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Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Insurance Claims    
Medical claims and benefits payable, beginning balance $ 4,204 $ 3,528
Components of medical care costs related to:    
Current year 8,748 7,169
Prior years (334) (298)
Total medical care costs 8,414 6,871
Payments for medical care costs related to:    
Current year 5,409 4,487
Prior years 2,879 2,358
Total paid 8,288 6,845
Acquired balances, net of post-acquisition adjustments 391 0
Change in non-risk and other payables (150) 270
Medical claims and benefits payable, ending balance 4,571 3,824
Medicaid    
Insurance Claims    
Medical claims and benefits payable, beginning balance 3,444 2,815
Components of medical care costs related to:    
Current year 7,007 5,865
Prior years (289) (250)
Total medical care costs 6,718 5,615
Payments for medical care costs related to:    
Current year 4,491 3,728
Prior years 2,066 1,822
Total paid 6,557 5,550
Acquired balances, net of post-acquisition adjustments 0 0
Change in non-risk and other payables (119) 270
Medical claims and benefits payable, ending balance 3,486 3,150
Medicare    
Insurance Claims    
Medical claims and benefits payable, beginning balance 532 452
Components of medical care costs related to:    
Current year 1,318 934
Prior years (39) (14)
Total medical care costs 1,279 920
Payments for medical care costs related to:    
Current year 702 542
Prior years 630 369
Total paid 1,332 911
Acquired balances, net of post-acquisition adjustments 391 0
Change in non-risk and other payables (31) 0
Medical claims and benefits payable, ending balance 839 461
Marketplace    
Insurance Claims    
Medical claims and benefits payable, beginning balance 228 261
Components of medical care costs related to:    
Current year 423 370
Prior years (6) (34)
Total medical care costs 417 336
Payments for medical care costs related to:    
Current year 216 217
Prior years 183 167
Total paid 399 384
Acquired balances, net of post-acquisition adjustments 0 0
Change in non-risk and other payables 0 0
Medical claims and benefits payable, ending balance $ 246 $ 213