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Share-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock, shares authorized 1,500,000,000 1,000,000,000
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested $ 21  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 50  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 6 months  
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 8 months 11 days  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used Black-Scholes option pricing model  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 7  
Performance Shares [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  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used Monte Carlo simulation  
Management [Member] | Employee Stock Option [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  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 33.30%  
Management [Member] | Employee Stock Option [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 7 years  
Management [Member] | Employee Stock Option [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years  
Management [Member] | Performance Shares [Member] | Share-Based Comp Award Three Year Anniversary [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  
Management [Member] | Performance Shares [Member] | Year of 2016 [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 200.00%  
Management [Member] | Performance Shares [Member] | Year of 2016 [Member] | Share-Based Compensation Award, TSR [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award less than zero  
Management [Member] | Performance Shares [Member] | Year of 2016 [Member] | Share-Based Compensation Award, TSR [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.00%  
Management [Member] | Performance Shares [Member] | Year of 2016 [Member] | Share-Based Compensation Award, TSR [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 100.00%  
Management [Member] | Performance Shares [Member] | Year of 2016 [Member] | Share-Based Compensation Award, Operational Unit [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.00%  
Management [Member] | Performance Shares [Member] | Year of 2016 [Member] | Share-Based Compensation Award, Operational Unit [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 100.00%  
Management [Member] | Performance Shares [Member] | Year of 2015 [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 200.00%  
Management [Member] | Performance Shares [Member] | Year of 2015 [Member] | Share-Based Compensation Award, TSR [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.00%  
Management [Member] | Performance Shares [Member] | Year of 2015 [Member] | Share-Based Compensation Award, TSR [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 100.00%  
Management [Member] | Performance Shares [Member] | Year of 2015 [Member] | Share-Based Compensation Award, Operational Unit [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.00%  
Management [Member] | Performance Shares [Member] | Year of 2015 [Member] | Share-Based Compensation Award, Operational Unit [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%  
Management [Member] | Performance Shares [Member] | Year of 2014 [Member] | Share-Based Compensation Award, TSR [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.00%  
Management [Member] | Performance Shares [Member] | Year of 2014 [Member] | Share-Based Compensation Award, TSR [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 200.00%  
2014 Long Term Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Reduction due to issuance of stock option or SAR 1.0  
Reduction due to award other than stock option or SAR 2.12  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 10 years  
Common Stock, Capital Shares Reserved for Future Issuance 61,856,065  
2014 Long Term Incentive Plan [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock, shares authorized 71,600,000