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Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Insurance Claims    
Medical claims and benefits payable, beginning balance $ 2,696 $ 1,854
Components of medical care costs related to:    
Current year 5,668 3,817
Prior years (194) (101)
Total medical care costs 5,474 3,716
Payments for medical care costs related to:    
Current year 3,513 2,274
Prior years 1,781 1,305
Total paid 5,294 3,579
Change in acquired balances (25)  
Change in non-risk and other provider payables (12) (10)
Medical claims and benefits payable, ending balance 2,839 1,981
Medicaid    
Insurance Claims    
Medical claims and benefits payable, beginning balance 2,129 1,465
Components of medical care costs related to:    
Current year 4,394 2,991
Prior years (158) (70)
Total medical care costs 4,236 2,921
Payments for medical care costs related to:    
Current year 2,790 1,786
Prior years 1,364 1,014
Total paid 4,154 2,800
Change in acquired balances 8  
Change in non-risk and other provider payables (11) (10)
Medical claims and benefits payable, ending balance 2,208 1,576
Medicare    
Insurance Claims    
Medical claims and benefits payable, beginning balance 392 267
Components of medical care costs related to:    
Current year 738 543
Prior years (16) (26)
Total medical care costs 722 517
Payments for medical care costs related to:    
Current year 410 324
Prior years 304 205
Total paid 714 529
Change in acquired balances (33)  
Change in non-risk and other provider payables (1) 0
Medical claims and benefits payable, ending balance 366 255
Marketplace    
Insurance Claims    
Medical claims and benefits payable, beginning balance 175 122
Components of medical care costs related to:    
Current year 536 283
Prior years (20) (5)
Total medical care costs 516 278
Payments for medical care costs related to:    
Current year 313 164
Prior years 113 86
Total paid 426 250
Change in acquired balances 0  
Change in non-risk and other provider payables 0 0
Medical claims and benefits payable, ending balance $ 265 $ 150