Annual report pursuant to Section 13 and 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
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 906,683 $ 896,983
Loans and leases, measured at fair value 7,085 6,938
Commercial Portfolio Segment    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 458,526 440,814
Commercial Portfolio Segment | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 57,355 57,199
Commercial Portfolio Segment | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 22,375 21,352
Commercial Portfolio Segment | Pass rated | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 56,957 56,688
Commercial Portfolio Segment | Pass rated | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 21,565 20,644
Commercial Portfolio Segment | Reservable criticized | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 398 511
Commercial Portfolio Segment | Reservable criticized | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 810 708
Commercial Portfolio Segment | United States    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 270,372 252,771
Loans and leases, measured at fair value 2,900 2,300
Commercial Portfolio Segment | United States | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 54,300 53,600
Commercial Portfolio Segment | United States | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 12,993 12,876
Commercial Portfolio Segment | United States | Pass rated    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 261,214 243,922
Commercial Portfolio Segment | United States | Pass rated | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 453 571
Commercial Portfolio Segment | United States | Reservable criticized    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 9,158 8,849
Commercial Portfolio Segment | United States | Reservable criticized | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 71 $ 96
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 98.00% 98.00%
Commercial Portfolio Segment | United States | Business Card and Small Business Loan | Refreshed FICO or Internal Credit Metric | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 755 $ 670
Commercial Portfolio Segment | United States | Less than 620 | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 200 184
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 591 543
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 1,741 1,627
Commercial Portfolio Segment | United States | Greater than or equal to 740 | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,264 3,027
Commercial Portfolio Segment | United States | Other internal credit metrics | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 6,673 6,828
Commercial Portfolio Segment | Non United States    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 89,397 91,549
Loans and leases, measured at fair value 3,100 2,800
Commercial Portfolio Segment | Non United States | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,100 3,500
Commercial Portfolio Segment | Non United States | Pass rated    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 85,689 87,905
Commercial Portfolio Segment | Non United States | Reservable criticized    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,708 3,644
Estimate of Fair Value Measurement    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 7,085 6,938
Estimate of Fair Value Measurement | Commercial Portfolio Segment    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 6,034 $ 5,067