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Medical Claims and Benefits Payable - Components of the Change (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Medical claims and benefits payable, beginning balance | $ 4,204 | $ 3,528 | $ 3,363
Components of medical care costs related to: |  |  |
Current year | 35,103 | 29,096 | 27,459
Prior years | (675) | (427) | (284)
Incurred Claims and Allocated Claims Adjustment Expenses | 34,428 | 28,669 | 27,175
Payments for medical care costs related to: |  |  |
Current year | 31,060 | 25,615 | 24,345
Prior years | 3,239 | 2,734 | 2,670
Total paid | 34,299 | 28,349 | 27,015
Acquired balances, net of post-acquisition adjustments | 476 | 96 | 12
Change in non-risk and other provider payables | (169) | 260 | (7)
Medical claims and benefits payable, ending balance | 4,640 | 4,204 | 3,528
Medicaid |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Medical claims and benefits payable, beginning balance | 3,444 | 2,815 | 2,580
Components of medical care costs related to: |  |  |
Current year | 28,211 | 23,749 | 22,097
Prior years | (611) | (395) | (251)
Incurred Claims and Allocated Claims Adjustment Expenses | 27,600 | 23,354 | 21,846
Payments for medical care costs related to: |  |  |
Current year | 24,950 | 20,999 | 19,655
Prior years | 2,258 | 2,069 | 1,966
Total paid | 27,208 | 23,068 | 21,621
Acquired balances, net of post-acquisition adjustments | 0 | 82 | 12
Change in non-risk and other provider payables | (169) | 261 | (2)
Medical claims and benefits payable, ending balance | 3,667 | 3,444 | 2,815
Medicare |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Medical claims and benefits payable, beginning balance | 532 | 452 | 404
Components of medical care costs related to: |  |  |
Current year | 5,000 | 3,802 | 3,390
Prior years | (61) | (11) | (32)
Incurred Claims and Allocated Claims Adjustment Expenses | 4,939 | 3,791 | 3,358
Payments for medical care costs related to: |  |  |
Current year | 4,464 | 3,293 | 2,944
Prior years | 761 | 431 | 361
Total paid | 5,225 | 3,724 | 3,305
Acquired balances, net of post-acquisition adjustments | 476 | 14 | 0
Change in non-risk and other provider payables | 0 | (1) | (5)
Medical claims and benefits payable, ending balance | 722 | 532 | 452
Marketplace |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Medical claims and benefits payable, beginning balance | 228 | 261 | 379
Components of medical care costs related to: |  |  |
Current year | 1,892 | 1,545 | 1,972
Prior years | (3) | (21) | (1)
Incurred Claims and Allocated Claims Adjustment Expenses | 1,889 | 1,524 | 1,971
Payments for medical care costs related to: |  |  |
Current year | 1,646 | 1,323 | 1,746
Prior years | 220 | 234 | 343
Total paid | 1,866 | 1,557 | 2,089
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 | $ 251 | $ 228 | $ 261

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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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