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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Options Outstanding and Exercised Under Prior and Existing Stock Incentive Plans

The following is a summary of stock options outstanding and exercised under prior and existing stock incentive plans of the Company:

 

Year Ended December 31   Stock
Options/Shares
       Weighted-
Average
Exercise Price
       Weighted-Average
Remaining
Contractual Term
       Aggregate
Intrinsic Value
(in millions)
 

2015

                

Number outstanding at beginning of period

    33,649,198         $ 29.31             

Granted

    1,122,697           44.28             

Exercised

    (8,721,834        29.59             

Cancelled(a)

    (324,353        32.93             
 

 

 

 

Number outstanding at end of period(b)

    25,725,708         $ 29.82           3.6         $ 331   

Exercisable at end of period

    22,446,095         $ 28.68           3.0         $ 314   

2014

                

Number outstanding at beginning of period

    46,724,765         $ 29.12             

Granted

    1,246,451           40.32             

Exercised

    (13,851,590        29.59             

Cancelled(a)

    (470,428        31.12             
 

 

 

 

Number outstanding at end of period(b)

    33,649,198         $ 29.31           4.0         $ 526   

Exercisable at end of period

    28,923,260         $ 28.79           3.4         $ 467   

2013

                

Number outstanding at beginning of period

    63,171,918         $ 28.83             

Granted

    1,168,011           33.99             

Exercised

    (17,260,740        28.41             

Cancelled(a)

    (354,424        29.22             
 

 

 

 

Number outstanding at end of period(b)

    46,724,765         $ 29.12           4.4         $ 527   

Exercisable at end of period

    39,556,000         $ 29.19           3.8         $ 444   
(a) Options cancelled include both non-vested (i.e., forfeitures) and vested options.
(b) Outstanding options include stock-based awards that may be forfeited in future periods. The impact of the estimated forfeitures is reflected in compensation expense.
Weighted Average Estimated Fair Value of Stock Options Granted and Assumptions Utilized by Company for Newly Issued Grants

The following table includes the weighted average estimated fair value of stock options granted and the assumptions utilized by the Company for newly issued grants:

 

Year Ended December 31   2015      2014      2013  

Estimated fair value

  $ 12.23       $ 11.38       $ 12.13   

Risk-free interest rates

    1.7      1.7      1.0

Dividend yield

    2.6      2.6      2.6

Stock volatility factor

    .37         .38         .49   

Expected life of options (in years)

    5.5         5.5         5.5   
Summary of Certain Stock Option Activity

The following summarizes certain stock option activity of the Company:

 

Year Ended December 31 (Dollars in Millions)   2015        2014        2013  

Fair value of options vested

  $ 25         $ 33         $ 41   

Intrinsic value of options exercised

    130           171           144   

Cash received from options exercised

    257           408           489   

Tax benefit realized from options exercised

    50           66           56   
Stock Options Outstanding Additional Information

Additional information regarding stock options outstanding as of December 31, 2015, is as follows:

 

    Outstanding Options        Exercisable Options  
Range of Exercise Prices   Shares        Weighted-
Average
Remaining
Contractual
Life (Years)
       Weighted-
Average
Exercise
Price
       Shares        Weighted-
Average
Exercise
Price
 

$11.02 – $15.00

    2,664,092           3.1         $ 11.20           2,664,092         $ 11.20   

$15.01 – $20.00

    161,218           2.0           19.58           161,218           19.58   

$20.01 – $25.00

    2,051,039           4.2           23.85           2,051,039           23.85   

$25.01 – $30.00

    5,911,183           5.0           28.49           5,051,861           28.47   

$30.01 – $35.00

    9,215,909           2.6           32.21           8,719,854           32.11   

$35.01 – $40.00

    3,523,469           1.1           36.04           3,523,469           36.04   

$40.01 – $44.32

    2,198,798           8.6           42.32           274,562           40.32   

Total

    25,725,708           3.6         $ 29.82           22,446,095         $ 28.68
Summary of Company's Restricted Shares of Stock and Unit Awards

A summary of the status of the Company’s restricted shares of stock and unit awards is presented below:

 

    2015      2014      2013  
Year Ended December 31   Shares     

Weighted-

Average Grant-

Date Fair

Value

     Shares     

Weighted-

Average Grant-

Date Fair

Value

     Shares     

Weighted-

Average Grant-

Date Fair

Value

 

Outstanding at beginning of period

    7,921,571       $ 34.09         8,653,859       $ 29.96         8,935,743       $ 25.04   

Granted

    2,897,396         44.24         3,133,168         40.37         3,717,635         33.88   

Vested

    (3,428,736      33.27         (3,409,650      29.38         (3,744,411      22.17   

Cancelled

    (495,400      38.66         (455,806      34.05         (255,108      29.18   

Outstanding at end of period

    6,894,831       $ 38.44         7,921,571       $ 34.09         8,653,859       $ 29.96