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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 | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivatives not designated as hedges, gains (losses) included in net earnings | $ 16 | $ 1 | $ 9 | $ 6
Earnings (losses) on derivatives | 14 | (6) | 4 | (8)
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 | 0 | 0 | 1 | (1)
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 | 7 | 1 | 2 | 1
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 | 0 | 6 | 6
Designated as hedging instrument | Interest rate swaps | Net investment income |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Reclassification from accumulated other comprehensive income | $ (2) | $ (7) | $ (5) | $ (14)

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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://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 182 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-182 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-21 + Details
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