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Stockholders' equity (Tables) | 6 Months Ended
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Jun. 30, 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):
| 2019 |  | 2018
| Shares * |  | Dollars |  | Shares |  | Dollars
First quarter | 15.9 |  |  | $ | 3,031 |  |  | 56.4 |  |  | $ | 10,787 |
Second quarter | 13.1 |  |  | 2,349 |  |  | 18.2 |  |  | 3,190 |
Total stock repurchases | 28.9 |  |  | $ | 5,380 |  |  | 74.6 |  |  | $ | 13,977 |
Components of accumulated other comprehensive income | The components of Accumulated other comprehensive income (loss) (AOCI) were as follows (in millions):
| Foreign currency translation |  | Cash flow hedges |  | Available-for-sale securities |  | Other |  | AOCI
Balance as of December 31, 2018 | $ | (670 | ) |  | $ | 241 |  |  | $ | (338 | ) |  | $ | (2 | ) |  | $ | (769 | )
Foreign currency translation adjustments | (13 | ) |  | — |  |  | — |  |  | — |  |  | (13 | )
Unrealized gains | — |  |  | 30 |  |  | 218 |  |  | — |  |  | 248 |
Reclassification adjustments to income | — |  |  | 28 |  |  | 4 |  |  | — |  |  | 32 |
Income taxes | — |  |  | (13 | ) |  | (1 | ) |  | — |  |  | (14 | )
Balance as of March 31, 2019 | (683 | ) |  | 286 |  |  | (117 | ) |  | (2 | ) |  | (516 | )
Foreign currency translation adjustments | (4 | ) |  | — |  |  | — |  |  | — |  |  | (4 | )
Unrealized (losses) gains | — |  |  | (96 | ) |  | 161 |  |  | — |  |  | 65 |
Reclassification adjustments to income | — |  |  | (36 | ) |  | 2 |  |  | — |  |  | (34 | )
Other | — |  |  | — |  |  | — |  |  | 6 |  |  | 6 |
Income taxes | — |  |  | 28 |  |  | (10 | ) |  | — |  |  | 18 |
Balance as of June 30, 2019 | $ | (687 | ) |  | $ | 182 |  |  | $ | 36 |  |  | $ | 4 |  |  | $ | (465 | )
Reclassifications out of accumulated other comprehensive income | Reclassifications out of AOCI and into earnings were as follows (in millions):
|  | Three months ended June 30, |  |
Components of AOCI |  | 2019 |  | 2018 |  | Condensed Consolidated Statements of Income locations
Cash flow hedges: |  |  |  |  |  |
Foreign currency contract gains (losses) |  | $ | 22 |  |  | $ | (20 | ) |  | Product sales
Cross-currency swap contract gains (losses) |  | 14 |  |  | (298 | ) |  | Interest and other income, net
|  | 36 |  |  | (318 | ) |  | Income before income taxes
|  | (8 | ) |  | 68 |  |  | Provision for income taxes
|  | $ | 28 |  |  | $ | (250 | ) |  | Net income
Available-for-sale securities: |  |  |  |  |  |
Net realized losses |  | $ | (2 | ) |  | $ | (115 | ) |  | Interest and other income, net
|  | — |  |  | 1 |  |  | Provision for income taxes
|  | $ | (2 | ) |  | $ | (114 | ) |  | Net income
|  | Six months ended June 30, |  |
Components of AOCI |  | 2019 |  | 2018 |  | Condensed Consolidated Statements of Income locations
Cash flow hedges: |  |  |  |  |  |
Foreign currency contract gains (losses) |  | $ | 36 |  |  | $ | (54 | ) |  | Product sales
Cross-currency swap contract losses |  | (28 | ) |  | (134 | ) |  | Interest and other income, net
|  | 8 |  |  | (188 | ) |  | Income before income taxes
|  | (2 | ) |  | 40 |  |  | Provision for income taxes
|  | $ | 6 |  |  | $ | (148 | ) |  | Net income
Available-for-sale securities: |  |  |  |  |  |
Net realized losses |  | $ | (6 | ) |  | $ | (249 | ) |  | Interest and other income, net
|  | — |  |  | 2 |  |  | Provision for income taxes
|  | $ | (6 | ) |  | $ | (247 | ) |  | Net income

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