Commitments, Contingent Liabilities, and Guarantees - Commitments to Extend Credit or Funding (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Guarantor Obligations [Line Items]
Total loan commitments	$ 75,009	$ 75,085
Commercial letters of credit	63	65
Purchase card commitments	1,048	995
Principal investing commitments	1	1
Tax credit investment commitments	1,362	1,361
Total loan and other commitments	77,483	77,507
Commercial and other
Guarantor Obligations [Line Items]
Total loan commitments	57,010	55,603
Commercial real estate and construction
Guarantor Obligations [Line Items]
Total loan commitments	2,855	3,440
Home equity
Guarantor Obligations [Line Items]
Total loan commitments	8,360	8,984
Credit cards
Guarantor Obligations [Line Items]
Total loan commitments	$ 6,784	$ 7,058