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Investments - Investments - ACL on Fixed Maturities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance | $ 18 | $ 17 | $ 21 | $ 12
Credit losses on fixed maturities where credit losses were not previously recorded | 1 | 2 | 1 | 6
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold | 0 | 2 | 0 | 2
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period | 0 | 1 | 1 | 2
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff |  |  | 4 | 0
Corporate |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance | 6 | 6 | 9 | 2
Credit losses on fixed maturities where credit losses were not previously recorded | 0 | 2 | 0 | 6
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold | 0 | 2 | 0 | 2
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period | 0 | 0 | 1 | 0
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff |  |  | 4 | 0
CMBS |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance | 12 | 11 | 12 | 10
Credit losses on fixed maturities where credit losses were not previously recorded | 1 | 0 | 1 | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Securities Sold | 0 | 0 | 0 | 0
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period | $ 0 | $ 1 | 0 | 2
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Writeoff |  |  | $ 0 | $ 0

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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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