Intangible Assets and Other Assets, Other Assets (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Components of Other Assets [Line Items]
Corporate/bank-owned life insurance	$ 19,734	$ 19,705
Accounts receivable	28,977	30,541
Operating lease assets (lessor)	5,350	5,558
Operating lease ROU assets (lessee)	3,672	3,412
Other	14,219	12,839
Total other assets	78,588	78,815
AFS and HTM debt securities [Member]
Components of Other Assets [Line Items]
Interest receivable	1,599	1,616
Loans [Member]
Components of Other Assets [Line Items]
Interest receivable	3,642	3,933
Trading and other [Member]
Components of Other Assets [Line Items]
Interest receivable	$ 1,395	$ 1,211