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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 | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 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 | $ 722 | $ 1,929 | $ 3,077 | $ 1,128
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 | (1) | (5) | (1) | 1
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 | (1) | (13) | (3) | (29)
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) | (5) | (3) | (3)
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 | (8) | 0 | 8 | (2)
MRBs |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Changes in unrealized gains (losses) included in net income | 127 | 2,007 | 2,022 | 1,369
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 | 228 | 0 | 469 | 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 | $ 379 | $ (55) | $ 585 | $ (208)

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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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