |  |  | Net income
Available-for-sale securities: |  |  |  |  |  |  |  |
Net realized gains (losses) |  | $ | 56 |  |  | $ | (365 | ) |  | $ | (41 | ) |  | Interest and other income, net
|  | (14 | ) |  | 3 |  |  | (8 | ) |  | Provision for income taxes
|  | $ | 42 |  |  | $ | (362 | ) |  | $ | (49 | ) |  | Net income

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