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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
Jun. 30, 2020
Dec. 31, 2019
Credit quality of consumer loans    
Financing receivable $ 86,535 $ 88,213
Commercial    
Credit quality of consumer loans    
2020 $ 5,395  
2020 Percentage 11.00%  
2019 $ 7,610  
2019 Percentage 16.00%  
2018 $ 6,108  
2018 Percentage 12.00%  
2017 $ 3,560  
2017 Percentage 7.00%  
2016 $ 2,735  
2016 Percentage 6.00%  
Prior $ 7,031  
Prior Percentage 14.00%  
Revolving Loans $ 16,447  
Revolving Percentage 34.00%  
Financing receivable $ 48,886 $ 45,745
Total 100.00%  
Commercial | Commercial and industrial    
Credit quality of consumer loans    
2020 $ 4,198  
2019 2,705  
2018 2,159  
2017 1,386  
2016 830  
Prior 1,849  
Revolving Loans 16,337  
Financing receivable 29,464  
Commercial | Commercial and industrial | Pass    
Credit quality of consumer loans    
2020 4,124  
2019 2,389  
2018 1,886  
2017 1,275  
2016 821  
Prior 1,608  
Revolving Loans 15,074  
Financing receivable 27,177  
Commercial | Commercial and industrial | Special Mention    
Credit quality of consumer loans    
2020 24  
2019 280  
2018 198  
2017 71  
2016 8  
Prior 171  
Revolving Loans 656  
Financing receivable 1,408  
Commercial | Commercial and industrial | Classified    
Credit quality of consumer loans    
2020 50  
2019 36  
2018 75  
2017 40  
2016 1  
Prior 70  
Revolving Loans 607  
Financing receivable 879  
Commercial | Commercial mortgage    
Credit quality of consumer loans    
2020 921  
2019 3,897  
2018 3,460  
2017 1,903  
2016 1,812  
Prior 4,602  
Revolving Loans 88  
Financing receivable 16,683  
Commercial | Commercial mortgage | Pass    
Credit quality of consumer loans    
2020 911  
2019 3,766  
2018 3,101  
2017 1,868  
2016 1,696  
Prior 4,036  
Revolving Loans 73  
Financing receivable 15,451  
Commercial | Commercial mortgage | Special Mention    
Credit quality of consumer loans    
2020 10  
2019 124  
2018 349  
2017 31  
2016 111  
Prior 163  
Revolving Loans 15  
Financing receivable 803  
Commercial | Commercial mortgage | Classified    
Credit quality of consumer loans    
2020 0  
2019 7  
2018 10  
2017 4  
2016 5  
Prior 403  
Revolving Loans 0  
Financing receivable 429  
Commercial | Construction    
Credit quality of consumer loans    
2020 124  
2019 739  
2018 488  
2017 271  
2016 43  
Prior 25  
Revolving Loans 22  
Financing receivable 1,712  
Commercial | Construction | Pass    
Credit quality of consumer loans    
2020 124  
2019 730  
2018 345  
2017 255  
2016 35  
Prior 0  
Revolving Loans 14  
Financing receivable 1,503  
Commercial | Construction | Special Mention    
Credit quality of consumer loans    
2020 0  
2019 5  
2018 98  
2017 3  
2016 8  
Prior 25  
Revolving Loans 8  
Financing receivable 147  
Commercial | Construction | Classified    
Credit quality of consumer loans    
2020 0  
2019 4  
2018 45  
2017 13  
2016 0  
Prior 0  
Revolving Loans 0  
Financing receivable 62  
Commercial | Lease financing    
Credit quality of consumer loans    
2020 152  
2019 269  
2018 1  
2017 0  
2016 50  
Prior 555  
Revolving Loans 0  
Financing receivable 1,027  
Commercial | Lease financing | Pass    
Credit quality of consumer loans    
2020 152  
2019 257  
2018 1  
2017 0  
2016 50  
Prior 464  
Revolving Loans 0  
Financing receivable 924  
Commercial | Lease financing | Special Mention    
Credit quality of consumer loans    
2020 0  
2019 12  
2018 0  
2017 0  
2016 0  
Prior 91  
Revolving Loans 0  
Financing receivable 103  
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