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Investment Securities - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]
Allowance for credit loss related to held-to-maturity securities	$ 0	$ 0
Investment grade percentage	97.00%	97.00%
Non-agency CMBS
Schedule of Held-to-maturity Securities [Line Items]
Allowance for credit loss related to held-to-maturity securities	$ 62	$ 52

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Debt Securities, Held-to-Maturity, Investment Grade, Percent

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Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity).

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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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