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, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 936,749 $ 906,683
Estimate of Fair Value Measurement    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 5,710 7,085
Commercial Portfolio Segment    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 481,473 458,526
Commercial Portfolio Segment | Estimate of Fair Value Measurement    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 4,782 6,034
Commercial Portfolio Segment | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 58,298 57,355
Commercial Portfolio Segment | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 22,116 22,375
Commercial Portfolio Segment | Pass rated | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 57,732 56,957
Commercial Portfolio Segment | Pass rated | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 21,535 21,565
Commercial Portfolio Segment | Reservable criticized | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 566 398
Commercial Portfolio Segment | Reservable criticized | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 581 810
Commercial Portfolio Segment | United States    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 284,836 270,372
Commercial Portfolio Segment | United States | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 54,800 54,300
Commercial Portfolio Segment | United States | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 13,649 12,993
Commercial Portfolio Segment | United States | Pass rated    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 275,904 261,214
Commercial Portfolio Segment | United States | Pass rated | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 322 453
Commercial Portfolio Segment | United States | Reservable criticized    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 8,932 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 $ 709 $ 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 98.00% 98.00%
Commercial Portfolio Segment | United States | Less than 620 | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 223 $ 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 625 591
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 1,875 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 3,713 3,264
Commercial Portfolio Segment | United States | Other internal credit metrics | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 6,841 6,673
Commercial Portfolio Segment | Non United States    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 97,792 89,397
Commercial Portfolio Segment | Non United States | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,500 3,100
Commercial Portfolio Segment | Non United States | Pass rated    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 96,199 85,689
Commercial Portfolio Segment | Non United States | Reservable criticized    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 1,593 $ 3,708