Commitments, Contingencies and Guarantees - Commitments (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Commitment Liabilities [Line Items]
Total lending	$ 222,937	$ 211,552
Risk participations	9,486	10,016
Collateralized agreement	104,691	101,031
Collateralized financing	33,858	29,561
Investment	7,246	11,381
Other	12,514	9,143
Total commitments	390,732	372,684
Remainder of 2022
Commitment Liabilities [Line Items]
Total lending	66,189
Risk participations	243
Collateralized agreement	95,230
Collateralized financing	30,495
Investment	1,110
Other	9,315
Total commitments	202,582
2023 - 2024
Commitment Liabilities [Line Items]
Total lending	48,841
Risk participations	5,852
Collateralized agreement	9,461
Collateralized financing	3,363
Investment	1,325
Other	2,923
Total commitments	71,765
2025 - 2026
Commitment Liabilities [Line Items]
Total lending	67,574
Risk participations	2,261
Collateralized agreement	0
Collateralized financing	0
Investment	509
Other	28
Total commitments	70,372
2027 - Thereafter
Commitment Liabilities [Line Items]
Total lending	40,333
Risk participations	1,130
Collateralized agreement	0
Collateralized financing	0
Investment	4,302
Other	248
Total commitments	46,013
Investment-grade commercial lending
Commitment Liabilities [Line Items]
Total lending	95,229	95,585
Investment-grade commercial lending | Remainder of 2022
Commitment Liabilities [Line Items]
Total lending	3,472
Investment-grade commercial lending | 2023 - 2024
Commitment Liabilities [Line Items]
Total lending	26,957
Investment-grade commercial lending | 2025 - 2026
Commitment Liabilities [Line Items]
Total lending	41,053
Investment-grade commercial lending | 2027 - Thereafter
Commitment Liabilities [Line Items]
Total lending	23,747
Non-investment-grade commercial lending
Commitment Liabilities [Line Items]
Total lending	57,231	69,635
Non-investment-grade commercial lending | Remainder of 2022
Commitment Liabilities [Line Items]
Total lending	2,040
Non-investment-grade commercial lending | 2023 - 2024
Commitment Liabilities [Line Items]
Total lending	15,452
Non-investment-grade commercial lending | 2025 - 2026
Commitment Liabilities [Line Items]
Total lending	23,532
Non-investment-grade commercial lending | 2027 - Thereafter
Commitment Liabilities [Line Items]
Total lending	16,207
Warehouse financing
Commitment Liabilities [Line Items]
Total lending	8,865	10,391
Warehouse financing | Remainder of 2022
Commitment Liabilities [Line Items]
Total lending	0
Warehouse financing | 2023 - 2024
Commitment Liabilities [Line Items]
Total lending	5,497
Warehouse financing | 2025 - 2026
Commitment Liabilities [Line Items]
Total lending	2,989
Warehouse financing | 2027 - Thereafter
Commitment Liabilities [Line Items]
Total lending	379
Consumer
Commitment Liabilities [Line Items]
Total lending	61,612	$ 35,941
Consumer | Remainder of 2022
Commitment Liabilities [Line Items]
Total lending	60,677
Consumer | 2023 - 2024
Commitment Liabilities [Line Items]
Total lending	935
Consumer | 2025 - 2026
Commitment Liabilities [Line Items]
Total lending	0
Consumer | 2027 - Thereafter
Commitment Liabilities [Line Items]
Total lending	$ 0