Commitments and Contingencies - Pledged Assets (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Pledged loans:	$ 323,930	$ 328,595
Asset Pledged as Collateral
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Pledged securities	36,457	40,144
Federal Reserve
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Unused borrowing capacity:	82,663	84,160
Federal Reserve \| Asset Pledged as Collateral
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Pledged loans:	105,025	108,214
FHLB
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Unused borrowing capacity:	24,414	23,464
FHLB \| Asset Pledged as Collateral
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Pledged loans:	$ 75,632	$ 74,767

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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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