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Loans - Commercial Banking: Risk Profile by Internal Risk Rating (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]      
Total Loans $ 251,624 $ 265,809 $ 245,899
Commercial Banking      
Financing Receivable, Allowance for Credit Loss [Line Items]      
2020 14,262    
2019 14,181    
2018 8,366    
2017 4,818    
2016 3,990    
Prior 9,561    
Total Term Loans 55,178    
Revolving Loans 20,455    
Revolving Loans Converted to Term 147    
Total Loans 75,780 $ 74,508  
Internal Risk, Percentage   100.00%  
Loans under Paycheck Protection Program 238    
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 4,111    
2019 5,389    
2018 3,777    
2017 1,798    
2016 2,043    
Prior 6,312    
Total Term Loans 23,430    
Revolving Loans 7,226    
Revolving Loans Converted to Term 25    
Total Loans 30,681 $ 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 3,791    
2019 4,932    
2018 3,232    
2017 1,437    
2016 1,649    
Prior 4,904    
Total Term Loans 19,945    
Revolving Loans 7,114    
Revolving Loans Converted to Term 0    
Total Loans 27,059 $ 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 320    
2019 446    
2018 515    
2017 355    
2016 391    
Prior 1,258    
Total Term Loans 3,285    
Revolving Loans 112    
Revolving Loans Converted to Term 25    
Total Loans 3,422 $ 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 11    
2018 30    
2017 6    
2016 3    
Prior 150    
Total Term Loans 200    
Revolving Loans 0    
Revolving Loans Converted to Term 0    
Total Loans 200 $ 38  
Internal Risk, Percentage   0.10%  
Commercial Banking | Commercial and industrial      
Financing Receivable, Allowance for Credit Loss [Line Items]      
2020 10,151    
2019 8,792    
2018 4,589    
2017 3,020    
2016 1,947    
Prior 3,249    
Total Term Loans 31,748    
Revolving Loans 13,229    
Revolving Loans Converted to Term 122    
Total Loans 45,099 $ 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 9,761    
2019 7,890    
2018 4,043    
2017 2,717    
2016 1,832    
Prior 3,034    
Total Term Loans 29,277    
Revolving Loans 11,548    
Revolving Loans Converted to Term 80    
Total Loans 40,905 $ 42,223  
Internal Risk, Percentage   95.40%  
Commercial Banking | Commercial and industrial | Criticized | Criticized performing      
Financing Receivable, Allowance for Credit Loss [Line Items]      
2020 316    
2019 794    
2018 521    
2017 252    
2016 106    
Prior 215    
Total Term Loans 2,204    
Revolving Loans 1,498    
Revolving Loans Converted to Term 42    
Total Loans 3,744 $ 1,620  
Internal Risk, Percentage   3.70%  
Commercial Banking | Commercial and industrial | Criticized | Criticized nonperforming      
Financing Receivable, Allowance for Credit Loss [Line Items]      
2020 74    
2019 108    
2018 25    
2017 51    
2016 9    
Prior 0    
Total Term Loans 267    
Revolving Loans 183    
Revolving Loans Converted to Term 0    
Total Loans $ 450 $ 410  
Internal Risk, Percentage   0.90%