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Derivative instruments - Impact of Hedging Derivatives Used in Net Investment Hedging Relationships (Details) - FX contracts - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain or (loss) recognized in accumulated OCI on derivatives | $ 168 | $ (735) | $ (391) | $ (943) | $ (106)
Investment and other revenue |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain or (loss) reclassified from accumulated OCI into income | $ 0 | $ 0 | $ 0 | $ 21 | $ 0

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