v3.21.2
Commitments, Contingencies and Guarantees - Commitments (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Commitment Liabilities [Line Items]    
Total lending $ 214,532 $ 171,575
Risk participations 9,992 8,054
Collateralized agreement 110,163 55,278
Collateralized financing 34,366 35,402
Letters of credit 375 367
Investment 12,625 6,456
Other 9,909 7,836
Total commitments 391,962 284,968
Maturities, Year 1 [Member]    
Commitment Liabilities [Line Items]    
Total lending 38,000  
Risk participations 380  
Collateralized agreement 99,421  
Collateralized financing 34,114  
Letters of credit 160  
Investment 5,394  
Other 8,722  
Total commitments 186,191  
Maturities, Year 2 and Year 3 [Member]    
Commitment Liabilities [Line Items]    
Total lending 59,324  
Risk participations 4,976  
Collateralized agreement 10,571  
Collateralized financing 251  
Letters of credit 169  
Investment 4,106  
Other 1,144  
Total commitments 80,541  
Maturities, Year 3 and Year 4 [Member]    
Commitment Liabilities [Line Items]    
Total lending 61,362  
Risk participations 3,224  
Collateralized agreement 168  
Collateralized financing 0  
Letters of credit 0  
Investment 1,566  
Other 33  
Total commitments 66,353  
Maturities, Year 5 and Thereafter [Member]    
Commitment Liabilities [Line Items]    
Total lending 55,846  
Risk participations 1,412  
Collateralized agreement 3  
Collateralized financing 1  
Letters of credit 46  
Investment 1,559  
Other 10  
Total commitments 58,877  
Investment Grade Commercial Lending [Member]    
Commitment Liabilities [Line Items]    
Total lending 97,902 83,801
Investment Grade Commercial Lending [Member] | Maturities, Year 1 [Member]    
Commitment Liabilities [Line Items]    
Total lending 2,981  
Investment Grade Commercial Lending [Member] | Maturities, Year 2 and Year 3 [Member]    
Commitment Liabilities [Line Items]    
Total lending 35,540  
Investment Grade Commercial Lending [Member] | Maturities, Year 3 and Year 4 [Member]    
Commitment Liabilities [Line Items]    
Total lending 34,512  
Investment Grade Commercial Lending [Member] | Maturities, Year 5 and Thereafter [Member]    
Commitment Liabilities [Line Items]    
Total lending 24,869  
Non Investment Grade Commercial Lending [Member]    
Commitment Liabilities [Line Items]    
Total lending 74,111 56,757
Non Investment Grade Commercial Lending [Member] | Maturities, Year 1 [Member]    
Commitment Liabilities [Line Items]    
Total lending 3,300  
Non Investment Grade Commercial Lending [Member] | Maturities, Year 2 and Year 3 [Member]    
Commitment Liabilities [Line Items]    
Total lending 18,719  
Non Investment Grade Commercial Lending [Member] | Maturities, Year 3 and Year 4 [Member]    
Commitment Liabilities [Line Items]    
Total lending 22,195  
Non Investment Grade Commercial Lending [Member] | Maturities, Year 5 and Thereafter [Member]    
Commitment Liabilities [Line Items]    
Total lending 29,897  
Warehouse Financing [Member]    
Commitment Liabilities [Line Items]    
Total lending 10,801 9,377
Warehouse Financing [Member] | Maturities, Year 1 [Member]    
Commitment Liabilities [Line Items]    
Total lending 1  
Warehouse Financing [Member] | Maturities, Year 2 and Year 3 [Member]    
Commitment Liabilities [Line Items]    
Total lending 5,065  
Warehouse Financing [Member] | Maturities, Year 3 and Year 4 [Member]    
Commitment Liabilities [Line Items]    
Total lending 4,655  
Warehouse Financing [Member] | Maturities, Year 5 and Thereafter [Member]    
Commitment Liabilities [Line Items]    
Total lending 1,080  
Credit cards [Member]    
Commitment Liabilities [Line Items]    
Total lending 31,718 $ 21,640
Credit cards [Member] | Maturities, Year 1 [Member]    
Commitment Liabilities [Line Items]    
Total lending 31,718  
Credit cards [Member] | Maturities, Year 2 and Year 3 [Member]    
Commitment Liabilities [Line Items]    
Total lending 0  
Credit cards [Member] | Maturities, Year 3 and Year 4 [Member]    
Commitment Liabilities [Line Items]    
Total lending 0  
Credit cards [Member] | Maturities, Year 5 and Thereafter [Member]    
Commitment Liabilities [Line Items]    
Total lending $ 0