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Medical Claims Liability - Schedule of Change in Medical Claims Liability (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Beginning balance | $ 20,544 | $ 18,308
Less: Reinsurance recoverable | 76 | 65
Beginning balance | 20,468 | 18,243
Incurred related to: |  |
Current year | 39,497 | 37,458
Prior years | (1,194) | (1,133)
Total incurred | 38,303 | 36,325
Paid related to: |  |
Current year | 25,368 | 23,329
Prior years | 12,858 | 11,570
Total paid | 38,226 | 34,899
Plus: Premium deficiency reserve |  | 178
Ending balance | 20,545 | 19,847
Plus: Reinsurance recoverable | 82 | 64
Ending balance | 20,627 | 19,911
Medicaid |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Beginning balance | 10,375 | 10,299
Less: Reinsurance recoverable | 16 | 18
Beginning balance | 10,359 | 10,281
Incurred related to: |  |
Current year | 22,608 | 21,419
Prior years | (653) | (576)
Total incurred | 21,955 | 20,843
Paid related to: |  |
Current year | 14,092 | 12,996
Prior years | 6,820 | 6,849
Total paid | 20,912 | 19,845
Plus: Premium deficiency reserve |  | 0
Ending balance | 11,402 | 11,279
Plus: Reinsurance recoverable | 14 | 18
Ending balance | 11,416 | 11,297
Medicare |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Beginning balance | 4,401 | 3,358
Less: Reinsurance recoverable | 0 | 0
Beginning balance | 4,401 | 3,358
Incurred related to: |  |
Current year | 9,013 | 7,553
Prior years | (241) | (176)
Total incurred | 8,772 | 7,377
Paid related to: |  |
Current year | 6,397 | 5,243
Prior years | 2,710 | 1,923
Total paid | 9,107 | 7,166
Plus: Premium deficiency reserve |  | 178
Ending balance | 4,066 | 3,747
Plus: Reinsurance recoverable |  | 0
Ending balance | 4,066 | 3,747
Commercial |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Beginning balance | 5,683 | 4,463
Less: Reinsurance recoverable | 60 | 47
Beginning balance | 5,623 | 4,416
Incurred related to: |  |
Current year | 7,490 | 7,972
Prior years | (292) | (365)
Total incurred | 7,198 | 7,607
Paid related to: |  |
Current year | 4,521 | 4,731
Prior years | 3,252 | 2,648
Total paid | 7,773 | 7,379
Plus: Premium deficiency reserve |  | 0
Ending balance | 5,048 | 4,644
Plus: Reinsurance recoverable | 68 | 46
Ending balance | 5,116 | 4,690
Other |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Beginning balance | 85 | 188
Less: Reinsurance recoverable | 0 | 0
Beginning balance | 85 | 188
Incurred related to: |  |
Current year | 386 | 514
Prior years | (8) | (16)
Total incurred | 378 | 498
Paid related to: |  |
Current year | 358 | 359
Prior years | 76 | 150
Total paid | 434 | 509
Plus: Premium deficiency reserve |  | 0
Ending balance | 29 | 177
Plus: Reinsurance recoverable |  | 0
Ending balance | $ 29 | $ 177

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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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