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Share-Based Compensation - Cash-Settled Awards (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash-settled share based units (in shares) 4,748,936   1,878,220
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash-settled share based units (in shares) 1,758,443   1,878,220
Share-based compensation liability $ 11 $ 3  
Performance Share Units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash-settled share based units (in shares) 2,990,493   0
Share-based compensation liability $ 8    
Performance Share Units (PSUs) | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of potential pay out, cash-settled award base on performance 0.00%    
Performance Share Units (PSUs) | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of potential pay out, cash-settled award base on performance 200.00%    
Cash-Settled Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation costs $ 72    
Unrecognized compensation costs, not yet recognized 2 years