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 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 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 $ 929,801   $ 929,801   $ 936,749
Proceeds from sales of loans originally classified as held for investment and instruments from related securitization activities     13,600 $ 8,874  
Purchased credit impaired loans sold 2,000 $ 538 2,100 742  
90 Days or More Past Due          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Loans and leases 5,528   5,528   7,135
Consumer Portfolio Segment          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Loans and leases 446,546   446,546   455,276
Proceeds from sales of loans originally classified as held for investment and instruments from related securitization activities 3,700   4,900    
Gain (loss) on the sale of loans and leases receivable 84   656    
Consumer Portfolio Segment | 90 Days or More Past Due          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Loans and leases 4,919   $ 4,919   6,564
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 951   $ 951    
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 225   $ 225   $ 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 $ 113   $ 113    
Nonperforming loans discharged more than twelve months prior (greater than) 66.00%   66.00%    
Nonperforming loans discharged more than twenty four months prior (greater than) 58.00%   58.00%    
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 $ 90   $ 90    
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 2,100 700 2,700 1,200  
Purchased credit impaired loans sold 2,000 $ 538 2,100 $ 742  
Nonperforming Financing Receivable | Consumer real estate | Chapter Seven Bankruptcy          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Loans and leases $ 220   $ 220