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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock-based Compensation Arrangements Activity      
Stock-based compensation expense $ 68 $ 59 $ 60
Tax benefit recognized on stock-based compensation expense 24 21 21
Tax benefit realized for tax deductions resulting from exercises and vestings 33 66 64
Effect of tax deductions in excess of recognized stock-based compensation expense (a) [1] 22 44 47
Restricted Stock [Member]      
Stock-based Compensation Arrangements Activity      
Stock-based compensation expense $ 52 $ 47 $ 43
Nonvested Shares or Awards Other Than Options Rollforward      
Nonvested shares or awards, beginning balance 1,551,440    
Shares or awards, granted 1,004,935    
Awards, vested (978,845)    
Shares or awards, forfeited (10,580)    
Nonvested shares or awards, ending balance 1,566,950 1,551,440  
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward      
Weighted average grant date fair value, beginning balance $ 57.15    
Weighted average grant date fair value, granted 59.00 $ 70.07 $ 49.40
Weighted average grant date fair value, vested 53.40    
Weighted average grant date fair value, forfeited 57.37    
Weighted average grant date fair value, ending balance $ 60.68 $ 57.15  
Vested Awards Other Than Options Rollforward      
Fair value of vested awards $ 46 $ 69 $ 60
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 $ 15 $ 11 15
Nonvested Shares or Awards Other Than Options Rollforward      
Nonvested shares or awards, beginning balance 408,425    
Shares or awards, granted 170,327    
Awards, vested (225,126)    
Shares or awards, forfeited (15,237)    
Nonvested shares or awards, ending balance 338,389 408,425  
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward      
Weighted average grant date fair value, beginning balance $ 66.23    
Weighted average grant date fair value, granted 88.79    
Weighted average grant date fair value, vested 47.71    
Weighted average grant date fair value, forfeited 91.88    
Weighted average grant date fair value, ending balance $ 88.75 $ 66.23  
Performance Awards Converted [Abstract]      
Vested awards converted 225,126    
Converted shares issued 450,252    
Stock Based Compensation (Textual)      
Vesting period of stock-based payment awards granted 1 year    
Unrecognized share-based compensation cost related to outstanding unvested awards $ 15    
Performance award vesting rights 33.33%    
Performance Awards [Member] | Award Year 2012 [Member]      
Performance Awards Converted [Abstract]      
Vested awards converted 96,844    
Actual conversion rate of common shares 200.00%    
Converted shares issued 193,688    
Performance Awards [Member] | Award Year 2013 [Member]      
Performance Awards Converted [Abstract]      
Vested awards converted 78,411    
Actual conversion rate of common shares 200.00%    
Converted shares issued 156,822    
Performance Awards [Member] | Award Year 2014 [Member]      
Performance Awards Converted [Abstract]      
Vested awards converted 49,871    
Actual conversion rate of common shares 200.00%    
Converted shares issued 99,742    
Performance Awards [Member] | Minimum [Member]      
Stock Based Compensation (Textual)      
Performance awards range of conversion rates 0.00%    
Performance Awards [Member] | Maximum [Member]      
Stock Based Compensation (Textual)      
Performance awards range of conversion rates 200.00%    
Employee Stock Option [Member]      
Stock-based Compensation Arrangements Activity      
Stock-based compensation expense $ 1 $ 1 $ 2
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 10,581,274    
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 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.