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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, 2025 | Mar. 31, 2024
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | $ 4,640 | $ 4,204
Components of medical care costs related to: |  |
Current year | 9,665 | 8,748
Prior years | (186) | (334)
Total medical care costs | 9,479 | 8,414
Payments for medical care costs related to: |  |
Current year | 5,789 | 5,409
Prior years | 3,684 | 2,879
Total paid | 9,473 | 8,288
Acquired balances, net of post-acquisition adjustments | 245 | 391
Change in non-risk and other payables | (87) | (150)
Medical claims and benefits payable, ending balance | 4,804 | 4,571
Medicaid |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 3,667 | 3,444
Components of medical care costs related to: |  |
Current year | 7,495 | 7,006
Prior years | (156) | (289)
Total medical care costs | 7,339 | 6,717
Payments for medical care costs related to: |  |
Current year | 4,593 | 4,490
Prior years | 2,760 | 2,066
Total paid | 7,353 | 6,556
Acquired balances, net of post-acquisition adjustments | 0 | 0
Change in non-risk and other payables | (87) | (119)
Medical claims and benefits payable, ending balance | 3,566 | 3,486
Medicare |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 722 | 532
Components of medical care costs related to: |  |
Current year | 1,352 | 1,318
Prior years | (56) | (39)
Total medical care costs | 1,296 | 1,279
Payments for medical care costs related to: |  |
Current year | 721 | 702
Prior years | 623 | 630
Total paid | 1,344 | 1,332
Acquired balances, net of post-acquisition adjustments | 122 | 391
Change in non-risk and other payables | 0 | (31)
Medical claims and benefits payable, ending balance | 796 | 839
Marketplace |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 251 | 228
Components of medical care costs related to: |  |
Current year | 795 | 424
Prior years | 26 | (6)
Total medical care costs | 821 | 418
Payments for medical care costs related to: |  |
Current year | 458 | 217
Prior years | 287 | 183
Total paid | 745 | 400
Acquired balances, net of post-acquisition adjustments | 88 | 0
Change in non-risk and other payables | 0 | 0
Medical claims and benefits payable, ending balance | 415 | 246
Other |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 0 | 0
Components of medical care costs related to: |  |
Current year | 23 | 0
Prior years | 0 | 0
Total medical care costs | 23 | 0
Payments for medical care costs related to: |  |
Current year | 17 | 0
Prior years | 14 | 0
Total paid | 31 | 0
Acquired balances, net of post-acquisition adjustments | 35 | 0
Change in non-risk and other payables | 0 | 0
Medical claims and benefits payable, ending balance | $ 27 | $ 0

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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://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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