Business Segments - Segment Operating Results (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) Segment	Sep. 30, 2021 USD ($)
Segment Reporting [Abstract]
Number of business segments | Segment			4
Segment Reporting Information [Line Items]
Non-interest revenues	$ 9,932	$ 12,044	$ 31,168	$ 42,025
Net interest income	2,043	1,564	5,604	4,675
Total net revenues	11,975	13,608	36,772	46,700
Provision for credit losses	515	175	1,743	13
Operating expenses	7,704	6,591	23,073	24,668
Pre-tax earnings	3,756	6,842	11,956	22,019
Net earnings	3,069	5,378	9,935	17,700
Net earnings to common	2,962	5,284	9,579	17,342
Average common equity	$ 107,310	$ 93,833	$ 104,715	$ 90,037
Return on average common equity	11.00%	22.50%	12.20%	25.70%
Investment Banking
Segment Reporting Information [Line Items]
Non-interest revenues	$ 1,373	$ 3,599	$ 5,661	$ 10,755
Net interest income	203	101	463	325
Total net revenues	1,576	3,700	6,124	11,080
Provision for credit losses	78	41	325	(229)
Operating expenses	1,038	1,343	3,391	5,161
Pre-tax earnings	460	2,316	2,408	6,148
Net earnings	370	1,831	2,001	4,942
Net earnings to common	355	1,818	1,950	4,890
Average common equity	$ 9,720	$ 10,346	$ 10,649	$ 10,201
Return on average common equity	14.60%	70.30%	24.40%	63.90%
Global Markets
Segment Reporting Information [Line Items]
Non-interest revenues	$ 5,648	$ 4,943	$ 18,770	$ 16,121
Net interest income	553	668	1,770	1,971
Total net revenues	6,201	5,611	20,540	18,092
Provision for credit losses	(43)	(24)	190	(30)
Operating expenses	3,213	2,794	10,340	10,352
Pre-tax earnings	3,031	2,841	10,010	7,770
Net earnings	2,474	2,244	8,318	6,246
Net earnings to common	2,408	2,190	8,102	6,041
Average common equity	$ 57,078	$ 46,959	$ 54,842	$ 44,067
Return on average common equity	16.90%	18.70%	19.70%	18.30%
Asset Management
Segment Reporting Information [Line Items]
Non-interest revenues	$ 1,742	$ 2,174	$ 3,107	$ 11,619
Net interest income	79	105	344	406
Total net revenues	1,821	2,279	3,451	12,025
Provision for credit losses	29	10	129	(2)
Operating expenses	1,565	823	4,121	4,656
Pre-tax earnings	227	1,446	(799)	7,371
Net earnings	195	1,115	(664)	5,925
Net earnings to common	181	1,096	(717)	5,853
Average common equity	$ 24,587	$ 25,788	$ 24,358	$ 25,294
Return on average common equity	2.90%	17.00%	(3.90%)	30.90%
Consumer & Wealth Management
Segment Reporting Information [Line Items]
Non-interest revenues	$ 1,169	$ 1,328	$ 3,630	$ 3,530
Net interest income	1,208	690	3,027	1,973
Total net revenues	2,377	2,018	6,657	5,503
Provision for credit losses	451	148	1,099	274
Operating expenses	1,888	1,631	5,221	4,499
Pre-tax earnings	38	239	337	730
Net earnings	30	188	280	587
Net earnings to common	18	180	244	558
Average common equity	$ 15,925	$ 10,740	$ 14,866	$ 10,475
Return on average common equity	0.50%	6.70%	2.20%	7.10%