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Stockholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2017
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,
| 2017 |  | 2016 |  | 2015
| Shares |  | Dollars |  | Shares |  | Dollars |  | Shares |  | Dollars
First quarter | 3.4 |  |  | $ | 555 |  |  | 4.7 |  |  | $ | 690 |  |  | 2.9 |  |  | $ | 451 |
Second quarter | 6.2 |  |  | 1,006 |  |  | 3.9 |  |  | 591 |  |  | 3.3 |  |  | 515 |
Third quarter | 4.4 |  |  | 769 |  |  | 4.4 |  |  | 747 |  |  | 4.6 |  |  | 703 |
Fourth quarter | 4.5 |  |  | 796 |  |  | 6.7 |  |  | 999 |  |  | 1.2 |  |  | 184 |
Total stock repurchases | 18.5 |  |  | $ | 3,126 |  |  | 19.7 |  |  | $ | 3,027 |  |  | 12.0 |  |  | $ | 1,853 |
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, 2014 | $ | (264 | ) |  | $ | 290 |  |  | $ | (19 | ) |  | $ | (15 | ) |  | $ | (8 | )
Foreign currency translation adjustments | (257 | ) |  | — |  |  | — |  |  | — |  |  | (257 | )
Unrealized gains (losses) | — |  |  | 150 |  |  | (299 | ) |  | 8 |  |  | (141 | )
Reclassification adjustments to income | — |  |  | (143 | ) |  | 76 |  |  | — |  |  | (67 | )
Other | — |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Income taxes | 10 |  |  | — |  |  | (18 | ) |  | — |  |  | (8 | )
Balance as of December 31, 2015 | (511 | ) |  | 297 |  |  | (260 | ) |  | (6 | ) |  | (480 | )
Foreign currency translation adjustments | (93 | ) |  | — |  |  | — |  |  | — |  |  | (93 | )
Unrealized (losses) gains | — |  |  | (176 | ) |  | 63 |  |  | — |  |  | (113 | )
Reclassification adjustments to income | — |  |  | 139 |  |  | 61 |  |  | — |  |  | 200 |
Other | — |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Income taxes | (6 | ) |  | 22 |  |  | (2 | ) |  | — |  |  | 14 |
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 | — |  |  | — |  |  | — |  |  | 5 |  |  | 5 |
Income taxes | 4 |  |  | 158 |  |  | (1 | ) |  | — |  |  | 161 |
Balance as of December 31, 2017 | $ | (529 | ) |  | $ | (6 | ) |  | $ | (144 | ) |  | $ | — |  |  | $ | (679 | )
Reclassifications out of accumulated other comprehensive income | The reclassifications out of AOCI to earnings were as follows (in millions):
|  | Years ended December 31, |  |
Components of AOCI |  | 2017 |  | 2016 |  | 2015 |  | Consolidated Statements of Income location
Cash flow hedges: |  |  |  |  |  |  |  |
Foreign currency contract gains |  | $ | 65 |  |  | $ | 308 |  |  | $ | 326 |  |  | Product sales
Cross-currency swap contract gains (losses) |  | 574 |  |  | (446 | ) |  | (182 | ) |  | Interest and other income, net
Forward interest rate contract losses |  | (1 | ) |  | (1 | ) |  | (1 | ) |  | Interest expense, net
|  | 638 |  |  | (139 | ) |  | 143 |  |  | Income before income taxes
|  | (226 | ) |  | 46 |  |  | (53 | ) |  | Provision for income taxes
|  | $ | 412 |  |  | $ | (93 | ) |  | $ | 90 |  |  | Net income
Available-for-sale securities: |  |  |  |  |  |  |  |
Net realized losses |  | $ | (41 | ) |  | $ | (61 | ) |  | $ | (76 | ) |  | Interest and other income, net
|  | (8 | ) |  | 11 |  |  | 18 |  |  | Provision for income taxes
|  | $ | (49 | ) |  | $ | (50 | ) |  | $ | (58 | ) |  | Net income

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