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Equity-Based Compensation Summary of Restricted Stock Units (Tables)
 12 Months Ended
Dec. 31, 2012
Summary of stock options  
Summary of the RSU activity
A summary of the RSU activity for 2012 follows:
(Restricted stock units in millions)
Number of restricted
stock units
 
Weighted-average fair
value per award
Non-vested at January 1
4.8

 
$
33.02

Granted
1.5

 
49.41

Vested
(2.7
)
 
25.91

Forfeited
(0.2
)
 
40.41

Non-vested at December 31
3.4

 
$
42.47
Schedule Of Share Based Compensation Information related Restricted Stock Units Activity [Table Text Block]
Information related to RSUs follows:
 
2012
 
2011
 
2010
Pretax expense for RSUs
$
46

 
$
50

 
$
39

After-tax expense for RSUs
30

 
32

 
25
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
A summary of the assumptions used in determining the fair value of stock options follows:
 
2012
 
2011
 
2010
Expected volatility
35
%
 
33
%
 
31
%
Expected option life in years
5.5


5.5

 
5.5

Expected dividend yield
2.0
%
 
2.0
%
 
2.0
%
Risk-free interest rate
1.0 to .0.9%

 
2.2% to 1.4%

 
2.4% to 1.3%

Weighted-average fair value of stock options granted
$
14.08

 
$
14.56

 
$
8.98
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of stock option activity follows:
(Options in millions)
Weighted-average
price per option
 
Options
 
Weighted-average
remaining
contractual life
in years
 
Aggregate
intrinsic
value
Outstanding at January 1, 2012
$
36.84

 
13.1

 
 
 
 
Granted
51.77

 
0.8

 
 
 
 
Exercised
31.34

 
(3.0
)
 
 
 
 
Forfeited and canceled
51.21

 
(0.1
)
 
 
 
 
Outstanding at December 31, 2012
$
39.45

 
10.8

 
4.2
 
$
158

 
 
 
 
 
 
 
 
Exercisable at December 31, 2012
$
37.78

 
9.5

 
3.6
 
$
155

Reserved for future grants at December 31, 2012
 
 
21.0

 
 
 
 
Share Based Compensation Arrangement By Share Based Payment Award Information related to stock options [Table Text Block]
Information related to stock options follows:
 
2012
 
2011
 
2010
Pretax expense for stock options
$
7

 
$
5

 
$
11

After-tax expense for stock options
5

 
4

 
8

Proceeds from stock options exercised
95

 
71

 
157

Income tax benefit related to stock options exercised

 

 

Tax benefit classified in operating activities in the Consolidated
   Statements of Cash Flows
5

 
13

 
—

Excess tax benefit classified in financing activities in the
   Consolidated Statements of Cash Flows
13

 
33

 
—

Intrinsic value of stock options exercised
60

 
62

 
98

Total fair value of stock options vesting
$
7

 
$
5

 
$
11

 

 

 

Stock options exercised, in millions of options
3.099

 
2.541

 
6.096