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Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Insurance Claims    
Medical claims and benefits payable, beginning balance $ 3,363 $ 2,696
Components of medical care costs related to:    
Current year 20,521 17,558
Prior years (338) (216)
Total medical care costs 20,183 17,342
Payments for medical care costs related to:    
Current year 17,538 14,880
Prior years 2,481 2,008
Total paid 20,019 16,888
Acquired balances, net of post-acquisition adjustments 8 (27)
Change in non-risk and other provider payables 87 68
Medical claims and benefits payable, ending balance 3,622 3,191
Medicaid    
Insurance Claims    
Medical claims and benefits payable, beginning balance 2,580 2,129
Components of medical care costs related to:    
Current year 16,520 13,491
Prior years (282) (158)
Total medical care costs 16,238 13,333
Payments for medical care costs related to:    
Current year 14,133 11,530
Prior years 1,861 1,538
Total paid 15,994 13,068
Acquired balances, net of post-acquisition adjustments 8 (19)
Change in non-risk and other provider payables 91 68
Medical claims and benefits payable, ending balance 2,923 2,443
Medicare    
Insurance Claims    
Medical claims and benefits payable, beginning balance 404 392
Components of medical care costs related to:    
Current year 2,525 2,195
Prior years (38) (36)
Total medical care costs 2,487 2,159
Payments for medical care costs related to:    
Current year 2,103 1,816
Prior years 337 340
Total paid 2,440 2,156
Acquired balances, net of post-acquisition adjustments 0 (8)
Change in non-risk and other provider payables (4) 0
Medical claims and benefits payable, ending balance 447 387
Marketplace    
Insurance Claims    
Medical claims and benefits payable, beginning balance 379 175
Components of medical care costs related to:    
Current year 1,476 1,872
Prior years (18) (22)
Total medical care costs 1,458 1,850
Payments for medical care costs related to:    
Current year 1,302 1,534
Prior years 283 130
Total paid 1,585 1,664
Acquired balances, net of post-acquisition adjustments 0 0
Change in non-risk and other provider payables 0 0
Medical claims and benefits payable, ending balance $ 252 $ 361