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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Stock Incentive Plans [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
The following table summarizes information about the RSUs under our stock incentive plans (RSUs in millions):
 
Shares
 
Weighted-Average Grant Date Fair Value
 
Weighted-Average Remaining Contractual Term
RSUs outstanding at December 31, 2011
22.5

 
$
23.01

 
1.1
Granted
9.1

 
$
25.10

 
 
Settled
(3.2
)
 
$
27.71

 
 
Forfeited or expired
(1.5
)
 
$
24.42

 
 
RSUs outstanding at December 31, 2012
26.9

 
$
23.06

 
0.7
RSUs unvested and expected to vest at December 31, 2012
16.2

 
$
23.49

 
1.0
RSUs vested and payable at December 31, 2012
10.3

 
$
22.27

 
—
RSUs granted in the year ended December 31, 2011
 
 
$
31.18

 
 
RSUs granted in the year ended December 31, 2010
 
 
$
19.17

 
 
Schedule of Compensation Expense [Table Text Block]
The following table summarizes compensation expense recorded for our stock incentive plans (dollars in millions):
 
Years Ended December 31,
 
2012
 
2011
 
2010
Compensation expense
$
302

 
$
233

 
$
235

Income tax benefit
$
100

 
$
—

 
$
—