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 ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
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 $ 934,078,000,000   $ 936,749,000,000
Proceeds from sales of loans originally classified as held for investment and instruments from related securitization activities 2,684,000,000 $ 2,590,000,000  
Purchased credit impaired loans sold 109,000,000 0  
Recoveries of loans and leases previously charged off 385,000,000 376,000,000  
90 Days or More Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans and leases 6,642,000,000   7,135,000,000
Consumer Portfolio Segment      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans and leases 447,401,000,000   455,276,000,000
Consumer Portfolio Segment | 90 Days or More Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans and leases 6,075,000,000   6,564,000,000
Consumer real estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Recoveries of loans and leases previously charged off $ 147,000,000 123,000,000  
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 | Non-core Portfolio, Home Equity Financing Receivable      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans and leases $ 10,195,000,000   10,783,000,000
Consumer real estate | Residential Mortgage      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Transfer of nonperforming loans to held-for-sale 1,200,000,000    
Consumer real estate | 90 Days or More Past Due | Non-core Portfolio, Home Equity Financing Receivable      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans and leases 549,000,000   572,000,000
Consumer real estate | Chapter Seven Bankruptcy      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans and leases 1,100,000,000    
Nonperforming Financing Receivable      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Transfer of nonperforming loans to held-for-sale 2,000,000 221,000,000  
Nonperforming Financing Receivable | Junior Lien Home Equity Financing Receivable      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans and leases $ 294,000,000   $ 330,000,000
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 $ 165,000,000    
Nonperforming loans discharged more than twelve months prior (greater than) 62.00%    
Nonperforming loans discharged more than twenty four months prior (greater than) 53.00%    
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, 90 days or more past due $ 113,000,000    
Nonperforming Financing Receivable | Consumer Portfolio Segment      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Proceeds from sales of loans originally classified as held for investment and instruments from related securitization activities 378,000,000 142,000,000  
Purchased credit impaired loans sold 109,000,000 0  
Recoveries of loans and leases previously charged off 20,000,000 11,000,000  
Gain (loss) on the sale of loans and leases receivable 16,000,000 $ 6,000,000  
Nonperforming Financing Receivable | Consumer real estate | Chapter Seven Bankruptcy      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans and leases $ 299,000,000