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Non-consolidated variable interest entities - Additional Information (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) NumberOfVIE | Dec. 31, 2023 USD ($)
Variable Interest Entity [Line Items] |  |
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement | $ 44 | $ 50
Variable Interest Entity Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Number of VIEs | NumberOfVIE | 3 |
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement | $ 6,600 | $ 7,200

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