Loans - Consumer, Excluding Credit Card Loan Portfolio, Residential Real Estate, Active and Suspended Foreclosure (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Financing Receivable, Past Due [Line Items]
Carrying value	$ 1,425,236	$ 1,408,905	$ 1,300,990
Consumer, excluding credit card
Financing Receivable, Past Due [Line Items]
Carrying value	367,274	368,741	$ 372,892
Consumer, excluding credit card | Residential real estate
Financing Receivable, Past Due [Line Items]
Carrying value	301,947	303,531
Consumer, excluding credit card | Residential real estate | In process of active or suspended foreclosure
Financing Receivable, Past Due [Line Items]
Carrying value	$ 546	$ 575