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Reinsurance - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jan. 02, 2025 | Dec. 31, 2024
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Insurance [Abstract] |  |  |
Contract owner account balance uncer coinsurance |  | $ 3,800 |
Separate accounts liability under coinsurance |  | $ 20,600 |
Deposit asset | $ 900 |  | $ 1,100
Funds withheld, funds held under reinsurance agreements, liability, direct | 107 |  | $ 103
Funds held under reinsurance agreements, liability, assumed | $ 900 |  |

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- Definition Carrying amount of assets as of the balance sheet date pertaining to amounts paid by the insured (including a ceding company) under insurance or reinsurance contracts for which insurance risk is not transferred. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483081/340-30-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 340 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483054/340-30-50-1 + Details
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- References No definition available. + Details
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- Definition Contract Owner account balance uncer coinsurance + References No definition available. + Details
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- Definition Funds Held under Reinsurance Agreements, Liability, Assumed + References No definition available. + Details
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- Definition Funds Withheld, Funds Held under Reinsurance Agreements, Liability, Direct + References No definition available. + Details
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- Definition Separate accounts liability under coinsurance + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant