Fair Value Option - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) yr	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) yr	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) yr
Fair Value [Line Items]
Total contractual amount of unfunded commitments for which the fair value option was elected	$ 574		$ 574		$ 611
Net gain/(loss) attributable to changes in instrument-specific credit spreads on loans and lending commitments for which the fair value option was elected	(75)	$ 87	(182)	$ 290
Unsecured long-term borrowings
Fair Value [Line Items]
Difference between aggregate contractual principal amount of long-term debt instruments for which the fair value option was elected and related fair value	$ 6,260		$ 6,260		$ 0
Minimum | Other secured financings | Level 3 | Yield
Fair Value [Line Items]
Other secured financing measurement input	0.035		0.035		0.013
Minimum | Other secured financings | Level 3 | Duration (years)
Fair Value [Line Items]
Other secured financing measurement input | yr	0.9		0.9		0.6
Maximum | Other secured financings | Level 3 | Yield
Fair Value [Line Items]
Other secured financing measurement input	0.083		0.083		0.064
Maximum | Other secured financings | Level 3 | Duration (years)
Fair Value [Line Items]
Other secured financing measurement input | yr	4.3		4.3		7.1
Weighted Average | Other secured financings | Level 3 | Yield
Fair Value [Line Items]
Other secured financing measurement input	0.047		0.047		0.021
Weighted Average | Other secured financings | Level 3 | Duration (years)
Fair Value [Line Items]
Other secured financing measurement input | yr	2.5		2.5		3.7
Other Financial Liabilities
Fair Value [Line Items]
Net realized and unrealized gains/(losses) on liabilities	$ 1,450	638	$ 5,760	434
Net realized gains/(losses) on liabilities	(90)	(181)	(222)	(388)
Net unrealized gains/(losses)	1,538	819	5,977	822
Net realized gains/(losses) included in earnings	(90)	(181)	(222)	(388)
Other Financial Liabilities | Unsecured long-term borrowings
Fair Value [Line Items]
Net unrealized gains/(losses)	1,034	289	4,028	348
Net realized gains/(losses) included in earnings	(23)	(64)	(71)	(196)
Other Financial Liabilities | Other secured financings
Fair Value [Line Items]
Net unrealized gains/(losses)	86	30	177	71
Net realized gains/(losses) included in earnings	(13)	3	(18)	(1)
Other Financial Liabilities | Debt valuation adjustment
Fair Value [Line Items]
Net realized gains/(losses) included in comprehensive income	262	25	924	33
Other Financial Liabilities | Market making
Fair Value [Line Items]
Net realized gains/(losses) included in earnings	1,130	599	4,690	366
Other Financial Liabilities | Other principal transactions
Fair Value [Line Items]
Net realized gains/(losses) included in earnings	69	19	155	49
Other Financial Liabilities | Interest expense
Fair Value [Line Items]
Net realized gains/(losses) included in earnings	(7)	$ (5)	(14)	$ (14)
Written loan commitment, fair value option
Fair Value [Line Items]
Fair value of unfunded commitments for which the fair value option was elected	17		17		$ 20
Secured long term borrowings
Fair Value [Line Items]
Difference between aggregate contractual principal amount of long-term debt instruments for which the fair value option was elected and related fair value	$ 201		$ 201		$ 0