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Employee Stock Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table reports restricted stock activity during the year ended December 31, 2012:

Shares in thousands
 
Number of Shares
 
Weighted Average Grant-Date Fair Value per Share
Unvested shares as of January 1
 
5,384

 
$
15.22

Shares granted
 
2,427

 
$
19.59

Shares vested
 
(2,854
)
 
$
12.39

Shares forfeited
 
(237
)
 
$
18.04

Unvested shares as of December 31
 
4,720

 
$
19.02


The total intrinsic value of shares vested and distributed was $68 million in 2012, $1 million in 2011, and $9 million in 2010. As of December 31, 2012, there was $47 million of unrecognized compensation cost related to unvested restricted stock grants. The unrecognized compensation cost is expected to be recognized over a remaining weighted-average period of 1.6 years.

The following table represents the composition of restricted stock grants in 2012:

Shares in thousands
 
Number of Shares
 
Weighted Average Grant-Date Fair Value
Service-based shares
 
660

 
$
21.59

Performance-based shares
 
1,767

 
$
18.85

Total restricted stock grants
 
2,427

 
$
19.59
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
As of December 31, 2012, the Company’s primary types of stock-based compensation were restricted stock and stock options. The Company recorded stock-based compensation expense, the components of which are further described below, for the years ended December 31 as follows:

In millions
 
2012
 
2011
 
2010
Restricted stock
 
$
46

 
$
27

 
$
15

Stock options
 
3

 
6

 
6

Total stock-based compensation (pre-tax)
 
49

 
33

 
21

Tax benefit
 
(14
)
 
(10
)
 
(7
)
Total stock-based compensation (net of tax)
 
$
35

 
$
23

 
$
14
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The weighted average fair value of options granted was estimated based on the below weighted average assumptions and was $8.24 per share in 2012, $7.38 per share in 2011, and $5.49 per share in 2010.
 
 
2012
 
2011
 
2010
Dividend yield
 
—

 
—

 
—

Risk-free interest rate
 
0.78
%
 
2.04
%
 
2.27
%
Expected volatility
 
40.1
%
 
40.4
%
 
46.8
%
Expected holding period (years)
 
5.0

 
5.1

 
4.8
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes the Company’s stock option activity for the year ended December 31, 2012:

Shares in thousands
 
Shares Under Option
 
Weighted Average Exercise Price per Share
 
Weighted Average Remaining Contractual Term (in years)
 
Aggregate Intrinsic Value
(in millions)
Outstanding as of January 1
 
8,156

 
$
16.23

 
 
 
 
Granted
 
65

 
$
23.06

 
 
 
 
Exercised
 
(3,264
)
 
$
14.45

 
 
 
 
Forfeited or expired
 
(99
)
 
$
17.55

 
 
 
 
Outstanding as of December 31
 
4,858

 
$
17.49

 
4.34
 
$
38

Fully vested and expected to vest as of December 31
 
4,799

 
$
17.53

 
4.47
 
$
37

Exercisable as of December 31
 
4,168

 
$
18.05

 
3.85
 
$
30