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Share-Based Compensation - Narratives (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unearned compensation costs related to awards granted $ 127    
Unearned compensation cost, expected to be recognized over period 1 year 4 months 24 days    
Vesting period 3 years    
2018 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant (in shares) 1,841,117    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Number of share-equivalents issued (in shares) 277,390 336,168 181,351
RSAs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Number of share-equivalents issued (in shares) 6,264 6,640 6,122
PSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Number of share-equivalents issued (in shares) 88,029 104,620 70,777
PSAs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Number of share-equivalents issued (in shares)   0 0
Class A Common Stock | Non-employee directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of share-equivalents issued (in shares) 6,264 6,640 5,686
SARs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Intrinsic value of SARs exercised $ 39 $ 8 $ 8
Fair value vested $ 1 2 3
Cash-settled Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Share-based liabilities paid $ 13 $ 9 $ 5
Number of shares that became available under the plan (in shares) 59,266 45,460 66,923
Employee Stock | 2020 ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant (in shares) 1,304,693    
Number of shares that became available under the plan (in shares) 1,500,000    
Purchase price equal to lesser of fair market value percentage 95.00%