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Stockholders' equity (Tables)
 6 Months Ended
Jun. 30, 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

Second quarter
18.2

 
3,190

 
6.2

 
1,006

   Total stock repurchases
74.6

 
$
13,977

 
9.6

 
$
1,561
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(1)
—

 
—

 
(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
)
Foreign currency translation adjustments
(111
)
 
—

 
—

 
—

 
(111
)
Unrealized losses
—

 
(34
)
 
(106
)
 
—

 
(140
)
Reclassification adjustments to income
—

 
318

 
115

 
—

 
433

Other
—

 
—

 
—

 
—

 
—

Income taxes
—

 
(61
)
 
—

 
—

 
(61
)
Balance as of June 30, 2018
$
(611
)
 
$
223

 
$
(487
)
 
$
2

 
$
(873
)

____________ 
(1) 
See Note 1, Summary of significant accounting policies, for additional information regarding the adoption on January 1, 2018, of the new accounting standard related to the classification and measurement of financial instruments and the related cumulative effect from the change in accounting principle.
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
 
2018
 
2017
 
Condensed Consolidated
Statements of Income locations
Cash flow hedges:
 
 
 
 
 
 
  Foreign currency contract (losses) gains
 
$
(20
)
 
$
33

 
Product sales
  Cross-currency swap contract (losses) gains
 
(298
)
 
297

 
Interest and other income, net
 
 
(318
)
 
330

 
Income before income taxes
 
 
68

 
(117
)
 
Provision for income taxes
 
 
$
(250
)
 
$
213

 
Net income
Available-for-sale securities:
 
 
 
 
 
 
  Net realized losses
 
$
(115
)
 
$
(47
)
 
Interest and other income, net
 
 
1

 
(2
)
 
Provision for income taxes
 
 
$
(114
)
 
$
(49
)
 
Net income
 
 
Six months ended
June 30,
 
 
Components of AOCI
 
2018
 
2017
 
Condensed Consolidated
Statements of Income locations
Cash flow hedges:
 
 
 
 
 
 
  Foreign currency contract (losses) gains
 
$
(54
)
 
$
90

 
Product sales
  Cross-currency swap contract (losses) gains
 
(134
)
 
371

 
Interest and other income, net
 
 
(188
)
 
461

 
Income before income taxes
 
 
40

 
(164
)
 
Provision for income taxes
 
 
$
(148
)
 
$
297

 
Net income
Available-for-sale securities:
 
 
 
 
 
 
  Net realized losses
 
$
(249
)
 
$
(96
)
 
Interest and other income, net
 
 
2

 
(2
)
 
Provision for income taxes
 
 
$
(247
)
 
$
(98
)
 
Net income