Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Cash and Cash Equivalents [Line Items]
Cash and due from banks, amount inaccessible	$ 1,900	$ 1,300
RUSSIA
Cash and Cash Equivalents [Line Items]
Cash and due from banks, amount inaccessible	$ 1,500	$ 767

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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