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Derivative Instruments - Summary of net realized gains (losses) recorded in the consolidated statements of income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Net realized gains (losses) on derivative instruments |  |  |  |  |
Net realized gains (losses) on derivative instruments | [1] | $ 30 | $ 125 | $ 292 | $ 116
Not designated as hedging instrument |  |  |  |  |
Net realized gains (losses) on derivative instruments |  |  |  |  |
Net realized gains (losses) on derivative instruments |  | 30 | 125 | 292 | 116
Not designated as hedging instrument | Futures contracts |  |  |  |  |
Net realized gains (losses) on derivative instruments |  |  |  |  |
Net realized gains (losses) on derivative instruments |  | 37 | 86 | 176 | 69
Not designated as hedging instrument | Foreign currency forward contracts |  |  |  |  |
Net realized gains (losses) on derivative instruments |  |  |  |  |
Net realized gains (losses) on derivative instruments |  | (12) | 31 | 71 | 32
Not designated as hedging instrument | Other |  |  |  |  |
Net realized gains (losses) on derivative instruments |  |  |  |  |
Net realized gains (losses) on derivative instruments | [2] | $ 5 | $ 8 | $ 45 | $ 15
[1] | See note 10 for information on the Company’s derivative instruments.
[2] | Includes realized gains or losses on swaps, options and other derivatives contracts

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 + Details
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