Trading Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Trading Assets and Liabilities [Line Items]
Trading debt securities	$ 120,677	$ 97,302
Equity securities, carried at fair value	22,361	19,841
Loans held for sale	7,275	4,936
Gross derivative assets	69,478	68,095
Derivative assets	17,721	18,223
Gross trading derivative liabilities	72,418	75,488
Derivative liabilities	11,390	18,495
Held for trading at fair value [Member]
Trading Assets and Liabilities [Line Items]
Trading debt securities	120,677	97,302
Equity securities, carried at fair value	20,351	18,449
Loans held for sale	4,551	1,793
Gross derivative assets	72,101	71,990
Netting	(54,537)	(54,069)
Derivative assets	17,564	17,921
Total trading assets	163,143	135,465
Short sale and other liabilities	29,946	25,471
Interest-bearing deposits	1,087	1,297
Long-term debt	3,774	2,308
Gross trading derivative liabilities	73,630	77,807
Netting	(63,032)	(60,366)
Derivative liabilities	10,598	17,441
Total trading liabilities	$ 45,405	$ 46,517