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Intangible Assets and Other Assets, Other Assets (Details) - USD ($) $ in Millions	Mar. 31, 2026	Jan. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Components of Other Assets [Line Items]
Corporate/bank-owned life insurance	$ 19,776		$ 19,757
Accounts receivable	26,355		19,651
Loans held for sale	4,651		4,482
Mortgage servicing rights	6,218		6,327	$ 7,180
Operating lease assets (lessor)	711		4,999
Operating lease right-of-use (ROU) assets (lessee)	3,630		3,641
Other	18,044		15,578
Other assets	86,192		81,297
Railroad transportation equipment [Member]
Components of Other Assets [Line Items]
Loans held for sale		$ 1,000
Railroad transportation equipment [Member] \| Disposal group, held-for-sale, not discontinued operations [Member]
Components of Other Assets [Line Items]
Operating lease assets (lessor)		$ 4,300
AFS and HTM debt securities [Member]
Components of Other Assets [Line Items]
Interest receivable	1,537		1,660
Loans [Member]
Components of Other Assets [Line Items]
Interest receivable	3,394		3,330
Trading and other [Member]
Components of Other Assets [Line Items]
Interest receivable	$ 1,876		$ 1,872