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Stockholders' equity (Tables)
 6 Months Ended
Jun. 30, 2013
Equity [Abstract]  
Summary of activity under our stock repurchase program
Activity under our stock repurchase program was as follows (in millions):
 
2013
 
2012
 
Shares    
 
Dollars    
 
Shares    
 
Dollars    
First quarter
9.1
 
$
771

 
21.0
 
$
1,429

Second quarter
—

 
—

 
17.4

 
1,203

Total stock repurchases
9.1

 
$
771

 
38.4

 
$
2,632
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, 2012
$
12

 
$
(35
)
 
$
183

 
$
(14
)
 
$
146

Foreign currency translation adjustments
(36
)
 
—

 
—

 
—

 
(36
)
Unrealized gains (losses)
—

 
(25
)
 
(32
)
 
1

 
(56
)
Reclassification adjustments to income
—

 
144

 
(67
)
 
—

 
77

Income taxes
13

 
(44
)
 
37

 
—

 
6

Balance as of March 31, 2013
$
(11
)
 
$
40

 
$
121

 
$
(13
)
 
$
137

Foreign currency translation adjustments
(39
)
 
—

 
—

 
—

 
(39
)
Unrealized gains (losses)
—

 
53

 
(318
)
 
—

 
(265
)
Reclassification adjustments to income
—

 
(18
)
 
(7
)
 
—

 
(25
)
Income taxes
14

 
(13
)
 
120

 
—

 
121

Balance as of June 30, 2013
$
(36
)
 
$
62

 
$
(84
)
 
$
(13
)
 
$
(71
)
Reclassifications out of Accumulated Other Comprehensive Income
The reclassifications out of AOCI to Net income were as follows (in millions):
 
 
Amounts reclassified out of AOCI
 
 

 
Three months ended
 
Six months ended
 
Net Income
Components of AOCI
 
June 30, 2013
 
June 30, 2013
 
Line Item Affected
Cash flow hedges:
 
 
 
 
 
 
     Foreign currency contract gains
 
$
7

 
$
3

 
Product sales
     Cross-currency swap contract gains (losses)
 
12

 
(128
)
 
Interest and other income, net
     Forward interest rate contract losses
 
(1
)
 
(1
)
 
Interest expense, net
 
 
18

 
(126
)
 
Total before income tax
 
 
(7
)
 
46

 
Tax (expense)/benefit
 
 
$
11

 
$
(80
)
 
Net of taxes
Available-for-sale securities:
 
 
 

 

     Net realized gains
 
$
7

 
$
74

 
Interest and other income, net
 
 
(3
)
 
(28
)
 
Tax (expense)/benefit
 
 
$
4

 
$
46

 
Net of taxes