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Medical Claims and Benefits Payable - Components of the Change (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Medical claims and benefits payable, beginning balance $ 4,204 $ 3,528 $ 3,363
Components of medical care costs related to:      
Current year 35,103 29,096 27,459
Prior years (675) (427) (284)
Incurred Claims and Allocated Claims Adjustment Expenses 34,428 28,669 27,175
Payments for medical care costs related to:      
Current year 31,060 25,615 24,345
Prior years 3,239 2,734 2,670
Total paid 34,299 28,349 27,015
Acquired balances, net of post-acquisition adjustments 476 96 12
Change in non-risk and other provider payables (169) 260 (7)
Medical claims and benefits payable, ending balance 4,640 4,204 3,528
Medicaid      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Medical claims and benefits payable, beginning balance 3,444 2,815 2,580
Components of medical care costs related to:      
Current year 28,211 23,749 22,097
Prior years (611) (395) (251)
Incurred Claims and Allocated Claims Adjustment Expenses 27,600 23,354 21,846
Payments for medical care costs related to:      
Current year 24,950 20,999 19,655
Prior years 2,258 2,069 1,966
Total paid 27,208 23,068 21,621
Acquired balances, net of post-acquisition adjustments 0 82 12
Change in non-risk and other provider payables (169) 261 (2)
Medical claims and benefits payable, ending balance 3,667 3,444 2,815
Medicare      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Medical claims and benefits payable, beginning balance 532 452 404
Components of medical care costs related to:      
Current year 5,000 3,802 3,390
Prior years (61) (11) (32)
Incurred Claims and Allocated Claims Adjustment Expenses 4,939 3,791 3,358
Payments for medical care costs related to:      
Current year 4,464 3,293 2,944
Prior years 761 431 361
Total paid 5,225 3,724 3,305
Acquired balances, net of post-acquisition adjustments 476 14 0
Change in non-risk and other provider payables 0 (1) (5)
Medical claims and benefits payable, ending balance 722 532 452
Marketplace      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Medical claims and benefits payable, beginning balance 228 261 379
Components of medical care costs related to:      
Current year 1,892 1,545 1,972
Prior years (3) (21) (1)
Incurred Claims and Allocated Claims Adjustment Expenses 1,889 1,524 1,971
Payments for medical care costs related to:      
Current year 1,646 1,323 1,746
Prior years 220 234 343
Total paid 1,866 1,557 2,089
Acquired balances, net of post-acquisition adjustments 0 0 0
Change in non-risk and other provider payables 0 0 0
Medical claims and benefits payable, ending balance $ 251 $ 228 $ 261