Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Nonperforming, Narrative (Details)

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Outstanding Loans and Leases - Nonperforming, Narrative (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for nonperforming status of financing receivables 90 days 90 days
Loans and leases $ 963,800 $ 946,895
90 Days or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and leases 4,395 5,474
Consumer Portfolio Segment    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and leases 449,734 447,231
Consumer Portfolio Segment | 90 Days or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and leases $ 3,840 4,754
Consumer real estate | Junior Lien Home Equity Financing Receivable    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for nonperforming status of financing receivables 90 days  
Consumer real estate | Chapter Seven Bankruptcy    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and leases $ 758  
Nonperforming Financing Receivable | Junior Lien Home Equity Financing Receivable    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and leases $ 139 $ 221
Nonperforming Financing Receivable | Chapter Seven Bankruptcy    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Threshold period past due for nonperforming status of financing receivables 90 days  
Non-performing troubled debt with no change in repayment terms at time of discharge, current with contractual payments $ 84  
Nonperforming loans discharged more than twelve months prior (greater than) 57.00%  
Nonperforming loans discharged more than twenty four months prior (greater than) 47.00%  
Nonperforming Financing Receivable | Chapter Seven Bankruptcy | 90 Days or More Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-performing troubled debt with no change in repayment terms at time of discharge, past due $ 55  
Nonperforming Financing Receivable | Consumer real estate | Chapter Seven Bankruptcy    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and leases $ 153