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Stockholders' equity (Tables)
 12 Months Ended
Dec. 31, 2012
Equity [Abstract]  
Summary of activity under our stock repurchase program
Activity under our stock repurchase program was as follows for the years ended December 31, 2012, 2011 and 2010 (in millions):
 
2012
 
2011
 
2010
 
Shares
 
Dollars
 
Shares
 
Dollars
 
Shares
 
Dollars
First quarter
21.0

 
$
1,429

 
—

 
$
—

 
29.1

 
$
1,684

Second quarter
17.4

 
1,203

 
12.9

 
732

 
10.3

 
616

Third quarter
9.7

 
797

 
45.4

 
2,421

 
6.6

 
364

Fourth quarter
14.2

 
1,233

 
86.0

 
5,154

(1) 
20.5

 
1,136

Total stock repurchases
62.3
 
$
4,662

 
144.3

 
$
8,307

 
66.5

 
$
3,800

___________
(1)
Includes the repurchase of 83.3 million shares of our common stock at an average price paid per share of $60.08, including related expenses, for an aggregate cost of $5.0 billion, under a modified Dutch auction tender offer.
Components of Accumulated Other Comprehensive Income
The components of Accumulated other comprehensive income (AOCI) are as follows for the years ended December 31, 2012, 2011 and 2010 (in millions):
 
Foreign
currency
translation
 
Cash flow
hedges
 
Available-for-sale
securities
 
Other
 
AOCI
Balance as of December 31, 2009
$
40

 
$
(82
)
 
$
95

 
$
(8
)
 
$
45

Foreign currency translation adjustments
(29
)
 
—

 
—

 
—

 
(29
)
Unrealized gains
—

 
186

 
155

 
1

 
342

Reclassification adjustments to income
—

 
(46
)
 
(90
)
 
—

 
(136
)
Income taxes
11

 
(55
)
 
(25
)
 
—

 
(69
)
Balance as of December 31, 2010
22

 
3

 
135

 
(7
)
 
153

Foreign currency translation adjustments
(6
)
 
—

 
—

 
—

 
(6
)
Unrealized (losses) gains
—

 
(51
)
 
125

 
2

 
76

Reclassification adjustments to income
—

 
112

 
(154
)
 
—

 
(42
)
Other
—

 
—

 
—

 
(8
)
 
(8
)
Income taxes
5

 
(21
)
 
14

 
—

 
(2
)
Balance as of December 31, 2011
21

 
43

 
120

 
(13
)
 
171

Foreign currency translation adjustments
(13
)
 
—

 
—

 
—

 
(13
)
Unrealized (losses) gains
—

 
15

 
233

 
(1
)
 
247

Reclassification adjustments to income
—

 
(134
)
 
(132
)
 
—

 
(266
)
Income taxes
4

 
41

 
(38
)
 
—

 
7

Balance as of December 31, 2012
$
12

 
$
(35
)
 
$
183

 
$
(14
)
 
$
146