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Loans - Commercial Banking: Risk Profile by Internal Risk Rating (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]      
Total Loans $ 248,223 $ 265,809 $ 249,355
Loans under Paycheck Protection Program 242    
Commercial Banking      
Financing Receivable, Allowance for Credit Loss [Line Items]      
2020 11,004    
2019 14,821    
2018 8,972    
2017 5,474    
2016 4,344    
Prior 10,484    
Total Term Loans 55,099    
Revolving Loans 20,570    
Revolving Loans Converted to Term 225    
Total Loans 75,894 $ 74,508  
Internal Risk, Percentage   100.00%  
Commercial Banking | PCI loans      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Total Loans   $ 31  
Internal Risk, Percentage   0.00%  
Commercial Banking | Noncriticized      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Total Loans   $ 71,848  
Internal Risk, Percentage   96.50%  
Commercial Banking | Criticized | Criticized performing      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Total Loans   $ 2,181  
Internal Risk, Percentage   2.90%  
Commercial Banking | Criticized | Criticized nonperforming      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Total Loans   $ 448  
Internal Risk, Percentage   0.60%  
Commercial Banking | Commercial and multifamily real estate      
Financing Receivable, Allowance for Credit Loss [Line Items]      
2020 3,234    
2019 5,648    
2018 3,894    
2017 2,122    
2016 2,263    
Prior 6,828    
Total Term Loans 23,989    
Revolving Loans 7,208    
Revolving Loans Converted to Term 0    
Total Loans 31,197 $ 30,245  
Internal Risk, Percentage   100.00%  
Commercial Banking | Commercial and multifamily real estate | PCI loans      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Total Loans   $ 21  
Internal Risk, Percentage   0.10%  
Commercial Banking | Commercial and multifamily real estate | Noncriticized      
Financing Receivable, Allowance for Credit Loss [Line Items]      
2020 3,017    
2019 5,267    
2018 3,426    
2017 1,796    
2016 1,972    
Prior 5,756    
Total Term Loans 21,234    
Revolving Loans 7,152    
Revolving Loans Converted to Term 0    
Total Loans 28,386 $ 29,625  
Internal Risk, Percentage   97.90%  
Commercial Banking | Commercial and multifamily real estate | Criticized | Criticized performing      
Financing Receivable, Allowance for Credit Loss [Line Items]      
2020 217    
2019 369    
2018 438    
2017 326    
2016 288    
Prior 935    
Total Term Loans 2,573    
Revolving Loans 56    
Revolving Loans Converted to Term 0    
Total Loans 2,629 $ 561  
Internal Risk, Percentage   1.90%  
Commercial Banking | Commercial and multifamily real estate | Criticized | Criticized nonperforming      
Financing Receivable, Allowance for Credit Loss [Line Items]      
2020 0    
2019 12    
2018 30    
2017 0    
2016 3    
Prior 137    
Total Term Loans 182    
Revolving Loans 0    
Revolving Loans Converted to Term 0    
Total Loans 182 $ 38  
Internal Risk, Percentage   0.10%  
Commercial Banking | Commercial and industrial      
Financing Receivable, Allowance for Credit Loss [Line Items]      
2020 7,770    
2019 9,173    
2018 5,078    
2017 3,352    
2016 2,081    
Prior 3,656    
Total Term Loans 31,110    
Revolving Loans 13,362    
Revolving Loans Converted to Term 225    
Total Loans 44,697 $ 44,263  
Internal Risk, Percentage   100.00%  
Commercial Banking | Commercial and industrial | PCI loans      
Financing Receivable, Allowance for Credit Loss [Line Items]      
Total Loans   $ 10  
Internal Risk, Percentage   0.00%  
Commercial Banking | Commercial and industrial | Noncriticized      
Financing Receivable, Allowance for Credit Loss [Line Items]      
2020 7,467    
2019 8,363    
2018 4,565    
2017 2,932    
2016 1,981    
Prior 3,443    
Total Term Loans 28,751    
Revolving Loans 11,213    
Revolving Loans Converted to Term 183    
Total Loans 40,147 $ 42,223  
Internal Risk, Percentage   95.40%  
Commercial Banking | Commercial and industrial | Criticized | Criticized performing      
Financing Receivable, Allowance for Credit Loss [Line Items]      
2020 258    
2019 732    
2018 461    
2017 345    
2016 91    
Prior 210    
Total Term Loans 2,097    
Revolving Loans 1,825    
Revolving Loans Converted to Term 42    
Total Loans 3,964 $ 1,620  
Internal Risk, Percentage   3.70%  
Commercial Banking | Commercial and industrial | Criticized | Criticized nonperforming      
Financing Receivable, Allowance for Credit Loss [Line Items]      
2020 45    
2019 78    
2018 52    
2017 75    
2016 9    
Prior 3    
Total Term Loans 262    
Revolving Loans 324    
Revolving Loans Converted to Term 0    
Total Loans $ 586 $ 410  
Internal Risk, Percentage   0.90%