Securitization Activities - Firms Continuing Involvement in Securitization Entities to Which Firm Sold Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding Principal Amount	$ 134,130	$ 115,351
Retained Interests	5,043	3,552
Purchased Interests	245	266
Fair value of retained interests	5,030	3,570
U.S. government agency-issued CMOs
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding Principal Amount	38,617	33,984
Retained Interests	1,835	955
Purchased Interests	0	3
Other residential mortgage-backed
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding Principal Amount	27,075	23,262
Retained Interests	1,461	1,114
Purchased Interests	117	96
Other commercial mortgage-backed
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding Principal Amount	59,688	50,350
Retained Interests	1,349	1,123
Purchased Interests	82	130
Corporate debt and other asset-backed
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]
Outstanding Principal Amount	8,750	7,755
Retained Interests	398	360
Purchased Interests	$ 46	$ 37