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Share-Based Compensation - Unrecognized compensation cost and period for recognition (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation cost related to unvested awards $ 7
Weighted average recognition period (years) 8 months 1 day
Restricted Common Shares And Restricted Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation cost related to unvested awards $ 43
Weighted average recognition period (years) 11 months 12 days
Performance Common Shares and Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation cost related to unvested awards $ 11
Weighted average recognition period (years) 5 months 8 days