Stock-based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation [Abstract]  
Restricted Stock Activity Disclosure
Restricted stock activity was as follows: 
 
Shares
(in thousands)
 
Weighted-Average
Grant Date
Fair Value

Outstanding at December 31, 2009
5,593

 
$
51.78

Granted
1,932

 
52.37

Vested
(1,697
)
 
54.02

Forfeited
(385
)
 
51.62

Outstanding at December 31, 2010
5,443

 
51.30

Granted
2,089

 
49.63

Vested
(1,701
)
 
52.25

Forfeited
(292
)
 
51.25

Outstanding at December 31, 2011
5,539

 
50.38

Granted
2,370

 
50.38

Vested
(1,733
)
 
51.78

Forfeited
(338
)
 
50.07

Outstanding at December 31, 2012
5,838

 
$
49.98
Long-Term Performance Plan Activity
LTPP activity related to the expected units was as follows: 
 
Units
(in thousands)
 
Weighted-Average
Grant Date
Fair Value

Outstanding at December 31, 2009
1,661

 
$
57.65

Granted
439

 
55.74

Decrease
(194
)
 
56.21

Vested
(746
)
 
53.33

Forfeited
(88
)
 
53.39

Outstanding at December 31, 2010
1,072

 
50.34

Granted
458

 
52.33

Decrease
(66
)
 
57.83

Vested
(473
)
 
74.79

Outstanding at December 31, 2011
991

 
50.07

Granted
484

 
50.83

Increase
407

 
53.32

Vested
(462
)
 
46.04

Outstanding at December 31, 2012
1,420

 
$
52.57
Stock Option Activity Plan
Stock option activity was as follows: 
 
Shares
(in thousands)
 
Weighted-
Average
Option Price

 
Weighted-
Average
Remaining
Contractual
Term
(in years)

 
Aggregate
Intrinsic
Value
(in millions)

Outstanding at December 31, 2009
8,732

 
$
35.28

 
2.3

 
$
142

Exercised
(2,167
)
 
30.15

 
 
 
 
Forfeited or expired
(115
)
 
24.40

 
 
 
 
Outstanding at December 31, 2010
6,450

 
37.23

 
1.5

 
59

Exercised
(1,867
)
 
33.73

 
 
 
 
Forfeited or expired
(185
)
 
30.85

 
 
 
 
Outstanding at December 31, 2011
4,398

 
38.98

 
0.8

 
41

Exercised
(3,238
)
 
40.61

 
 
 
 
Forfeited or expired
(271
)
 
44.00

 
 
 
 
Outstanding at December 31, 2012
889

 
$
31.56

 
0.5

 
$
23

Exercisable at December 31, 2012
889

 
$
31.56

 
0.5

 
$
23
Schedule of Stock Option Outstanding and Exercisable
The following table summarizes information about stock options outstanding and exercisable at December 31, 2012: 
Exercise Price Range
Shares
(in thousands)
 
Weighted- Average
Remaining Contractual
Life (in years)

 
Weighted-
Average
Exercise
Price

27.29 to 30.50
50

 
0.6

 

$28.93

30.51 to 31.55
762

 
0.4

 

$31.44

31.56 to 41.50
77

 
1.6

 

$34.41

Total
889

 
0.5

 

$31.56