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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
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Mar. 31, 2025 | Mar. 31, 2024
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |
Changes in unrealized gains (losses) included in net income | $ (1,217) | $ 2,356
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 | (3) | 0
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 | (6) | (3)
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 | (1) | 0
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 | 12 | 16
MRBs |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |
Changes in unrealized gains (losses) included in net income | (1,299) | 1,896
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 | (89) | 206
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 | $ 169 | $ 241

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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 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: 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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