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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, 2024 | Sep. 30, 2023
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | $ 4,204 | $ 3,528
Components of medical care costs related to: |  |
Current year | 26,050 | 21,573
Prior years | (625) | (358)
Total medical care costs | 25,425 | 21,215
Payments for medical care costs related to: |  |
Current year | 22,172 | 18,228
Prior years | 3,215 | 2,707
Total paid | 25,387 | 20,935
Acquired balances, net of post-acquisition adjustments | 463 | 96
Change in non-risk and other payables | 27 | 331
Medical claims and benefits payable, ending balance | 4,732 | 4,235
Medicaid |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 3,444 | 2,815
Components of medical care costs related to: |  |
Current year | 20,903 | 17,630
Prior years | (553) | (327)
Total medical care costs | 20,350 | 17,303
Payments for medical care costs related to: |  |
Current year | 17,813 | 14,961
Prior years | 2,256 | 2,074
Total paid | 20,069 | 17,035
Acquired balances, net of post-acquisition adjustments | 0 | 83
Change in non-risk and other payables | 27 | 335
Medical claims and benefits payable, ending balance | 3,752 | 3,501
Medicare |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 532 | 452
Components of medical care costs related to: |  |
Current year | 3,798 | 2,811
Prior years | (70) | (6)
Total medical care costs | 3,728 | 2,805
Payments for medical care costs related to: |  |
Current year | 3,237 | 2,340
Prior years | 742 | 424
Total paid | 3,979 | 2,764
Acquired balances, net of post-acquisition adjustments | 463 | 13
Change in non-risk and other payables | 0 | (4)
Medical claims and benefits payable, ending balance | 744 | 502
Marketplace |  |
Insurance Claims |  |
Medical claims and benefits payable, beginning balance | 228 | 261
Components of medical care costs related to: |  |
Current year | 1,349 | 1,132
Prior years | (2) | (25)
Total medical care costs | 1,347 | 1,107
Payments for medical care costs related to: |  |
Current year | 1,122 | 927
Prior years | 217 | 209
Total paid | 1,339 | 1,136
Acquired balances, net of post-acquisition adjustments | 0 | 0
Change in non-risk and other payables | 0 | 0
Medical claims and benefits payable, ending balance | $ 236 | $ 232

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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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