Commitments, Contingencies and Guarantees - Commitments (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Commitment Liabilities [Line Items]
Total lending	$ 227,138	$ 211,552
Risk participations	9,173	10,016
Collateralized agreement	105,301	101,031
Collateralized financing	22,532	29,561
Investment	7,705	11,381
Other	9,690	9,143
Total commitments	381,539	372,684
Year one
Commitment Liabilities [Line Items]
Total lending	85,344
Risk participations	2,932
Collateralized agreement	104,392
Collateralized financing	21,816
Investment	1,266
Other	9,168
Total commitments	224,918
Years two and three
Commitment Liabilities [Line Items]
Total lending	50,725
Risk participations	3,394
Collateralized agreement	909
Collateralized financing	716
Investment	1,379
Other	285
Total commitments	57,408
2025 - 2026
Commitment Liabilities [Line Items]
Total lending	83,056
Risk participations	2,760
Collateralized agreement	0
Collateralized financing	0
Investment	2,344
Other	0
Total commitments	88,160
2027 - Thereafter
Commitment Liabilities [Line Items]
Total lending	8,013
Risk participations	87
Collateralized agreement	0
Collateralized financing	0
Investment	2,716
Other	237
Total commitments	11,053
Investment-grade commercial lending
Commitment Liabilities [Line Items]
Total lending	97,659	95,585
Investment-grade commercial lending | Year one
Commitment Liabilities [Line Items]
Total lending	14,764
Investment-grade commercial lending | Years two and three
Commitment Liabilities [Line Items]
Total lending	26,601
Investment-grade commercial lending | 2025 - 2026
Commitment Liabilities [Line Items]
Total lending	54,258
Investment-grade commercial lending | 2027 - Thereafter
Commitment Liabilities [Line Items]
Total lending	2,036
Non-investment-grade commercial lending
Commitment Liabilities [Line Items]
Total lending	56,265	69,635
Non-investment-grade commercial lending | Year one
Commitment Liabilities [Line Items]
Total lending	4,850
Non-investment-grade commercial lending | Years two and three
Commitment Liabilities [Line Items]
Total lending	17,875
Non-investment-grade commercial lending | 2025 - 2026
Commitment Liabilities [Line Items]
Total lending	27,601
Non-investment-grade commercial lending | 2027 - Thereafter
Commitment Liabilities [Line Items]
Total lending	5,939
Warehouse financing
Commitment Liabilities [Line Items]
Total lending	9,116	10,391
Warehouse financing | Year one
Commitment Liabilities [Line Items]
Total lending	1,633
Warehouse financing | Years two and three
Commitment Liabilities [Line Items]
Total lending	6,248
Warehouse financing | 2025 - 2026
Commitment Liabilities [Line Items]
Total lending	1,197
Warehouse financing | 2027 - Thereafter
Commitment Liabilities [Line Items]
Total lending	38
Consumer
Commitment Liabilities [Line Items]
Total lending	64,098	$ 35,941
Consumer | Year one
Commitment Liabilities [Line Items]
Total lending	64,097
Consumer | Years two and three
Commitment Liabilities [Line Items]
Total lending	1
Consumer | 2025 - 2026
Commitment Liabilities [Line Items]
Total lending	0
Consumer | 2027 - Thereafter
Commitment Liabilities [Line Items]
Total lending	$ 0