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Shareholders' Equity - Share-based Compensation, Awards, Unrecognized Compensation (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation $ 36
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation $ 21
Awards Compensation Costs Remaining Weighted Average Vesting Term, (Years) 11 months
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation $ 15
Awards Compensation Costs Remaining Weighted Average Vesting Term, (Years) 9 months