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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, 2022
Mar. 31, 2021
Insurance Claims    
Medical claims and benefits payable, beginning balance $ 3,363 $ 2,696
Components of medical care costs related to:    
Current year 6,769 5,668
Prior years (206) (194)
Total medical care costs 6,563 5,474
Payments for medical care costs related to:    
Current year 4,197 3,513
Prior years 2,199 1,781
Total paid 6,396 5,294
Acquired balances, net of post-acquisition adjustments (25) (25)
Change in non-risk and other provider payables 96 (12)
Medical claims and benefits payable, ending balance 3,601 2,839
Medicaid    
Insurance Claims    
Medical claims and benefits payable, beginning balance 2,580 2,129
Components of medical care costs related to:    
Current year 5,424 4,394
Prior years (154) (158)
Total medical care costs 5,270 4,236
Payments for medical care costs related to:    
Current year 3,402 2,790
Prior years 1,633 1,364
Total paid 5,035 4,154
Acquired balances, net of post-acquisition adjustments (25) 8
Change in non-risk and other provider payables 93 (11)
Medical claims and benefits payable, ending balance 2,883 2,208
Medicare    
Insurance Claims    
Medical claims and benefits payable, beginning balance 404 392
Components of medical care costs related to:    
Current year 840 738
Prior years (25) (16)
Total medical care costs 815 722
Payments for medical care costs related to:    
Current year 465 410
Prior years 306 304
Total paid 771 714
Acquired balances, net of post-acquisition adjustments 0 (33)
Change in non-risk and other provider payables 3 (1)
Medical claims and benefits payable, ending balance 451 366
Marketplace    
Insurance Claims    
Medical claims and benefits payable, beginning balance 379 175
Components of medical care costs related to:    
Current year 505 536
Prior years (27) (20)
Total medical care costs 478 516
Payments for medical care costs related to:    
Current year 330 313
Prior years 260 113
Total paid 590 426
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 $ 267 $ 265