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Investments - Investments - ACL on Fixed Maturities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance | $ 17 | $ 13 | $ 12 | $ 1
Credit losses on fixed maturities where credit losses were not previously recorded | 2 | 0 | 6 | 12
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period | 1 | 0 | 2 | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance | 18 | 13 | 18 | 13
Reduction due to sales | (2) | 0 | (2) | 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 | 9 | 2 | 1
Credit losses on fixed maturities where credit losses were not previously recorded | 2 | 0 | 6 | 8
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period | 0 | (1) | 0 | (1)
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance | 6 | 8 | 6 | 8
Reduction due to sales | (2) | 0 | (2) | 0
Foreign Govt./Govt. Agencies |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance |  | 3 | 0 | 0
Credit losses on fixed maturities where credit losses were not previously recorded |  | 0 |  | 3
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period |  | 1 |  | 1
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance | 0 | 4 | 0 | 4
Reduction due to sales |  | 0 |  | 0
CMBS |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance | 11 | 1 | 10 | 0
Credit losses on fixed maturities where credit losses were not previously recorded | 0 | 0 | 0 | 1
Net increases (decreases) in allowance on fixed maturities that had an allowance in a previous period | 1 | 0 | 2 | 0
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance | 12 | 1 | 12 | 1
Reduction due to sales | $ 0 | $ 0 | $ 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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