Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate, Active and Suspended Foreclosure (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Financing Receivable, Past Due [Line Items]
Carrying value	$ 1,369,785	$ 1,299,590	$ 1,285,370
Consumer, excluding credit card
Financing Receivable, Past Due [Line Items]
Carrying value	369,859	376,334	$ 377,938
Consumer, excluding credit card | Residential real estate
Financing Receivable, Past Due [Line Items]
Carrying value	303,836	309,513
Consumer, excluding credit card | Residential real estate | In process of active or suspended foreclosure
Financing Receivable, Past Due [Line Items]
Carrying value	$ 541	$ 576