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Share-Based Compensation and Other Incentive Plans - Valuation Assumptions (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2015
Employee Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility 23.80% 24.70% 24.00%  
Risk-free interest rate 2.30% 2.70% 2.10%  
Dividend yield 2.50% 2.40% 3.50%  
Expected life (years) 6 years 5 years 10 months 24 days 5 years 10 months 24 days  
Performance Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility 22.40% 25.00% 24.10%  
Expected volatility of the S&P 500 25.10% 25.30% 25.60%  
Risk-free interest rate 2.30% 2.70% 2.40%  
Dividend yield 2.70% 3.10% 3.70%  
Expected life (years) 6 years 6 months 6 years 6 months 6 years 6 months  
Market Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility 22.40% 25.00% 24.10%  
Risk-free interest rate 2.20% 2.40% 1.70%  
Dividend yield 2.00% 2.20% 2.90%  
Performance Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility 20.60%      
Expected volatility of the S&P 500 25.00%      
Risk-free interest rate 2.20%      
Dividend yield 1.60%      
Expected life (years) 3 years      
PCSOs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility     24.10% 26.00%
Risk-free interest rate     1.80% 1.50%
Dividend yield     3.00% 3.10%
Expected life (years)     3 years 6 months 5 years