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Fair Value of Financial Instruments - Changes in Unrealized Gains (Losses) Within Level 3 Financial Instruments Carried at Fair Value and Still Held (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Changes in unrealized gains (losses) included in net income | $ 33 | $ 1,397 | $ 3,374 | $ 2,513
Trading securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Changes in unrealized gains (losses) included in net income | 7 | (3) | 6 | (2)
Equity securities |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Changes in unrealized gains (losses) included in net income | 0 | 12 | (2) | (17)
Mortgage loans on real estate |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Changes in unrealized gains (losses) included in net income | 2 | 2 | (2) | (1)
Derivative investments |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Changes in unrealized gains (losses) included in net income | 5 | (25) | 14 | (27)
MRBs |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Changes in unrealized gains (losses) included in net income | (665) | 1,415 | 1,357 | 2,783
Reinsurance-related embedded derivatives |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Changes in unrealized gains (losses) included in net income | 661 | 0 | 1,246 | 0
Indexed annuity ceded embedded derivatives |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Changes in unrealized gains (losses) included in net income | $ 23 | $ (4) | $ 755 | $ (223)

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- Definition Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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