Leases - Information Related to Operating Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Right-of-use assets	$ 8,494	$ 8,431
Lease liabilities	$ 8,900	$ 8,833
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other, Total premises and equipment	Other, Total premises and equipment
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Accounts Payable and Accrued Liabilities	Accounts Payable and Accrued Liabilities
Weighted average remaining lease term (in years)	8 years 3 months 18 days	8 years 4 months 24 days
Weighted average discount rate	4.24%	4.01%
Supplemental cash flow information
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows	$ 1,734	$ 1,662
Supplemental non-cash information
Right-of-use assets obtained in exchange for operating lease obligations	1,565	2,094
Rental expense
Gross rental expense	2,231	2,079
Sublease rental income	(41)	(72)
Net rental expense	$ 2,190	$ 2,007