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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Employee Stock Purchase Plan
The following table summarizes shares sold to employees under the 2013 Plan and the prior plan in the years ended December 31, 2013, 2012 and 2011.
Plan
2013
 
2012
 
2011
Cumulative Shares Issued in 2013
Weighted Average Fair Value 2013
2013 Employee Stock Purchase Plan
51,462

 
—

 
—

51,462

$
22.64

2003 Employee Stock Purchase Plan
26,170

 
102,498

 
68,630

1,200,000

$
17.01

Total shares sold to employees
77,632

 
102,498

 
68,630

 
 
Employee Stock Option Plan
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Weighted-Average Assumptions
The fair value of each option grant in the Employee Stock Option Plan was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions for the indicated periods: 
 
2013
 
2012

2011
Dividend yield (1)
2.6
%
 
2.7
%
 
2.7
%
Expected volatility (2)
44.7
%
 
45.5
%
 
41.6
%
Risk-free interest rate (3)
1.3
%
 
0.8
%
 
1.4
%
Expected term of options (in years) (4)
4.0

 
4.1

 
4.2

Weighted-average grant-date fair value
$
7

 
$
6

 
$
8


(1)    Represents the Company's estimated cash dividend yield over the expected term of option grant.
(2)
Amount is determined based on analysis of historical price volatility of the Company's common stock. The expected volatility is based on the daily percentage change in the price of the stock over a period equal to the expected term of the option grant.
(3)    Represents the U.S. Treasury yield over the expected term of the option grant.
(4)
Represents the period of time that options granted are expected to be outstanding. Based on analysis of historical option exercise activity, the Company has determined that all employee groups exhibit similar exercise and post-vesting termination behavior.
Summary of Stock Option Activity
A summary of the status of the Company’s employee stock option plan at December 31, 2013, 2012 and 2011, and changes during the same periods are presented in the tables and narrative below: 


 
2013
 
Shares
(000)
 
Wtd. Avg.
Ex. Price
 
Wtd. Avg. 
Remaining
Contract Life
 
Aggregate
Intrinsic 
Value
(000)
Outstanding at Beginning of Year
8,861

 
$
21

 
 
 
 
Granted
2,731

 
25

 
 
 
 
Exercised
(2,225
)
 
16

 
 
 
$
20,884

Forfeited
(367
)
 
23

 
 
 
 
Outstanding at End of Year
9,000

 
23

 
3.4 Yrs
 
$
85,633

Exercisable at End of Year
2,745

 
$
23

 
2.3 Yrs
 
$
28,302


 
2012
 
Shares
(000)
 
Wtd. Avg.
Ex. Price
 
Wtd. Avg. 
Remaining
Contract Life
 
Aggregate
Intrinsic 
Value
(000)
Outstanding at Beginning of Year
7,555

 
$
21

 
 
 
 
Granted
2,641

 
20

 
 
 
 
Exercised
(689
)
 
15

 
 
 
$
3,810

Forfeited
(646
)
 
21

 
 
 
 
Outstanding at End of Year
8,861

 
21

 
3.4 Yrs
 
$
11,730

Exercisable at End of Year
3,003

 
$
19

 
2.2 Yrs
 
$
7,617


 
 
2011
 
Shares
(000)
 
Wtd. Avg.
Ex. Price
 
Wtd. Avg. 
Remaining
Contract Life
 
Aggregate
Intrinsic 
Value
(000)
Outstanding at Beginning of Year
6,805

 
$
17

 
 
 
 
Granted
2,462

 
29

 
 
 
 
Exercised
(1,497
)
 
16

 
 
 
$
20,659

Forfeited
(215
)
 
19

 
 
 
 
Outstanding at End of Year
7,555

 
21

 
3.5 Yrs
 
$
66,295

Exercisable at End of Year
2,024

 
$
17

 
2.3 Yrs
 
$
26,218
Schedule of Non-Vested Stock Option Activity
A summary of the status of the Company’s non-vested employee stock option activity for the years ended December 31, 2013, 2012, and 2011, are presented in the table and narrative below: 
 
2013
 
2012
 
2011
 
Shares
(000)
 
Wtd. Avg
Grant
Date
Fair Value
 
Shares
(000)
 
Wtd. Avg
Grant
Date
Fair Value
 
Shares
(000)
 
Wtd. Avg
Grant
Date
Fair Value
Nonvested Stock Options at Beginning of Year
5,858

 
$
6

 
5,530

 
$
6

 
5,038

 
$
5

Granted
2,731

 
7

 
2,641

 
6

 
2,462

 
8

Vested
(2,022
)
 
