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Medical Claims and Benefits Payable - Components of the Change (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Medical claims and benefits payable, beginning balance $ 2,696 $ 1,854 $ 1,961
Components of medical care costs related to:      
Current year 23,943 15,939 14,176
Prior years (239) (119) (271)
Incurred Claims and Allocated Claims Adjustment Expenses 23,704 15,820 13,905
Payments for medical care costs related to:      
Current year 21,148 13,871 12,554
Prior years 2,080 1,507 1,482
Total paid 23,228 15,378 14,036
Acquired balances, net of post-acquisition adjustments 197 294 0
Change in non-risk and other provider payables (6) 106 24
Medical claims and benefits payable, ending balance 3,363 2,696 1,854
Medicaid Segment      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Medical claims and benefits payable, beginning balance 2,129 1,465 1,554
Components of medical care costs related to:      
Current year 18,321 12,545 11,191
Prior years (182) (84) (222)
Incurred Claims and Allocated Claims Adjustment Expenses 18,139 12,461 10,969
Payments for medical care costs related to:      
Current year 16,284 10,940 9,936
Prior years 1,601 1,176 1,145
Total paid 17,885 12,116 11,081
Acquired balances, net of post-acquisition adjustments 205 215 0
Change in non-risk and other provider payables (8) 104 23
Medical claims and benefits payable, ending balance 2,580 2,129 1,465
Medicare Segment      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Medical claims and benefits payable, beginning balance 392 267 253
Components of medical care costs related to:      
Current year 2,970 2,189 1,934
Prior years (39) (28) (21)
Incurred Claims and Allocated Claims Adjustment Expenses 2,931 2,161 1,913
Payments for medical care costs related to:      
Current year 2,573 1,884 1,676
Prior years 340 233 224
Total paid 2,913 2,117 1,900
Acquired balances, net of post-acquisition adjustments (8) 79 0
Change in non-risk and other provider payables 2 2 1
Medical claims and benefits payable, ending balance 404 392 267
Marketplace Segment      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Medical claims and benefits payable, beginning balance 175 122 154
Components of medical care costs related to:      
Current year 2,652 1,205 1,051
Prior years (18) (7) (28)
Incurred Claims and Allocated Claims Adjustment Expenses 2,634 1,198 1,023
Payments for medical care costs related to:      
Current year 2,291 1,047 942
Prior years 139 98 113
Total paid 2,430 1,145 1,055
Acquired balances, net of post-acquisition adjustments 0 0 0
Change in non-risk and other provider payables 0 0 0
Medical claims and benefits payable, ending balance $ 379 $ 175 $ 122