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Investments - Credit Loss Expense Incurred (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total intent to sell impairments | $ 0 | $ (467) | $ 0 | $ (1,091)
Total credit loss benefit (expense) | (7) | (1) | (23) | (21)
Realized Gain (Loss) |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total credit loss benefit (expense) | (14) | (1) | (40) | (17)
Corporate bonds |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total intent to sell impairments | 0 | (422) | 0 | (941)
Total credit loss benefit (expense) | (6) | (1) | (8) | (21)
Corporate bonds | Realized Gain (Loss) |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total credit loss benefit (expense) | (9) | (1) | (20) | (18)
State and municipal bonds |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total intent to sell impairments | 0 | (28) | 0 | (48)
RMBS |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total intent to sell impairments | 0 | (9) | 0 | (28)
Total credit loss benefit (expense) | 0 | 0 | 0 | 0
RMBS | Realized Gain (Loss) |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total credit loss benefit (expense) | (1) | 0 | (1) | 1
CMBS |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total intent to sell impairments | 0 | (5) | 0 | (36)
ABS |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total intent to sell impairments | 0 | (2) | 0 | (37)
Total credit loss benefit (expense) | (1) | 0 | (15) | 0
ABS | Realized Gain (Loss) |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total credit loss benefit (expense) | (4) | 0 | (19) | 0
Hybrid and redeemable preferred securities |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total intent to sell impairments | $ 0 | $ (1) | $ 0 | $ (1)

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- Definition Amount, excluding accrued interest, of credit loss expense on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with no credit loss 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, excluding accrued interest, 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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