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Compensation Plans (RSUs and PSUs) (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 1,701,000    
Weighted-average grant date fair value per share, granted $ 59.50    
Senior Management Restricted Stock Units [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 2 years    
Senior Management Restricted Stock Units [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 365,177    
Grant date fair value $ 56.15    
Performance Shares [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage that will ultimately vest 0.00%    
Performance Shares [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage that will ultimately vest 200.00%    
Restricted Stock Units and Performance Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date fair value per share, granted $ 59.50 $ 71.66 $ 64.64
Unrecognized stock-based compensation expense $ 75    
Unrecognized stock-based compensation expense, weighted-average recognition period, in years 1 year 9 months 20 days    
Total fair value of stock units vested $ 83 $ 64 $ 75
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Requisite service period for retirement eligible employees 6 months