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Loans and Allowance for Loan Losses - Loans in Commercial Portfolio Segment Monitored for Credit Quality Revolving and Non Revolving Loans (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Credit quality of consumer loans    
Financing receivable $ 84,974 $ 88,213
Commercial    
Credit quality of consumer loans    
2020 $ 6,949  
2020 Percentage 14.00%  
2019 $ 7,451  
2019 Percentage 15.00%  
2018 $ 6,076  
2018 Percentage 12.00%  
2017 $ 3,456  
2017 Percentage 7.00%  
2016 $ 2,610  
2016 Percentage 5.00%  
Prior $ 6,506  
Prior Percentage 13.00%  
Revolving Loans $ 16,933  
Revolving Percentage 34.00%  
Financing receivable $ 49,981 $ 45,745
Total 100.00%  
Commercial | Commercial and industrial    
Credit quality of consumer loans    
2020 $ 5,215  
2019 2,652  
2018 2,145  
2017 1,384  
2016 799  
Prior 1,849  
Revolving Loans 16,826  
Financing receivable 30,870  
Commercial | Commercial and industrial | Pass    
Credit quality of consumer loans    
2020 5,125  
2019 2,374  
2018 1,806  
2017 1,273  
2016 764  
Prior 1,669  
Revolving Loans 15,647  
Financing receivable 28,658  
Commercial | Commercial and industrial | Special Mention    
Credit quality of consumer loans    
2020 49  
2019 239  
2018 203  
2017 72  
2016 28  
Prior 114  
Revolving Loans 680  
Financing receivable 1,385  
Commercial | Commercial and industrial | Classified    
Credit quality of consumer loans    
2020 41  
2019 39  
2018 136  
2017 39  
2016 7  
Prior 66  
Revolving Loans 499  
Financing receivable 827  
Commercial | Commercial mortgage    
Credit quality of consumer loans    
2020 1,273  
2019 3,988  
2018 3,426  
2017 1,907  
2016 1,754  
Prior 4,163  
Revolving Loans 89  
Financing receivable 16,600  
Commercial | Commercial mortgage | Pass    
Credit quality of consumer loans    
2020 1,254  
2019 3,812  
2018 3,032  
2017 1,864  
2016 1,637  
Prior 3,543  
Revolving Loans 74  
Financing receivable 15,216  
Commercial | Commercial mortgage | Special Mention    
Credit quality of consumer loans    
2020 18  
2019 168  
2018 336  
2017 35  
2016 111  
Prior 196  
Revolving Loans 15  
Financing receivable 879  
Commercial | Commercial mortgage | Classified    
Credit quality of consumer loans    
2020 1  
2019 8  
2018 58  
2017 8  
2016 6  
Prior 424  
Revolving Loans 0  
Financing receivable 505  
Commercial | Construction    
Credit quality of consumer loans    
2020 162  
2019 671  
2018 504  
2017 165  
2016 8  
Prior 22  
Revolving Loans 18  
Financing receivable 1,550  
Commercial | Construction | Pass    
Credit quality of consumer loans    
2020 162  
2019 668  
2018 380  
2017 152  
2016 0  
Prior 2  
Revolving Loans 11  
Financing receivable 1,375  
Commercial | Construction | Special Mention    
Credit quality of consumer loans    
2020 0  
2019 3  
2018 80  
2017 0  
2016 8  
Prior 0  
Revolving Loans 7  
Financing receivable 98  
Commercial | Construction | Classified    
Credit quality of consumer loans    
2020 0  
2019 0  
2018 44  
2017 13  
2016 0  
Prior 20  
Revolving Loans 0  
Financing receivable 77  
Commercial | Lease financing    
Credit quality of consumer loans    
2020 299  
2019 140  
2018 1  
2017 0  
2016 49  
Prior 472  
Revolving Loans 0  
Financing receivable 961  
Commercial | Lease financing | Pass    
Credit quality of consumer loans    
2020 299  
2019 140  
2018 1  
2017 0  
2016 49  
Prior 472  
Revolving Loans 0  
Financing receivable 961  
Commercial | Lease financing | Special Mention    
Credit quality of consumer loans    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Financing receivable 0  
Commercial | Lease financing | Classified    
Credit quality of consumer loans    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 0  
Financing receivable $ 0