Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Commercial - TDRs Entered Into During the Period (Details)

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Outstanding Loans and Leases - Commercial - TDRs Entered Into During the Period (Details) - USD ($)
 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, Modifications [Line Items]          
Threshold period past due for nonperforming status of financing receivables     90 days   90 days
Commercial Portfolio Segment          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance $ 804,000,000 $ 456,000,000 $ 1,352,000,000 $ 755,000,000  
Carrying Value 794,000,000 437,000,000 1,264,000,000 704,000,000  
Net charge-offs 9,000,000 21,000,000 $ 26,000,000 62,000,000  
Threshold period past due for nonperforming status of financing receivables     90 days    
Commercial Portfolio Segment | Commercial lease financing          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 45,000,000   $ 45,000,000    
Carrying Value 45,000,000   45,000,000    
Trouble debt restructurings entered payment default that were modified during the preceding twelve months     2,000,000 0  
Commercial Portfolio Segment | Commercial Real Estate          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 5,000,000 44,000,000 5,000,000 59,000,000  
Carrying Value 5,000,000 37,000,000 5,000,000 46,000,000  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months     17,000,000 32,000,000  
Commercial Portfolio Segment | Small Business Commercial          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 3,000,000 7,000,000 5,000,000 9,000,000  
Carrying Value 3,000,000 7,000,000 5,000,000 10,000,000  
Commercial Portfolio Segment | United States          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 743,000,000 405,000,000 1,040,000,000 687,000,000  
Carrying Value 733,000,000 $ 393,000,000 962,000,000 648,000,000  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months     178,000,000 $ 78,000,000  
Commercial Portfolio Segment | Non United States          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 8,000,000   257,000,000    
Carrying Value $ 8,000,000   $ 247,000,000