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Employee Benefits Restricted Stock and Performance Share Awards (Details) - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding at December 31, 2018 0.8    
Granted 0.5    
Vested (0.3)    
Forfeited (0.3)    
Outstanding at December 31, 2019 0.7 0.8  
Share-based Compensation Arrangement by Share-based Payment Award, Weighted Average Grant-Date Fair Value Per Share      
Outstanding at December 31, 2018 $ 82.42    
Granted 68.30 $ 88.76 $ 74.42
Vested 77.37    
Forfeited 69.25    
Outstanding at December 31, 2019 $ 80.42 $ 82.42  
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding at December 31, 2018 14.9    
Granted 9.6    
Vested (5.3)    
Forfeited (2.0)    
Outstanding at December 31, 2019 17.2 14.9  
Share-based Compensation Arrangement by Share-based Payment Award, Weighted Average Grant-Date Fair Value Per Share      
Outstanding at December 31, 2018 $ 77.72    
Granted 64.31 $ 77.98 $ 73.56
Vested 79.98    
Forfeited 72.89    
Outstanding at December 31, 2019 $ 70.08 $ 77.72  
Minimum [Member] | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award, Weighted Average Grant-Date Fair Value Per Share      
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Pay-out Percentage 0.00%    
Minimum [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Maximum [Member] | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award, Weighted Average Grant-Date Fair Value Per Share      
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Pay-out Percentage 200.00%    
Maximum [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years