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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, 2021
Jun. 30, 2020
Insurance Claims    
Medical claims and benefits payable, beginning balance $ 2,696 $ 1,854
Components of medical care costs related to:    
Current year 11,486 7,372
Prior years (193) (58)
Total medical care costs 11,293 7,314
Payments for medical care costs related to:    
Current year 9,023 5,688
Prior years 1,949 1,486
Total paid 10,972 7,174
Change in acquired balances (26)  
Change in non-risk and other provider payables (49) (34)
Medical claims and benefits payable, ending balance 2,942 1,960
Medicaid    
Insurance Claims    
Medical claims and benefits payable, beginning balance 2,129 1,465
Components of medical care costs related to:    
Current year 8,869 5,777
Prior years (150) (34)
Total medical care costs 8,719 5,743
Payments for medical care costs related to:    
Current year 7,043 4,493
Prior years 1,491 1,161
Total paid 8,534 5,654
Change in acquired balances (19)  
Change in non-risk and other provider payables (48) (34)
Medical claims and benefits payable, ending balance 2,247 1,520
Medicare    
Insurance Claims    
Medical claims and benefits payable, beginning balance 392 267
Components of medical care costs related to:    
Current year 1,459 1,044
Prior years (24) (22)
Total medical care costs 1,435 1,022
Payments for medical care costs related to:    
Current year 1,111 783
Prior years 330 228
Total paid 1,441 1,011
Change in acquired balances (7)  
Change in non-risk and other provider payables (1) 0
Medical claims and benefits payable, ending balance 378 278
Marketplace    
Insurance Claims    
Medical claims and benefits payable, beginning balance 175 122
Components of medical care costs related to:    
Current year 1,158 551
Prior years (19) (2)
Total medical care costs 1,139 549
Payments for medical care costs related to:    
Current year 869 412
Prior years 128 97
Total paid 997 509
Change in acquired balances 0  
Change in non-risk and other provider payables 0 0
Medical claims and benefits payable, ending balance $ 317 $ 162