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Stock-Based Compensation - Summary of Activity for RSUs and PSUs (Details) - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award Line Items    
Unvested, Beginning balance 0.4  
Unvested, Ending balance 0.4 0.4
RSUs and PSUs    
Share Based Compensation Arrangement By Share Based Payment Award Line Items    
Unvested, Beginning balance 0.4  
Granted 0.3 0.5
Forfeited   (0.1)
Vested (0.1)  
PSU performance adjustment (0.2)  
Unvested, Ending balance 0.4 0.4
Unvested, Beginning balance $ 29  
Granted 30 $ 29
Forfeited   27
Vested 28  
PSU performance adjustment 30  
Unvested, Ending balance $ 29 $ 29