Loans - Consumer, Excluding Credit Card Loan Portfolio (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 1,408,905	$ 1,299,590	$ 1,280,870
Consumer, excluding credit card
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	368,741	376,334	$ 397,275
Consumer, excluding credit card | Residential real estate
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	303,531	309,513
Consumer, excluding credit card | Auto and other
Loans and Leases Receivable Disclosure [Line Items]
Retained loans	$ 65,210	$ 66,821