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Derivative instruments - Contracts Falling under Early Termination Provisions (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Credit Derivatives [Line Items] |  |
Aggregate fair value of OTC derivatives in net liability positions | $ 1,070 | $ 2,163
Collateral posted | 1,564 | 1,940
A3 | A- |  |
Credit Derivatives [Line Items] |  |
Aggregate fair value of OTC derivatives in net liability positions | 6 | 40
Baa2 | BBB |  |
Credit Derivatives [Line Items] |  |
Aggregate fair value of OTC derivatives in net liability positions | 73 | 646
Ba1 | BB+ and lower |  |
Credit Derivatives [Line Items] |  |
Aggregate fair value of OTC derivatives in net liability positions | $ 1,162 | $ 2,710

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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 185 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-185 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4H -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4H + Details
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