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Investments - Changes in Allowance for Credit Losses on Mortgage Loans on Real Estate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of beginning-of-year | $ 114 |  |
Additions (reductions) from provision for credit loss expense | 88 | $ 16 | $ 3
Balance as of end-of-year | 152 | 114 |
Mortgage loans on real estate |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of beginning-of-year | 114 | 99 | 96
Additions (reductions) from provision for credit loss expense | 88 | 15 | 3
Additions from purchases of PCD mortgage loans on real estate | 0 | 0 | 0
Reductions for mortgage loans on real estate charged off | (50) |  |
Balance as of end-of-year | 152 | 114 | 99
Credit loss expense (reversal) | 1 | (1) | 0
Accrued interest receivable excluded from credit losses | 94 | 68 | 51
Commercial |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of beginning-of-year | 86 |  |
Balance as of end-of-year | 99 | 86 |
Commercial | Mortgage loans on real estate |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of beginning-of-year | 86 | 84 | 79
Additions (reductions) from provision for credit loss expense | 63 | 2 | 5
Additions from purchases of PCD mortgage loans on real estate | 0 | 0 | 0
Reductions for mortgage loans on real estate charged off | (50) |  |
Balance as of end-of-year | 99 | 86 | 84
Residential |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of beginning-of-year | 28 |  |
Balance as of end-of-year | 53 | 28 |
Residential | Mortgage loans on real estate |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance as of beginning-of-year | 28 | 15 | 17
Additions (reductions) from provision for credit loss expense | 25 | 13 | (2)
Additions from purchases of PCD mortgage loans on real estate | 0 | 0 | 0
Reductions for mortgage loans on real estate charged off | 0 |  |
Balance as of end-of-year | $ 53 | $ 28 | $ 15

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- Definition Amount, before 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 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B + 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 decrease in allowance for credit loss on financing receivable from writeoff. 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 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + 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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