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Goodwill and Intangible Assets, Net - Balances of Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Roll Forward]    
Beginning balance $ 1,115 $ 982
Acquisitions and measurement period adjustments 126 133
Ending balance 1,241 1,115
Medicaid    
Goodwill [Roll Forward]    
Beginning balance 899 769
Acquisitions and measurement period adjustments 95 130
Ending balance 994 899
Medicare    
Goodwill [Roll Forward]    
Beginning balance 172 169
Acquisitions and measurement period adjustments 31 3
Ending balance 203 172
Other    
Goodwill [Roll Forward]    
Beginning balance 44 44
Acquisitions and measurement period adjustments 0 0
Ending balance $ 44 $ 44