Available for sale securities amortized cost excluding accrued interest.

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Number of securities met criteria of credit loss event.

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Number of securities with market values below cost basis.

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No definition available.

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Amount of allowance for credit loss of accounts and financing receivables. Includes, but is not limited to, notes and loan receivable.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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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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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Securities (Narrative) (Details)	1 Months Ended	3 Months Ended
Securities (Narrative) (Details)	Jan. 31, 2026 USD ($)	Mar. 31, 2026 USD ($) Security	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($) Security
Debt and Equity Securities, FV-NI [Line Items]
Securities with an aggregate fair value		$ 4,468,133,000		$ 4,226,864,000
Securities available for sale, amortized cost		6,287,446,000		6,341,322,000
Securities classified as trading		0		$ 0
Restructuring costs	$ 1,500,000,000
Net realized loss	$ (50,400,000)	(98,595,000)	$ 0
Allowance for credit loss		$ 0
Securities that met the criteria of a credit loss event \| Security		0
Number of securities with market values below their cost basis \| Security		592		604
Asset Pledged as Collateral without Right [Member]
Debt and Equity Securities, FV-NI [Line Items]
Securities pledged as collateral		$ 3,500,000,000		$ 3,900,000,000
Available for Sale and Held to Maturity [Member]
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost of securities excluding accrued interest		$ 33,600,000		$ 31,700,000