Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Commercial - Credit Quality Indicators (Details)

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Outstanding Loans and Leases - Commercial - Credit Quality Indicators (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 927,117 $ 906,683
Estimate of Fair Value Measurement    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 6,285 7,085
Commercial Portfolio Segment    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 478,524 458,526
Commercial Portfolio Segment | Estimate of Fair Value Measurement    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 5,307 6,034
Commercial Portfolio Segment | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 59,628 57,355
Commercial Portfolio Segment | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 21,413 22,375
Commercial Portfolio Segment | Pass rated | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 59,001 56,957
Commercial Portfolio Segment | Pass rated | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 20,763 21,565
Commercial Portfolio Segment | Reservable criticized | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 627 398
Commercial Portfolio Segment | Reservable criticized | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 650 810
Commercial Portfolio Segment | United States    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 282,677 270,372
Commercial Portfolio Segment | United States | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 55,500 54,300
Commercial Portfolio Segment | United States | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 13,603 12,993
Commercial Portfolio Segment | United States | Pass rated    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 273,670 261,214
Commercial Portfolio Segment | United States | Pass rated | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 354 453
Commercial Portfolio Segment | United States | Reservable criticized    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 9,007 9,158
Commercial Portfolio Segment | United States | Reservable criticized | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 50 71
Commercial Portfolio Segment | United States | Refreshed FICO or Internal Credit Metric | Small Business Commercial | Business Card and Small Business Loan    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 825 $ 755
Commercial Portfolio Segment | United States | Internal Credit Metrics | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Percentage outstanding, current or less than 30 days past due 99.00% 98.00%
Commercial Portfolio Segment | United States | Less than 620 | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 224 $ 200
Commercial Portfolio Segment | United States | Greater than or equal to 620 and less than 680 | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 615 591
Commercial Portfolio Segment | United States | Greater than or equal to 680 and less than 740 | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,842 1,741
Commercial Portfolio Segment | United States | Greater than or equal to 740 | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,683 3,264
Commercial Portfolio Segment | United States | Other internal credit metrics | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 6,835 6,673
Commercial Portfolio Segment | Non United States    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 95,896 89,397
Commercial Portfolio Segment | Non United States | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 4,200 3,100
Commercial Portfolio Segment | Non United States | Pass rated    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 93,498 85,689
Commercial Portfolio Segment | Non United States | Reservable criticized    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 2,398 $ 3,708