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Stockholders' equity (Tables) | 3 Months Ended
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Mar. 31, 2018
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):
| 2018 |  | 2017
| Shares |  | Dollars |  | Shares |  | Dollars
First quarter | 56.4 |  |  | $ | 10,787 |  |  | 3.4 |  |  | $ | 555 |
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, 2017 | $ | (529 | ) |  | $ | (6 | ) |  | $ | (144 | ) |  | $ | — |  |  | $ | (679 | )
Cumulative effect of change in accounting principle, net of tax | — |  |  | — |  |  | (9 | ) |  | — |  |  | (9 | )
Foreign currency translation adjustments | 29 |  |  | — |  |  | — |  |  | — |  |  | 29 |
Unrealized gains (losses) | — |  |  | 149 |  |  | (482 | ) |  | — |  |  | (333 | )
Reclassification adjustments to income | — |  |  | (130 | ) |  | 134 |  |  | — |  |  | 4 |
Other | — |  |  | — |  |  | — |  |  | 2 |  |  | 2 |
Income taxes | — |  |  | (13 | ) |  | 5 |  |  | — |  |  | (8 | )
Balance as of March 31, 2018 | $ | (500 | ) |  | $ | — |  |  | $ | (496 | ) |  | $ | 2 |  |  | $ | (994 | )
Reclassifications out of accumulated other comprehensive income | The reclassifications out of AOCI and into earnings were as follows (in millions):
|  | Three months ended March 31, |  |
Components of AOCI |  | 2018 |  | 2017 |  | Condensed Consolidated Statements of Income location
Cash flow hedges: |  |  |  |  |  |
Foreign currency contract (losses) gains |  | $ | (34 | ) |  | $ | 57 |  |  | Product sales
Cross-currency swap contract gains |  | 164 |  |  | 74 |  |  | Interest and other income, net
|  | 130 |  |  | 131 |  |  | Income before income taxes
|  | (28 | ) |  | (47 | ) |  | Provision for income taxes
|  | $ | 102 |  |  | $ | 84 |  |  | Net income
Available-for-sale securities: |  |  |  |  |  |
Net realized losses |  | $ | (134 | ) |  | $ | (49 | ) |  | Interest and other income, net
|  | 1 |  |  | — |  |  | Provision for income taxes
|  | $ | (133 | ) |  | $ | (49 | ) |  | Net income

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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