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Stockholders' equity (Tables) | 9 Months Ended
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Sep. 30, 2021
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):
| 2021 |  | 2020
| Shares |  | Dollars |  | Shares |  | Dollars
First quarter | 3.7 |  |  | $ | 865 |  |  | 4.3 |  |  | $ | 933 |
Second quarter | 6.5 |  |  | 1,592 |  |  | 2.6 |  |  | 591 |
Third quarter | 4.6 |  |  | 1,069 |  |  | 3.0 |  |  | 752 |
Total stock repurchases | 14.8 |  |  | $ | 3,526 |  |  | 9.9 |  |  | $ | 2,276 |
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, 2020 | $ | (709) |  |  | $ | (263) |  |  | $ | 1 |  |  | $ | (14) |  |  | $ | (985) |
Foreign currency translation adjustments | (39) |  |  | — |  |  | — |  |  | — |  |  | (39) |
Unrealized gains | — |  |  | 108 |  |  | — |  |  | — |  |  | 108 |
Reclassification adjustments to income | — |  |  | 133 |  |  | — |  |  | — |  |  | 133 |
Other | — |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Income taxes | — |  |  | (51) |  |  | — |  |  | — |  |  | (51) |
Balance as of March 31, 2021 | (748) |  |  | (73) |  |  | 1 |  |  | (13) |  |  | (833) |
Foreign currency translation adjustments | 14 |  |  | — |  |  | — |  |  | — |  |  | 14 |
Unrealized losses | — |  |  | (31) |  |  | — |  |  | — |  |  | (31) |
Reclassification adjustments to income | — |  |  | (28) |  |  | — |  |  | — |  |  | (28) |
Other | — |  |  | — |  |  | — |  |  | (1) |  |  | (1) |
Income taxes | — |  |  | 11 |  |  | — |  |  | — |  |  | 11 |
Balance as of June 30, 2021 | (734) |  |  | (121) |  |  | 1 |  |  | (14) |  |  | (868) |
Foreign currency translation adjustments | (35) |  |  | — |  |  | — |  |  | — |  |  | (35) |
Unrealized gains (losses) | — |  |  | 16 |  |  | (1) |  |  | — |  |  | 15 |
Reclassification adjustments to income | — |  |  | 109 |  |  | — |  |  | — |  |  | 109 |
Other | — |  |  | — |  |  | — |  |  | (3) |  |  | (3) |
Income taxes | — |  |  | (26) |  |  | — |  |  | — |  |  | (26) |
Balance as of September 30, 2021 | $ | (769) |  |  | $ | (22) |  |  | $ | — |  |  | $ | (17) |  |  | $ | (808) |
Reclassifications out of accumulated other comprehensive income | Reclassifications out of AOCI and into earnings, including related income tax expenses, were as follows (in millions):
|  | Three months ended September 30, |  |
Components of AOCI |  | 2021 |  | 2020 |  | Condensed Consolidated Statements of Income locations
Cash flow hedges: |  |  |  |  |  |
Foreign currency contract (losses) gains |  | $ | (5) |  |  | $ | 41 |  |  | Product sales
Cross-currency swap contract (losses) gains |  | (104) |  |  | 183 |  |  | Other income, net
|  | (109) |  |  | 224 |  |  | Income before income taxes
|  | 23 |  |  | (49) |  |  | Provision for income taxes
|  | $ | (86) |  |  | $ | 175 |  |  | Net income
Available-for-sale securities: |  |  |  |  |  |
Net realized gains |  | $ | — |  |  | $ | — |  |  | Other income, net
|  | — |  |  | — |  |  | Provision for income taxes
|  | $ | — |  |  | $ | — |  |  | Net income
|  | Nine months ended September 30, |  |
Components of AOCI |  | 2021 |  | 2020 |  | Condensed Consolidated Statements of Income locations
Cash flow hedges: |  |  |  |  |  |
Foreign currency contract (losses) gains |  | $ | (24) |  |  | $ | 158 |  |  | Product sales
Cross-currency swap contract (losses) gains |  | (190) |  |  | 101 |  |  | Other income, net
|  | (214) |  |  | 259 |  |  | Income before income taxes
|  | 45 |  |  | (57) |  |  | Provision for income taxes
|  | $ | (169) |  |  | $ | 202 |  |  | Net income
Available-for-sale securities: |  |  |  |  |  |
Net realized gains |  | $ | — |  |  | $ | 33 |  |  | Other income, net
|  | — |  |  | (7) |  |  | Provision for income taxes
|  | $ | — |  |  | $ | 26 |  |  | Net income

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