Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Nonperforming, Credit Quality (Details)

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Outstanding Loans and Leases - Nonperforming, Credit Quality (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases $ 5,154 $ 6,470
Accruing past due 90 days or more $ 3,289 $ 4,415
Threshold period past due for nonperforming status of financing receivables 90 days 90 days
Residential Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Accruing past due 90 days or more $ 579 $ 1,000
Residential Mortgage | Federal Housing Administration    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases 1,600 2,200
Consumer Portfolio Segment    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases 4,306 5,166
Accruing past due 90 days or more 3,068 4,170
Consumer real estate | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases 1,011 1,087
Accruing past due 90 days or more 308 417
Consumer real estate | Core Portfolio, Home Equity Financing Receivable    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases 1,056 1,079
Accruing past due 90 days or more 0 0
Consumer real estate | Non-core Portfolio, Residential Mortgage Financing Receivable    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases 1,023 1,389
Accruing past due 90 days or more 1,853 2,813
Consumer real estate | Non-core Portfolio, Home Equity Financing Receivable    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases 1,170 1,565
Accruing past due 90 days or more 0 0
Credit card and other consumer | Credit Card Receivable | United States    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Accruing past due 90 days or more 872 900
Credit card and other consumer | Direct/Indirect Consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases 46 46
Accruing past due 90 days or more 35 40
Credit card and other consumer | Other consumer    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases 0 0
Accruing past due 90 days or more 0 0
Commercial Portfolio Segment    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases 848 1,304
Accruing past due 90 days or more $ 221 245
Threshold period past due for nonperforming status of financing receivables 90 days  
Commercial Portfolio Segment | United States    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases $ 699 814
Accruing past due 90 days or more 114 144
Commercial Portfolio Segment | Non United States    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases 31 299
Accruing past due 90 days or more 0 3
Commercial Portfolio Segment | Commercial Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases 46 112
Accruing past due 90 days or more 1 4
Commercial Portfolio Segment | Commercial Lease Financing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases 14 24
Accruing past due 90 days or more 33 19
Commercial Portfolio Segment | Small Business Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonperforming loans and leases 58 55
Accruing past due 90 days or more $ 73 $ 75