6

 
(1,936
)
 
5

 
(1,766
)
 
5

Forfeited
(313
)
 
7

 
(377
)
 
6

 
(204
)
 
5

Nonvested Stock Options at End of Year
6,254

 
$
7

 
5,858

 
$
6

 
5,530

 
$
6
Non-Employee Director Stock Option Plan
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Weighted-Average Assumptions
The fair value of each option grant in the Non-employee Director Stock Option Plans was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions for the indicated periods:
 
 
2013
 
2012
 
2011
Dividend yield (1)
2.7
%
 
2.6
%
 
2.7
%
Expected volatility (2)
45.9
%
 
44.5
%
 
40.5
%
Risk-free interest rate (3)
1.9
%
 
1.7
%
 
3.2
%
Expected term of options (in years) (4)
7.0

 
6.8

 
6.5

Weighted-average grant-date fair value
$
9

 
$
8

 
$
11


(1)    Represents the Company's estimated cash dividend yield over the expected term of option grant.
(2)
Amount is determined based on analysis of historical price volatility of the Company's common stock. The expected volatility is based on the daily percentage change in the price of the stock over a period equal to the expected term of the option grant.
(3)    Represents the U.S. Treasury yield over the expected term of the option grant.
(4)
Represents the period of time that options granted are expected to be outstanding. Based on analysis of historical option exercise activity, the Company has determined that non-employee directors exhibit similar exercise and post-vesting termination behavior.
Summary of Stock Option Activity
A summary of the status of the Company’s Non-employee Director Stock Option Plan at December 31, 2013, 2012, and 2011, and changes during the same periods are presented in the tables and narrative below: 
 
2013
 
Shares
(000)
 
Wtd. Avg.
Ex. Price
 
Wtd. Avg. 
Remaining
Contract Life
 
Aggregate
Intrinsic 
Value
(000)
Outstanding at Beginning of Year
234

 
$
21

 
 
 
 
Granted
42

 
25

 
 
 
 
Exercised
(45
)
 
20

 
 
 
$
300

Forfeited
—

 
—

 
 
 
 
Outstanding at End of Year
231

 
22

 
6.4 Yrs
 
$
2,491

Exercisable at End of Year
231

 
$
22

 
6.4 Yrs
 
$
2,491




 
2012
 
Shares
(000)
 
Wtd. Avg.
Ex. Price
 
Wtd. Avg. 
Remaining
Contract Life
 
Aggregate
Intrinsic 
Value
(000)
Outstanding at Beginning of Year
192

 
$
21

 
 
 
 
Granted
42

 
22

 
 
 
 
Exercised
—

 
—

 
 
 


Forfeited
—

 
—

 
 
 
 
Outstanding at End of Year
234

 
21

 
6.4 Yrs
 
$
225

Exercisable at End of Year
234

 
$
21

 
6.4 Yrs
 
$
225


 
 
2011
 
Shares
(000)
 
Wtd. Avg.
Ex. Price
 
Wtd. Avg. 
Remaining
Contract Life
 
Aggregate
Intrinsic 
Value
(000)
Outstanding at Beginning of Year
244

 
$
18

 
 
 
 
Granted
42

 
32

 
 
 
 
Exercised
(94
)
 
17

 
 
 
$
1,362

Forfeited
—

 
—

 
 
 
 
Outstanding at End of Year
192

 
21

 
6.8 Yrs
 
$
1,740

Exercisable at End of Year
192

 
$
21

 
6.8 Yrs
 
$
1,740

 
Schedule of Non-Vested Stock Option Activity
A summary of the status of the Company’s non-vested Non-employee Director Stock Option Plan activity for the years ended December 31, 2013, 2012, and 2010, are presented in the table and narrative below:
 
 
2013
 
2012
 
2011
 
Shares
(000)
 
Wtd. Avg
Grant Date
Fair Value
 
Shares
(000)
 
Wtd. Avg
Grant Date
Fair Value
 
Shares
(000)
 
Wtd. Avg
Grant Date
Fair Value
Nonvested stock options at Beginning of Year
—

 
$
—

 
—

 
$
—

 
—

 
$
—

Granted
42

 
9

 
42

 
8

 
42

 
11

Vested
(42
)
 
9

 
(42
)
 
8

 
(42
)
 
11

Forfeited


 


 
—

 
—

 
—

 
—

Nonvested stock options at End of Year
—

 
$
—

 
—

 
$
—

 
—

 
$
—