Business Segments - Segment Operating Results (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) Segment	Sep. 30, 2022 USD ($)
Segment Reporting [Abstract]
Number of business segments | Segment			3
Segment Reporting Information [Line Items]
Non-interest revenues	$ 10,270	$ 9,932	$ 29,924	$ 31,168
Net interest income	1,547	2,043	5,012	5,604
Total net revenues	11,817	11,975	34,936	36,772
Provision for credit losses	7	515	451	1,743
Operating expenses	9,054	7,704	26,000	23,073
Pre-tax earnings	2,756	3,756	8,485	11,956
Net earnings	2,058	3,069	6,508	9,935
Net earnings to common	1,882	2,962	6,040	9,579
Average common equity	$ 105,345	$ 107,310	$ 105,834	$ 104,715
Return on average common equity	7.10%	11.00%	7.60%	12.20%
Global Banking & Markets
Segment Reporting Information [Line Items]
Non-interest revenues	$ 7,838	$ 6,933	$ 22,922	$ 24,156
Net interest income	171	631	720	1,812
Total net revenues	8,009	7,564	23,642	25,968
Provision for credit losses	29	63	214	462
Operating expenses	4,791	4,224	13,702	13,628
Pre-tax earnings	3,189	3,277	9,726	11,878
Net earnings	2,383	2,668	7,460	9,870
Net earnings to common	2,250	2,586	7,108	9,602
Average common equity	$ 72,517	$ 71,850	$ 70,968	$ 70,006
Return on average common equity	12.40%	14.40%	13.40%	18.30%
Asset & Wealth Management
Segment Reporting Information [Line Items]
Non-interest revenues	$ 2,544	$ 3,085	$ 7,100	$ 7,210
Net interest income	686	948	2,393	2,605
Total net revenues	3,230	4,033	9,493	9,815
Provision for credit losses	51	(13)	(499)	339
Operating expenses	3,005	2,955	9,448	8,187
Pre-tax earnings	174	1,091	544	1,289
Net earnings	129	905	417	1,071
Net earnings to common	93	882	318	990
Average common equity	$ 28,601	$ 31,516	$ 30,806	$ 31,238
Return on average common equity	1.30%	11.20%	1.40%	4.20%
Platform Solutions
Segment Reporting Information [Line Items]
Non-interest revenues	$ (112)	$ (86)	$ (98)	$ (198)
Net interest income	690	464	1,899	1,187
Total net revenues	578	378	1,801	989
Provision for credit losses	(73)	465	736	942
Operating expenses	1,258	525	2,850	1,258
Pre-tax earnings	(607)	(612)	(1,785)	(1,211)
Net earnings	(454)	(504)	(1,369)	(1,006)
Net earnings to common	(461)	(506)	(1,386)	(1,013)
Average common equity	$ 4,227	$ 3,944	$ 4,060	$ 3,471
Return on average common equity	(43.60%)	(51.30%)	(45.50%)	(38.90%)