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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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