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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

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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