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
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 916,666 $ 906,683
Estimate of Fair Value Measurement    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 7,325 7,085
Commercial Portfolio Segment    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 469,316 458,526
Commercial Portfolio Segment | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 59,177 57,355
Commercial Portfolio Segment | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 21,828 22,375
Commercial Portfolio Segment | Estimate of Fair Value Measurement    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 6,290 6,034
Commercial Portfolio Segment | Pass rated | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 58,538 56,957
Commercial Portfolio Segment | Pass rated | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 21,103 21,565
Commercial Portfolio Segment | Reservable criticized | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 639 398
Commercial Portfolio Segment | Reservable criticized | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 725 810
Commercial Portfolio Segment | United States    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 277,675 270,372
Commercial Portfolio Segment | United States | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 55,600 54,300
Commercial Portfolio Segment | United States | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 13,560 12,993
Commercial Portfolio Segment | United States | Pass rated    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 268,793 261,214
Commercial Portfolio Segment | United States | Pass rated | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 376 453
Commercial Portfolio Segment | United States | Reservable criticized    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 8,882 9,158
Commercial Portfolio Segment | United States | Reservable criticized | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 57 71
Commercial Portfolio Segment | United States | Refreshed FICO or Internal Credit Metric | Business Card and Small Business Loan | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 806 $ 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 $ 221 $ 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 623 591
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 1,863 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 3,593 3,264
Commercial Portfolio Segment | United States | Other internal credit metrics | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 6,827 6,673
Commercial Portfolio Segment | Non United States    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 90,786 89,397
Commercial Portfolio Segment | Non United States | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,600 3,100
Commercial Portfolio Segment | Non United States | Pass rated    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 87,639 85,689
Commercial Portfolio Segment | Non United States | Reservable criticized    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 3,147 $ 3,708