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Stockholders' equity (Tables)
 9 Months Ended
Sep. 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

Third quarter
8.7

 
1,713

 
4.4

 
769

   Total stock repurchases
83.4

 
$
15,690

 
14.0

 
$
2,330


* Total shares may not add due to rounding.
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

Income taxes
—

 
(61
)
 
—

 
—

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

 
(487
)
 
2

 
(873
)
Foreign currency translation adjustments
(71
)
 
—

 
—

 
—

 
(71
)
Unrealized gains (losses)
—

 
19

 
(7
)
 
—

 
12

Reclassification adjustments to income
—

 
33

 
103

 
—

 
136

Other
—

 
—

 
—

 
(3
)
 
(3
)
Income taxes
—

 
(11
)
 
1

 
—

 
(10
)
Balance as of September 30, 2018
$
(682
)
 
$
264

 
$
(390
)
 
$
(1
)
 
$
(809
)

____________ 
(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
September 30,
 
 
Components of AOCI
 
2018
 
2017
 
Condensed Consolidated
Statements of Income locations
Cash flow hedges:
 
 
 
 
 
 
  Foreign currency contract gains (losses)
 
$
3

 
$
(2
)
 
Product sales
  Cross-currency swap contract (losses) gains
 
(36
)
 
143

 
Interest and other income, net
  Forward interest rate contract losses
 
—

 
(1
)
 
Interest expense, net
 
 
(33
)
 
140

 
Income before income taxes
 
 
7

 
(49
)
 
Provision for income taxes
 
 
$
(26
)
 
$
91

 
Net income
Available-for-sale securities:
 
 
 
 
 
 
  Net realized (losses) gains
 
$
(103
)
 
$
26

 
Interest and other income, net
 
 
1

 
(5
)
 
Provision for income taxes
 
 
$
(102
)
 
$
21

 
Net income
 
 
Nine months ended
September 30,
 
 
Components of AOCI
 
2018
 
2017
 
Condensed Consolidated
Statements of Income locations
Cash flow hedges:
 
 
 
 
 
 
  Foreign currency contract (losses) gains
 
$
(51
)
 
$
88

 
Product sales
  Cross-currency swap contract (losses) gains
 
(170
)
 
514

 
Interest and other income, net
  Forward interest rate contract losses
 
—

 
(1
)
 
Interest expense, net
 
 
(221
)
 
601

 
Income before income taxes
 
 
47

 
(213
)
 
Provision for income taxes
 
 
$
(174
)
 
$
388

 
Net income
Available-for-sale securities:
 
 
 
 
 
 
  Net realized losses
 
$
(352
)
 
$
(70
)
 
Interest and other income, net
 
 
3

 
(7
)
 
Provision for income taxes
 
 
$
(349
)
 
$
(77
)
 
Net income