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Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Receivables $ 3,491 $ 3,299
Minimum MLR, medical cost corridors and profit sharing liability $ 856 $ 1,006
Percent due to medicare, medical loss ratio 85.00% 85.00%
Government agencies liability $ 39 $ 32
Percent due to medicare, medical loss ratio of marketplace 80.00% 80.00%
Medical loss ratio of marketplace $ 33 $ 30
Risk adjustments liability 112 115
Risk adjustment payable 454 290
Risk adjustment receivable 227 192
Risk adjustment, net receivable $ (227) (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 $ 2,265 $ 2,223