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Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | $ 4,640 | $ 4,204
Components of medical care costs related to: |  |
Current year | 29,476 | 26,050
Prior years | (124) | (625)
Total medical care costs | 29,352 | 25,425
Payments for medical care costs related to: |  |
Current year | 25,425 | 22,172
Prior years | 4,059 | 3,215
Total paid | 29,484 | 25,387
Acquired balances, net of post-acquisition adjustments | 361 | 463
Change in non-risk and other payables | (25) | 27
Medical claims and benefits payable, ending balance | 4,844 | 4,732
Medicaid |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 3,667 | 3,444
Components of medical care costs related to: |  |
Current year | 22,165 | 20,903
Prior years | (118) | (553)
Total medical care costs | 22,047 | 20,350
Payments for medical care costs related to: |  |
Current year | 19,074 | 17,813
Prior years | 3,067 | 2,256
Total paid | 22,141 | 20,069
Acquired balances, net of post-acquisition adjustments | 0 | 0
Change in non-risk and other payables | (25) | 27
Medical claims and benefits payable, ending balance | 3,548 | 3,752
Medicare |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 722 | 532
Components of medical care costs related to: |  |
Current year | 4,306 | 3,798
Prior years | (56) | (70)
Total medical care costs | 4,250 | 3,728
Payments for medical care costs related to: |  |
Current year | 3,753 | 3,237
Prior years | 676 | 742
Total paid | 4,429 | 3,979
Acquired balances, net of post-acquisition adjustments | 152 | 463
Change in non-risk and other payables | 0 | 0
Medical claims and benefits payable, ending balance | 695 | 744
Marketplace |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 251 | 228
Components of medical care costs related to: |  |
Current year | 2,940 | 1,349
Prior years | 50 | (2)
Total medical care costs | 2,990 | 1,347
Payments for medical care costs related to: |  |
Current year | 2,525 | 1,122
Prior years | 306 | 217
Total paid | 2,831 | 1,339
Acquired balances, net of post-acquisition adjustments | 173 | 0
Change in non-risk and other payables | 0 | 0
Medical claims and benefits payable, ending balance | 583 | 236
Other |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 0 | 0
Components of medical care costs related to: |  |
Current year | 65 | 0
Prior years | 0 | 0
Total medical care costs | 65 | 0
Payments for medical care costs related to: |  |
Current year | 73 | 0
Prior years | 10 | 0
Total paid | 83 | 0
Acquired balances, net of post-acquisition adjustments | 36 | 0
Change in non-risk and other payables | 0 | 0
Medical claims and benefits payable, ending balance | $ 18 | $ 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 605 -Name Accounting Standards Codification -Section 55 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477548/944-605-55-11 Reference 2: 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 3: 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 4: 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 5: 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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