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Stockholders' equity | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Stockholders' equity | Stockholders’ equity 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 |
As of December 31, 2017, $4.4 billion remained available under our stock repurchase program. In January 2018, our Board of Directors authorized an additional $10.0 billion under our stock repurchase program. On February 5, 2018, we announced a tender offer to purchase up to $10.0 billion of our common stock at a price not greater than $200 per share nor less than $175 per share. The tender offer expires at 12:00 Midnight, New York City time, at the end of Monday, March 5, 2018, unless the offer is extended. Dividends Our Board of Directors declared quarterly dividends per share of $1.15, $1.00 and $0.79 that were paid in each of the four quarters of 2017, 2016, and 2015, respectively. Historically, each year we have declared dividends in December that were paid in the first quarter of the following fiscal year, and in March, July and October that were paid in the second, third and fourth quarters, respectively, of the same fiscal year. Additionally, on December 12, 2017, the Board of Directors declared a quarterly cash dividend of $1.32 per share of common stock, which will be paid on March 8, 2018, to all stockholders of record as of the close of business on February 15, 2018. Accumulated other comprehensive income (loss) 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 | )
With respect to the table above, income tax expenses or benefits for unrealized gains and losses and the related reclassification adjustments to income for cash flow hedges were a $68 million expense and $226 million benefit in 2017, a $68 million benefit and $46 million expense in 2016 and a $53 million expense and $53 million benefit in 2015, respectively. Income tax expenses or benefits for unrealized gains and losses and the related reclassification adjustments to income for available-for-sale securities were a $9 million expense and $8 million benefit for 2017, a $9 million benefit and $11 million expense in 2016 and a $0 million benefit and $18 million expense in 2015, respectively. 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
Other In addition to common stock, our authorized capital includes 5 million shares of preferred stock, $0.0001 par value. As of December 31, 2017 and 2016, no shares of preferred stock were issued or outstanding.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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