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Loans - Commercial Banking: Risk Profile by Internal Risk Rating (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 262,990 $ 265,809 $ 240,273
Commercial Banking      
Loans and Leases Receivable Disclosure [Line Items]      
2020 4,602    
2019 17,307    
2018 9,534    
2017 6,019    
2016 4,710    
Prior 11,733    
Total Term Loans 53,905    
Revolving Loans 27,170    
Revolving Loans Converted to Term 85    
Loans held for investment 81,160 $ 74,508  
Internal Risk, Percentage   100.00%  
Commercial Banking | PCI loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment   $ 31  
Internal Risk, Percentage   0.00%  
Commercial Banking | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment   $ 71,848  
Internal Risk, Percentage   96.50%  
Commercial Banking | Criticized | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment   $ 2,181  
Internal Risk, Percentage   2.90%  
Commercial Banking | Criticized | Criticized nonperforming      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment   $ 448  
Internal Risk, Percentage   0.60%  
Commercial Banking | Commercial and multifamily real estate      
Loans and Leases Receivable Disclosure [Line Items]      
2020 1,846    
2019 5,803    
2018 4,106    
2017 2,364    
2016 2,506    
Prior 7,464    
Total Term Loans 24,089    
Revolving Loans 8,284    
Revolving Loans Converted to Term 0    
Loans held for investment 32,373 $ 30,245  
Internal Risk, Percentage   100.00%  
Commercial Banking | Commercial and multifamily real estate | PCI loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment   $ 21  
Internal Risk, Percentage   0.10%  
Commercial Banking | Commercial and multifamily real estate | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
2020 1,846    
2019 5,748    
2018 4,096    
2017 2,264    
2016 2,344    
Prior 7,181    
Total Term Loans 23,479    
Revolving Loans 8,284    
Revolving Loans Converted to Term 0    
Loans held for investment 31,763 $ 29,625  
Internal Risk, Percentage   97.90%  
Commercial Banking | Commercial and multifamily real estate | Criticized | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
2020 0    
2019 55    
2018 9    
2017 91    
2016 161    
Prior 223    
Total Term Loans 539    
Revolving Loans 0    
Revolving Loans Converted to Term 0    
Loans held for investment 539 $ 561  
Internal Risk, Percentage   1.90%  
Commercial Banking | Commercial and multifamily real estate | Criticized | Criticized nonperforming      
Loans and Leases Receivable Disclosure [Line Items]      
2020 0    
2019 0    
2018 1    
2017 9    
2016 1    
Prior 60    
Total Term Loans 71    
Revolving Loans 0    
Revolving Loans Converted to Term 0    
Loans held for investment 71 $ 38  
Internal Risk, Percentage   0.10%  
Commercial Banking | Commercial and industrial      
Loans and Leases Receivable Disclosure [Line Items]      
2020 2,756    
2019 11,504    
2018 5,428    
2017 3,655    
2016 2,204    
Prior 4,269    
Total Term Loans 29,816    
Revolving Loans 18,886    
Revolving Loans Converted to Term 85    
Loans held for investment 48,787 $ 44,263  
Internal Risk, Percentage   100.00%  
Commercial Banking | Commercial and industrial | PCI loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment   $ 10  
Internal Risk, Percentage   0.00%  
Commercial Banking | Commercial and industrial | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
2020 2,712    
2019 11,031    
2018 5,085    
2017 3,290    
2016 2,098    
Prior 4,149    
Total Term Loans 28,365    
Revolving Loans 17,504    
Revolving Loans Converted to Term 82    
Loans held for investment 45,951 $ 42,223  
Internal Risk, Percentage   95.40%  
Commercial Banking | Commercial and industrial | Criticized | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
2020 32    
2019 380    
2018 324    
2017 287    
2016 95    
Prior 120    
Total Term Loans 1,238    
Revolving Loans 1,172    
Revolving Loans Converted to Term 3    
Loans held for investment 2,413 $ 1,620  
Internal Risk, Percentage   3.70%  
Commercial Banking | Commercial and industrial | Criticized | Criticized nonperforming      
Loans and Leases Receivable Disclosure [Line Items]      
2020 12    
2019 93    
2018 19    
2017 78    
2016 11    
Prior 0    
Total Term Loans 213    
Revolving Loans 210    
Revolving Loans Converted to Term 0    
Loans held for investment $ 423 $ 410  
Internal Risk, Percentage   0.90%