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Stockholders' equity (Tables)
 12 Months Ended
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