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Stockholders' equity (Tables)
 6 Months Ended
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