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Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2011
Compensation Plans [Abstract]  
Schedule of Assumptions Used in Calculating the Fair Value of Stock Options
    
2011
2010
2009
Dividend yield
3.2
%
4.9
%
7.0
%
Volatility
33.26
%
32.44
%
27.61
%
Risk-free interest rate
2.3
%
2.6
%
2.5
%
Expected life (years)
5.3

5.3

5.3
Schedule of Stock Option Awards
 
Number of
Shares
(in thousands)
Weighted
Average
Exercise Price
(per share)
Weighted
Average
Remaining
Contractual
Term (years)
Aggregate
Intrinsic
Value
(in thousands)
Outstanding, December 31, 2010
62,887

$
38.83

 

 

Granted
3,739

$
51.85

 

 

Exercised
(20,677
)
$
41.85

 

 

Forfeited
(88
)
$
35.14

 

 

Cancelled
(815
)
$
46.29

 

 

Outstanding, December 31, 20111
45,046

$
38.40

2.68

$
381,386

Exercisable, December 31, 2011
32,020

$
39.88

1.75

$
214,349


1. 
Includes 5.4 million options outstanding from the 2002 Corporate Sharing Program grants of 200 shares to all eligible employees at an option price of $44.50. These options expired in January 2012.
Schedule of Restricted Stock Awards
 
Number of
Shares
(in thousands)
Weighted
Average
Grant Date
Fair Value
(per share)
Nonvested, December 31, 2010
4,118

$
32.27

Granted
1,545

$
53.19

Vested
(1,998
)
$
36.92

Forfeited
(84
)
$
37.53

Nonvested, December 31, 2011
3,581

$
38.58