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Derivatives - Gains (losses) included in the Statement of Earnings for changes in the fair value of derivatives (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivatives not designated as hedges, gains (losses) included in net earnings | $ 25 | $ 7 | $ (17)
Earnings (losses) on derivatives | 1 | (19) | (17)
Fixed maturities with embedded derivatives | Net investment income |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivatives not designated as hedges, gains (losses) included in net earnings | 17 | (4) | 0
Fixed maturities with embedded derivatives | Realized gains (losses) on securities |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivatives not designated as hedges, gains (losses) included in net earnings | (1) | (2) | (12)
Total return swap | Other expenses |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivatives not designated as hedges, gains (losses) included in net earnings | 9 | 13 | (5)
Designated as hedging instrument | Interest rate swaps | Net investment income |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Reclassification from accumulated other comprehensive income | $ (24) | $ (26) | $ 0

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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