v3.20.4
Commitments, Contingencies and Guarantees - Commitments (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Commitment Liabilities [Line Items]    
Total lending $ 171,575 $ 160,090
Risk participations 8,054 7,154
Collateralized agreement 55,278 62,093
Collateralized financing 35,402 10,193
Letters of credit 367 456
Investment 6,456 7,879
Other 7,836 6,135
Total commitments 284,968 254,000
Maturities, Year 1 [Member]    
Commitment Liabilities [Line Items]    
Total lending 41,825  
Risk participations 776  
Collateralized agreement 55,278  
Collateralized financing 35,402  
Letters of credit 319  
Investment 2,309  
Other 7,392  
Total commitments 143,301  
Maturities, Year 2 and Year 3 [Member]    
Commitment Liabilities [Line Items]    
Total lending 59,850  
Risk participations 4,706  
Collateralized agreement  
Collateralized financing  
Letters of credit 7  
Investment 1,484  
Other 84  
Total commitments 66,131  
Maturities, Year 3 and Year 4 [Member]    
Commitment Liabilities [Line Items]    
Total lending 59,691  
Risk participations 2,448  
Collateralized agreement  
Collateralized financing  
Letters of credit  
Investment 1,230  
Other 95  
Total commitments 63,464  
Maturities, Year 5 and Thereafter [Member]    
Commitment Liabilities [Line Items]    
Total lending 10,209  
Risk participations 124  
Collateralized agreement  
Collateralized financing  
Letters of credit 41  
Investment 1,433  
Other 265  
Total commitments 12,072  
Investment Grade Commercial Lending [Member]    
Commitment Liabilities [Line Items]    
Total lending 83,801 87,105
Investment Grade Commercial Lending [Member] | Maturities, Year 1 [Member]    
Commitment Liabilities [Line Items]    
Total lending 14,088  
Investment Grade Commercial Lending [Member] | Maturities, Year 2 and Year 3 [Member]    
Commitment Liabilities [Line Items]    
Total lending 34,054  
Investment Grade Commercial Lending [Member] | Maturities, Year 3 and Year 4 [Member]    
Commitment Liabilities [Line Items]    
Total lending 34,207  
Investment Grade Commercial Lending [Member] | Maturities, Year 5 and Thereafter [Member]    
Commitment Liabilities [Line Items]    
Total lending 1,452  
Non Investment Grade Commercial Lending [Member]    
Commitment Liabilities [Line Items]    
Total lending 56,757 53,735
Non Investment Grade Commercial Lending [Member] | Maturities, Year 1 [Member]    
Commitment Liabilities [Line Items]    
Total lending 3,791  
Non Investment Grade Commercial Lending [Member] | Maturities, Year 2 and Year 3 [Member]    
Commitment Liabilities [Line Items]    
Total lending 21,631  
Non Investment Grade Commercial Lending [Member] | Maturities, Year 3 and Year 4 [Member]    
Commitment Liabilities [Line Items]    
Total lending 22,578  
Non Investment Grade Commercial Lending [Member] | Maturities, Year 5 and Thereafter [Member]    
Commitment Liabilities [Line Items]    
Total lending 8,757  
Warehouse Financing [Member]    
Commitment Liabilities [Line Items]    
Total lending 9,377 5,581
Warehouse Financing [Member] | Maturities, Year 1 [Member]    
Commitment Liabilities [Line Items]    
Total lending 2,306  
Warehouse Financing [Member] | Maturities, Year 2 and Year 3 [Member]    
Commitment Liabilities [Line Items]    
Total lending 4,165  
Warehouse Financing [Member] | Maturities, Year 3 and Year 4 [Member]    
Commitment Liabilities [Line Items]    
Total lending 2,906  
Warehouse Financing [Member] | Maturities, Year 5 and Thereafter [Member]    
Commitment Liabilities [Line Items]    
Total lending  
Credit cards [Member]    
Commitment Liabilities [Line Items]    
Total lending 21,640 $ 13,669
Credit cards [Member] | Maturities, Year 1 [Member]    
Commitment Liabilities [Line Items]    
Total lending 21,640  
Credit cards [Member] | Maturities, Year 2 and Year 3 [Member]    
Commitment Liabilities [Line Items]    
Total lending  
Credit cards [Member] | Maturities, Year 3 and Year 4 [Member]    
Commitment Liabilities [Line Items]    
Total lending  
Credit cards [Member] | Maturities, Year 5 and Thereafter [Member]    
Commitment Liabilities [Line Items]    
Total lending