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Medical Claims and Benefits Payable - Components of the Change (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Medical claims and benefits payable, beginning balance | $ 3,363 | $ 2,696 | $ 1,854
Components of medical care costs related to: |  |  |
Current year | 27,459 | 23,943 | 15,939
Prior years | (284) | (239) | (119)
Incurred Claims and Allocated Claims Adjustment Expenses | 27,175 | 23,704 | 15,820
Payments for medical care costs related to: |  |  |
Current year | 24,345 | 21,148 | 13,871
Prior years | 2,670 | 2,080 | 1,507
Total paid | 27,015 | 23,228 | 15,378
Acquired balances, net of post-acquisition adjustments | 12 | 197 | 294
Change in non-risk and other provider payables | (7) | (6) | 106
Medical claims and benefits payable, ending balance | 3,528 | 3,363 | 2,696
Medicaid Segment |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Medical claims and benefits payable, beginning balance | 2,580 | 2,129 | 1,465
Components of medical care costs related to: |  |  |
Current year | 22,097 | 18,321 | 12,545
Prior years | (251) | (182) | (84)
Incurred Claims and Allocated Claims Adjustment Expenses | 21,846 | 18,139 | 12,461
Payments for medical care costs related to: |  |  |
Current year | 19,655 | 16,284 | 10,940
Prior years | 1,966 | 1,601 | 1,176
Total paid | 21,621 | 17,885 | 12,116
Acquired balances, net of post-acquisition adjustments | 12 | 205 | 215
Change in non-risk and other provider payables | (2) | (8) | 104
Medical claims and benefits payable, ending balance | 2,815 | 2,580 | 2,129
Medicare Segment |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Medical claims and benefits payable, beginning balance | 404 | 392 | 267
Components of medical care costs related to: |  |  |
Current year | 3,390 | 2,970 | 2,189
Prior years | (32) | (39) | (28)
Incurred Claims and Allocated Claims Adjustment Expenses | 3,358 | 2,931 | 2,161
Payments for medical care costs related to: |  |  |
Current year | 2,944 | 2,573 | 1,884
Prior years | 361 | 340 | 233
Total paid | 3,305 | 2,913 | 2,117
Acquired balances, net of post-acquisition adjustments | 0 | (8) | 79
Change in non-risk and other provider payables | (5) | 2 | 2
Medical claims and benefits payable, ending balance | 452 | 404 | 392
Marketplace Segment |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Medical claims and benefits payable, beginning balance | 379 | 175 | 122
Components of medical care costs related to: |  |  |
Current year | 1,972 | 2,652 | 1,205
Prior years | (1) | (18) | (7)
Incurred Claims and Allocated Claims Adjustment Expenses | 1,971 | 2,634 | 1,198
Payments for medical care costs related to: |  |  |
Current year | 1,746 | 2,291 | 1,047
Prior years | 343 | 139 | 98
Total paid | 2,089 | 2,430 | 1,145
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 | $ 261 | $ 379 | $ 175

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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 https://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 https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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