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Stockholders' equity (Tables)
 3 Months Ended
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