Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Billions	Jun. 30, 2026	Dec. 31, 2025
Cash and Cash Equivalents [Line Items]
Cash and due from banks	$ 2.5	$ 2.4
Russia
Cash and Cash Equivalents [Line Items]
Cash and due from banks	$ 1.7	$ 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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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