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Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Receivables $ 3,865 $ 3,299
Minimum MLR, medical cost corridors and profit sharing liability $ 771 $ 1,006
Percent due to medicare, medical loss ratio 85.00% 85.00%
Government agencies liability $ 40 $ 32
Percent due to medicare, medical loss ratio of marketplace 80.00% 80.00%
Medical loss ratio of marketplace $ 35 $ 30
Risk adjustments liability 117 115
Risk adjustment receivable (payable) (545) (290)
Risk adjustment receivable 252 192
Risk adjustment, net receivable (payable) $ (293) (98)
Maturity period (less than) 15 years  
Structured Securities    
Property, Plant and Equipment [Line Items]    
Average maturity period (less than) 15 years  
Government Receivables    
Property, Plant and Equipment [Line Items]    
Receivables $ 2,662 $ 2,223