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Investments - Credit Loss Expense Incurred (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total credit loss benefit (expense) | $ (17) | $ (16) | $ (33) | $ (17)
Realized Gain (Loss) |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total credit loss benefit (expense) | (19) | (23) | (47) | (25)
Corporate bonds |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total credit loss benefit (expense) | (17) | (1) | (25) | (2)
Corporate bonds | Realized Gain (Loss) |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total credit loss benefit (expense) | (21) | (8) | (30) | (10)
RMBS |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
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 | 2 | 0
ABS |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total credit loss benefit (expense) | 0 | (15) | (8) | (15)
ABS | Realized Gain (Loss) |  |  |  |
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items] |  |  |  |
Total credit loss benefit (expense) | $ 1 | $ (15) | $ (19) | $ (15)

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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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + 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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