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Share-Based Compensation - Narratives (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
May 31, 2020
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unearned compensation costs related to awards granted   $ 92      
Unearned compensation cost, expected to be recognized over period   1 year 4 months 24 days      
Vesting period   3 years      
2015 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for grant (in shares)   0      
2018 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for grant (in shares)   2,274,779      
RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years      
Number of share-equivalents issued (in shares)   336,168 181,351 134,419  
RSAs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years      
Number of share-equivalents issued (in shares)   6,640 6,122 6,005  
PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years      
Number of share-equivalents issued (in shares)   104,620 70,777 38,393  
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 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)   6,640 5,686 2,877  
SARs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value grants of SARs         $ 6
Intrinsic value of SARs exercised   $ 8 $ 8 $ 69  
Fair value vested   $ 2 3 5  
Cash-settled Awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years      
Share-based liabilities paid   $ 9 $ 5 $ 11  
Number of shares that became available under the plan (in shares)   45,460 66,923 11,644  
Employee Stock | 2020 ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for grant (in shares)   1,342,239      
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%