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Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Insurance Claims    
Medical claims and benefits payable, beginning balance $ 3,363 $ 2,696
Components of medical care costs related to:    
Current year 13,746 11,486
Prior years (311) (193)
Total medical care costs 13,435 11,293
Payments for medical care costs related to:    
Current year 10,622 9,023
Prior years 2,411 1,949
Total paid 13,033 10,972
Acquired balances, net of post-acquisition adjustments 7 (26)
Change in non-risk and other provider payables 3 (49)
Medical claims and benefits payable, ending balance 3,775 2,942
Medicaid    
Insurance Claims    
Medical claims and benefits payable, beginning balance 2,580 2,129
Components of medical care costs related to:    
Current year 11,059 8,869
Prior years (243) (150)
Total medical care costs 10,816 8,719
Payments for medical care costs related to:    
Current year 8,532 7,043
Prior years 1,801 1,491
Total paid 10,333 8,534
Acquired balances, net of post-acquisition adjustments 7 (19)
Change in non-risk and other provider payables 3 (48)
Medical claims and benefits payable, ending balance 3,073 2,247
Medicare    
Insurance Claims    
Medical claims and benefits payable, beginning balance 404 392
Components of medical care costs related to:    
Current year 1,681 1,459
Prior years (33) (24)
Total medical care costs 1,648 1,435
Payments for medical care costs related to:    
Current year 1,270 1,111
Prior years 330 330
Total paid 1,600 1,441
Acquired balances, net of post-acquisition adjustments 0 (7)
Change in non-risk and other provider payables 0 (1)
Medical claims and benefits payable, ending balance 452 378
Marketplace    
Insurance Claims    
Medical claims and benefits payable, beginning balance 379 175
Components of medical care costs related to:    
Current year 1,006 1,158
Prior years (35) (19)
Total medical care costs 971 1,139
Payments for medical care costs related to:    
Current year 820 869
Prior years 280 128
Total paid 1,100 997
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 $ 250 $ 317