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
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 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 $ 935,824   $ 935,824   $ 936,749
Proceeds from sales of loans originally classified as held for investment and instruments from related securitization activities     7,172 $ 5,317  
Purchased credit impaired loans sold 51 $ 204 160 204  
Recoveries of loans and leases previously charged off 382 442 767 818  
90 Days or More Past Due          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Loans and leases 6,280   6,280   7,135
Consumer Portfolio Segment          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Loans and leases 449,577   449,577   455,276
Consumer Portfolio Segment | 90 Days or More Past Due          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Loans and leases 5,405   5,405   6,564
Consumer real estate          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Recoveries of loans and leases previously charged off 130 167 $ 277 290  
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 | Residential Mortgage          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Gain (loss) on the sale of loans and leases receivable 572        
Consumer real estate | Chapter Seven Bankruptcy          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Loans and leases 1,000   $ 1,000    
Nonperforming Financing Receivable          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Transfer of nonperforming loans to held-for-sale     2 198  
Nonperforming Financing Receivable | Junior Lien Home Equity Financing Receivable          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Loans and leases 266   $ 266   $ 330
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 $ 139   $ 139    
Nonperforming loans discharged more than twelve months prior (greater than) 57.00%   57.00%    
Nonperforming loans discharged more than twenty four months prior (greater than) 50.00%   50.00%    
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 $ 102   $ 102    
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 168 323 546 465  
Purchased credit impaired loans sold 51 204 160 204  
Recoveries of loans and leases previously charged off 7 3 27 14  
Gain (loss) on the sale of loans and leases receivable 10 $ 6 26 $ 12  
Nonperforming Financing Receivable | Consumer real estate | Chapter Seven Bankruptcy          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Loans and leases $ 263   $ 263