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Share-Based Incentive Plan (Valuation Assumptions) (Details) - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
2014 Program | Stock appreciation rights and performance shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Volatility 33.70% 31.60%  
Risk-free interest rate 1.70% 1.90%  
Expected term (years) 6 years 3 months 6 years 3 months  
Forfeiture rate 5.50% 5.50%  
2014 Program | Stock appreciation rights      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 4.4    
Weighted average grant date fair value per option $ 9.43 $ 9.43  
2014 Program | Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 1.5    
Weighted average grant date fair value per option $ 34.58 $ 34.58  
Long Term Incentive Plan 2003 | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Volatility 33.70% 31.60% 23.90%
Risk-free interest rate 1.70% 1.90% 1.10%
Expected term (years) 6 years 3 months 6 years 3 months 6 years 1 month
Forfeiture rate 5.50% 5.50% 5.50%
Weighted average grant date fair value per option $ 20.18 $ 17.44 $ 8.49