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Business Combinations - Intangible Assets (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Minimum  
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible asset useful life 5 years
Maximum  
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible asset useful life 16 years
Health Plans Segment  
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible assets $ 82
Weighted-average life 3 years 8 months 12 days
Health Plans Segment | Contract rights - member list  
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible assets value $ 81
Weighted-average life 3 years 8 months 12 days
Health Plans Segment | Contract rights - member list | Minimum  
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible asset useful life 2 years
Health Plans Segment | Contract rights - member list | Maximum  
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible asset useful life 5 years
Health Plans Segment | Provider network  
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible assets value $ 1
Weighted-average life 4 years
Health Plans Segment | Provider network | Minimum  
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible asset useful life 2 years
Health Plans Segment | Provider network | Maximum  
Acquired Finite-Lived Intangible Assets [Line Items]  
Intangible asset useful life 5 years