Loans - Wholesale Loan Portfolio, Nonaccrual Loans (Details) - Wholesale - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Nonaccrual [Line Items]
With an allowance	$ 2,395	$ 2,283
Without an allowance	2,003	1,659
Total nonaccrual loans	4,398	3,942
Interest income on nonaccrual loans recognized on a cash basis	0	51
Secured by real estate
Financing Receivable, Nonaccrual [Line Items]
With an allowance	365	366
Without an allowance	1,313	1,073
Total nonaccrual loans	1,678	1,439
Commercial and industrial
Financing Receivable, Nonaccrual [Line Items]
With an allowance	1,562	1,362
Without an allowance	392	398
Total nonaccrual loans	1,954	1,760
Other
Financing Receivable, Nonaccrual [Line Items]
With an allowance	468	555
Without an allowance	298	188
Total nonaccrual loans	$ 766	$ 743