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
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 945,615 $ 946,895
Estimate of Fair Value Measurement    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 6,187 4,349
Commercial Portfolio Segment    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 503,974 499,664
Commercial Portfolio Segment | Estimate of Fair Value Measurement    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 5,519 3,667
Commercial Portfolio Segment | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 61,215 60,845
Commercial Portfolio Segment | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 21,196 22,534
Commercial Portfolio Segment | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 14,616 14,565
Commercial Portfolio Segment | Pass rated | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 60,257 59,910
Commercial Portfolio Segment | Pass rated | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 20,797 22,168
Commercial Portfolio Segment | Pass rated | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 249 389
Commercial Portfolio Segment | Reservable criticized | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 958 935
Commercial Portfolio Segment | Reservable criticized | Commercial Lease Financing    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 399 366
Commercial Portfolio Segment | Reservable criticized | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 27 29
Commercial Portfolio Segment | Less than 620 | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 277 264
Commercial Portfolio Segment | Greater than or equal to 620 and less than 680 | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 695 684
Commercial Portfolio Segment | Greater than or equal to 680 and less than 740 | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,081 2,072
Commercial Portfolio Segment | Greater than or equal to 740 | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 4,382 4,254
Commercial Portfolio Segment | Other internal credit metrics | Small Business Commercial    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 6,905 6,873
Commercial Portfolio Segment | United States    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 300,399 299,277
Commercial Portfolio Segment | United States | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 56,800 56,600
Commercial Portfolio Segment | United States | Pass rated    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 292,401 291,918
Commercial Portfolio Segment | United States | Reservable criticized    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 7,998 7,359
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 $ 726 $ 731
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% 99.00%
Commercial Portfolio Segment | Non United States    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 101,029 $ 98,776
Commercial Portfolio Segment | Non United States | Commercial Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 4,400 4,200
Commercial Portfolio Segment | Non United States | Pass rated    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 100,015 97,916
Commercial Portfolio Segment | Non United States | Reservable criticized    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 1,014 $ 860