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Investments - Changes in Allowance for Credit Losses on Mortgage Loans on Real Estate (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance as of beginning-of-year | $ 114,000,000 |
Additions (reductions) from provision for credit loss expense | 0 | $ 4,000,000
Balance as of end-of-year | 115,000,000 |
Accrued interest receivable excluded from credit losses | 69,000,000 | 52,000,000
Mortgage loans on real estate |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance as of beginning-of-year | 114,000,000 | 99,000,000
Additions (reductions) from provision for credit loss expense | 1,000,000 | 4,000,000
Additions from purchases of PCD mortgage loans on real estate | 0 | 0
Balance as of end-of-year | 115,000,000 | 103,000,000
Credit loss expense (reversal) | 1,000,000 | 0
Commercial |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance as of beginning-of-year | 86,000,000 |
Balance as of end-of-year | 84,000,000 |
Commercial | Mortgage loans on real estate |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance as of beginning-of-year | 86,000,000 | 84,000,000
Additions (reductions) from provision for credit loss expense | (2,000,000) | (1,000,000)
Additions from purchases of PCD mortgage loans on real estate | 0 | 0
Balance as of end-of-year | 84,000,000 | 83,000,000
Residential |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance as of beginning-of-year | 28,000,000 |
Balance as of end-of-year | 31,000,000 |
Residential | Mortgage loans on real estate |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance as of beginning-of-year | 28,000,000 | 15,000,000
Additions (reductions) from provision for credit loss expense | 3,000,000 | 5,000,000
Additions from purchases of PCD mortgage loans on real estate | 0 | 0
Balance as of end-of-year | $ 31,000,000 | $ 20,000,000

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- Definition Amount, after allowance for credit loss, of accrued interest on financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3A + Details
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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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- Definition Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 19 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-19 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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