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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, 2021
Sep. 30, 2020
Insurance Claims    
Medical claims and benefits payable, beginning balance $ 2,696 $ 1,854
Components of medical care costs related to:    
Current year 17,558 11,478
Prior years (216) (66)
Total medical care costs 17,342 11,412
Payments for medical care costs related to:    
Current year 14,880 9,500
Prior years 2,008 1,527
Total paid 16,888 11,027
Change in acquired balances (27)  
Change in non-risk and other provider payables 68 50
Medical claims and benefits payable, ending balance 3,191 2,289
Medicaid    
Insurance Claims    
Medical claims and benefits payable, beginning balance 2,129 1,465
Components of medical care costs related to:    
Current year 13,491 9,029
Prior years (158) (41)
Total medical care costs 13,333 8,988
Payments for medical care costs related to:    
Current year 11,530 7,470
Prior years 1,538 1,193
Total paid 13,068 8,663
Change in acquired balances (19)  
Change in non-risk and other provider payables 68 50
Medical claims and benefits payable, ending balance 2,443 1,840
Medicare    
Insurance Claims    
Medical claims and benefits payable, beginning balance 392 267
Components of medical care costs related to:    
Current year 2,195 1,588
Prior years (36) (25)
Total medical care costs 2,159 1,563
Payments for medical care costs related to:    
Current year 1,816 1,316
Prior years 340 233
Total paid 2,156 1,549
Change in acquired balances (8)  
Change in non-risk and other provider payables 0 0
Medical claims and benefits payable, ending balance 387 281
Marketplace    
Insurance Claims    
Medical claims and benefits payable, beginning balance 175 122
Components of medical care costs related to:    
Current year 1,872 861
Prior years (22) 0
Total medical care costs 1,850 861
Payments for medical care costs related to:    
Current year 1,534 714
Prior years 130 101
Total paid 1,664 815
Change in acquired balances 0  
Change in non-risk and other provider payables 0 0
Medical claims and benefits payable, ending balance $ 361 $ 168