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Non-consolidated variable interest entities - Additional Information (Details) - Variable Interest Entity Not Primary Beneficiary [Member] $ in Billions	9 Months Ended
	Sep. 30, 2024 USD ($) NumberOfVIE	Dec. 31, 2023 USD ($)
Variable Interest Entity [Line Items]
Number of VIEs \| NumberOfVIE	3
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement \| $	$ 6.7	$ 7.2

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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