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Investments - Credit Loss Expense Incurred (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |
Total intent to sell impairments | $ 0 | $ (1,091) | $ 0
Total credit loss benefit (expense) | (42) | (22) | (15)
Corporate bonds |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |
Total intent to sell impairments | 0 | (941) | 0
Total credit loss benefit (expense) | (21) | (24) | (5)
State and municipal bonds |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |
Total intent to sell impairments | 0 | (48) | 0
RMBS |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |
Total intent to sell impairments | 0 | (28) | 0
Total credit loss benefit (expense) | (1) | 1 | (6)
CMBS |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |
Total intent to sell impairments | 0 | (36) | 0
ABS |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |
Total intent to sell impairments | 0 | (37) | 0
Total credit loss benefit (expense) | (20) | 1 | (4)
Hybrid and redeemable preferred securities |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |
Total intent to sell impairments | $ 0 | $ (1) | $ 0

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- Definition Amount of expense 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), for which no credit loss was previously recorded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Definition Amount of decrease in 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) from intent to sell or more likely than not will be required to sell before recovery of amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-9 + Details
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