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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock-based Compensation Arrangements Activity      
Stock-based compensation expense $ 77 $ 68 $ 59
Tax benefit recognized on stock-based compensation expense 27 24 21
Tax benefit realized for tax deductions resulting from exercises and vestings 44 33 66
Effect of tax deductions in excess of recognized stock-based compensation expense (a) [1] 24 22 44
Restricted Stock [Member]      
Stock-based Compensation Arrangements Activity      
Stock-based compensation expense $ 58 $ 52 $ 47
Nonvested Shares or Awards Other Than Options Rollforward      
Nonvested shares or awards, beginning balance (shares) 1,566,950    
Shares or awards, granted (shares) 739,393    
Shares or awards, vested (shares) (897,246)    
Shares or awards, forfeited (shares) (8,057)    
Nonvested shares or awards, ending balance (shares) 1,401,040 1,566,950  
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward      
Weighted average grant date fair value, beginning balance (in dollars per share) $ 60.68    
Weighted average grant date fair value, granted (in dollars per share) 79.32 $ 59.00 $ 70.07
Weighted average grant date fair value, vested (in dollars per share) 61.76    
Weighted average grant date fair value, forfeited (in dollars per share) 61.22    
Weighted average grant date fair value, ending balance (in dollars per share) $ 69.82 $ 60.68  
Vested Awards Other Than Options Rollforward      
Fair value of vested awards $ 71 $ 46 $ 69
Stock Based Compensation (Textual)      
Vesting period of stock-based payment awards granted 3 years    
Unrecognized share-based compensation cost related to outstanding unvested awards $ 61    
Weighted-average period of recognition for unrecognized compensation costs on nonvested awards 2 years    
Restricted Stock Awards - Nonemployee [Member]      
Stock Based Compensation (Textual)      
Vesting period of stock-based payment awards granted 3 years    
Performance Awards [Member]      
Stock-based Compensation Arrangements Activity      
Stock-based compensation expense $ 19 15 11
Employee Stock Option [Member]      
Stock-based Compensation Arrangements Activity      
Stock-based compensation expense $ 0 $ 1 $ 1
Omnibus Stock Incentive Plan [Member] | Stock Compensation Plan [Member]      
Stock Based Compensation (Textual)      
Number of shares of common stock available to be awarded under stock-based compensation plans (shares) 9,409,188    
Formerly Maintained Plans [Member] | Stock Compensation Plan [Member]      
Stock Based Compensation (Textual)      
Number of shares of common stock available to be awarded under stock-based compensation plans (shares) 0    
[1] Effective January 1, 2016, the effect of tax deductions in excess of recognized stock-based compensation expense is reported as an operating cash flow. These amounts were previously reported as financing cash flows.