Variable interest entities and asset securitizations - Summary of Carrying Amount (Details) - Variable Interest Entity Primary Beneficiary - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Affordable Housing Projects
Variable Interest Entity [Line Items]
Investment in partnership carrying amount	$ 1,819	$ 1,867
Unfunded commitments includes carrying amount of its investments	859	889
Contingent commitments to provide additional capital contributions to partnerships	109	109
Renewable Energy
Variable Interest Entity [Line Items]
Investment in partnership carrying amount	70	67
Unfunded commitments includes carrying amount of its investments	35	66
Other Projects
Variable Interest Entity [Line Items]
Investment in partnership carrying amount	46	33
Unfunded commitments includes carrying amount of its investments	$ 0	$ 0

- 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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