Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Billions	Mar. 31, 2026	Dec. 31, 2025
Cash and Cash Equivalents [Line Items]
Cash and due from banks	$ 2.4	$ 2.4
Russia
Cash and Cash Equivalents [Line Items]
Cash and due from banks	$ 1.6	$ 1.6

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.

No definition available.

Name:	us-gaap_CashAndCashEquivalentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration