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Medical Claims and Benefits Payable - Components of the Change (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Medical claims and benefits payable, beginning balance $ 3,528 $ 3,363 $ 2,696
Components of medical care costs related to:      
Current year 29,096 27,459 23,943
Prior years (427) (284) (239)
Incurred Claims and Allocated Claims Adjustment Expenses 28,669 27,175 23,704
Payments for medical care costs related to:      
Current year 25,615 24,345 21,148
Prior years 2,734 2,670 2,080
Total paid 28,349 27,015 23,228
Acquired balances, net of post-acquisition adjustments 96 12 197
Change in non-risk and other provider payables 260 (7) (6)
Medical claims and benefits payable, ending balance 4,204 3,528 3,363
Medicaid      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Medical claims and benefits payable, beginning balance 2,815 2,580 2,129
Components of medical care costs related to:      
Current year 23,749 22,097 18,321
Prior years (395) (251) (182)
Incurred Claims and Allocated Claims Adjustment Expenses 23,354 21,846 18,139
Payments for medical care costs related to:      
Current year 20,999 19,655 16,284
Prior years 2,069 1,966 1,601
Total paid 23,068 21,621 17,885
Acquired balances, net of post-acquisition adjustments 82 12 205
Change in non-risk and other provider payables 261 (2) (8)
Medical claims and benefits payable, ending balance 3,444 2,815 2,580
Medicare      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Medical claims and benefits payable, beginning balance 452 404 392
Components of medical care costs related to:      
Current year 3,802 3,390 2,970
Prior years (11) (32) (39)
Incurred Claims and Allocated Claims Adjustment Expenses 3,791 3,358 2,931
Payments for medical care costs related to:      
Current year 3,293 2,944 2,573
Prior years 431 361 340
Total paid 3,724 3,305 2,913
Acquired balances, net of post-acquisition adjustments 14 0 (8)
Change in non-risk and other provider payables (1) (5) 2
Medical claims and benefits payable, ending balance 532 452 404
Marketplace      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Medical claims and benefits payable, beginning balance 261 379 175
Components of medical care costs related to:      
Current year 1,545 1,972 2,652
Prior years (21) (1) (18)
Incurred Claims and Allocated Claims Adjustment Expenses 1,524 1,971 2,634
Payments for medical care costs related to:      
Current year 1,323 1,746 2,291
Prior years 234 343 139
Total paid 1,557 2,089 2,430
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 $ 228 $ 261 $ 379