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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock-based Compensation Arrangements Activity      
Stock-based compensation expense $ 59 $ 60 $ 64
Tax benefit recognized on stock-based compensation expense 21 21 22
Tax benefit realized for tax deductions resulting from exercises and vestings 66 64 66
Effect of tax deductions in excess of recognized stock-based compensation expense reported as a financing cash flow 44 47 47
Restricted Stock [Member]      
Stock-based Compensation Arrangements Activity      
Stock-based compensation expense $ 47 $ 43 $ 49
Nonvested Shares or Awards Other Than Options Rollforward      
Nonvested shares or awards, beginning balance 1,758,150    
Shares or awards, granted 829,213    
Awards, vested (1,016,862)    
Shares or awards, forfeited (19,061)    
Nonvested shares or awards, ending balance 1,551,440 1,758,150  
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward      
Weighted average grant date fair value, beginning balance $ 41.96    
Weighted average grant date fair value, granted 70.07 $ 49.40 $ 39.55
Weighted average grant date fair value, vested 41.72    
Weighted average grant date fair value, forfeited 41.42    
Weighted average grant date fair value, ending balance $ 57.15 $ 41.96  
Vested Awards Other Than Options Rollforward      
Fair value of vested awards $ 69 $ 60 $ 74
Stock Based Compensation (Textual)      
Vesting period of stock-based payment awards granted 3 years    
Unrecognized share-based compensation cost related to outstanding unvested awards $ 55    
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 $ 11 $ 15 11
Nonvested Shares or Awards Other Than Options Rollforward      
Nonvested shares or awards, beginning balance 614,390    
Shares or awards, granted 183,299    
Awards, vested (388,561)    
Shares or awards, forfeited (703)    
Nonvested shares or awards, ending balance 408,425 614,390  
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward      
Weighted average grant date fair value, beginning balance $ 42.06    
Weighted average grant date fair value, granted 88.97    
Weighted average grant date fair value, vested 38.77    
Weighted average grant date fair value, forfeited 48.57    
Weighted average grant date fair value, ending balance $ 66.23 $ 42.06  
Performance Awards Converted [Abstract]      
Vested awards converted 388,561    
Converted shares issued 706,100    
Stock Based Compensation (Textual)      
Vesting period of stock-based payment awards granted 1 year    
Unrecognized share-based compensation cost related to outstanding unvested awards $ 16    
Performance award vesting rights 33.33%    
Performance Awards [Member] | Award Year 2011 [Member]      
Performance Awards Converted [Abstract]      
Vested awards converted 213,299    
Actual conversion rate of common shares 166.70%    
Converted shares issued 355,576    
Performance Awards [Member] | Award Year 2012 [Member]      
Performance Awards Converted [Abstract]      
Vested awards converted 96,845    
Actual conversion rate of common shares 200.00%    
Converted shares issued 193,690    
Performance Awards [Member] | Award Year 2013 [Member]      
Performance Awards Converted [Abstract]      
Vested awards converted 78,417    
Actual conversion rate of common shares 200.00%    
Converted shares issued 156,834    
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 $ 2 $ 4
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 12,109,301    
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