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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, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Changes in unrealized gains (losses) included in net income | $ 1,148 | $ 722 | $ (82) | $ 3,077
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 | (1) | 0 | (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) | (1) | (7) | (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) | (2) | (2) | (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 | (6) | (8) | (6) | 8
MRBs |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items] |  |  |  |
Changes in unrealized gains (losses) included in net income | 933 | 127 | (367) | 2,022
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 | 14 | 228 | (75) | 469
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 | $ 206 | $ 379 | $ 375 | $ 585

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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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