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Health Care Costs Payable - Components of Change in Health Care Costs Payable (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |
Health care costs payable, beginning of the period | $ 15,064 | $ 12,049
Less: Reinsurance recoverables | 81 | 5
Less: Impact of discount rate on long-duration insurance reserves | (1) | (23)
Health care costs payable, beginning of the period, net | 14,984 | 12,067
Add: Components of incurred health care costs |  |
Current year | 93,496 | 85,541
Prior years | (1,926) | (845)
Total incurred health care costs | 91,570 | 84,696
Less: Claims paid |  |
Current year | 79,687 | 71,356
Prior years | 11,567 | 10,886
Total claims paid | 91,254 | 82,242
Health care costs payable, end of the period, net | 15,300 | 14,521
Add: Premium deficiency reserves | 728 | 670
Add: Reinsurance recoverables | 94 | 65
Add: Impact of discount rate on long-duration insurance reserves | (24) | (19)
Health care costs payable, end of the period | 16,098 | 15,237
Health Care Benefits |  |
Less: Claims paid |  |
Benefit costs recorded in other insurance liabilities | 41 | 70
Corporate/ Other |  |
Less: Claims paid |  |
Benefit costs recorded in other insurance liabilities | $ 133 | $ 142

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in expected future policy benefit component of liability for future policy benefit from change in discount rate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-13I Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-29E Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + Details
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