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, 2019
Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases $ 983,426 $ 946,895
Estimate of Fair Value Measurement    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 8,335 4,349
Commercial Portfolio Segment    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 517,657 499,664
Commercial Portfolio Segment | Estimate of Fair Value Measurement    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 7,741 3,667
Commercial Portfolio Segment | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 62,689 60,845
Commercial Portfolio Segment | Commercial Lease Financing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 19,880 22,534
Commercial Portfolio Segment | Small Business Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 15,333 14,565
Commercial Portfolio Segment | Pass rated | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 61,598 59,910
Commercial Portfolio Segment | Pass rated | Commercial Lease Financing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 19,551 22,168
Commercial Portfolio Segment | Pass rated | Small Business Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 231 389
Commercial Portfolio Segment | Reservable criticized | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,091 935
Commercial Portfolio Segment | Reservable criticized | Commercial Lease Financing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 329 366
Commercial Portfolio Segment | Reservable criticized | Small Business Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 18 29
Commercial Portfolio Segment | United States    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 307,048 299,277
Commercial Portfolio Segment | United States | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 59,000 56,600
Commercial Portfolio Segment | United States | Pass rated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 299,380 291,918
Commercial Portfolio Segment | United States | Reservable criticized    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases $ 7,668 $ 7,359
Commercial Portfolio Segment | United States | Internal Credit Metrics | Small Business Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Percentage outstanding, current or less than 30 days past due 99.00% 99.00%
Commercial Portfolio Segment | Non United States    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases $ 104,966 $ 98,776
Commercial Portfolio Segment | Non United States | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 3,700 4,200
Commercial Portfolio Segment | Non United States | Pass rated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 104,051 97,916
Commercial Portfolio Segment | Non United States | Reservable criticized    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 915 860
Less than 620 | Commercial Portfolio Segment | Small Business Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 308 264
Greater than or equal to 620 and less than 680 | Commercial Portfolio Segment | Small Business Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 756 684
Greater than or equal to 680 and less than 740 | Commercial Portfolio Segment | Small Business Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 2,267 2,072
Greater than or equal to 740 | Commercial Portfolio Segment | Small Business Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 4,607 4,254
Other internal credit metrics | Commercial Portfolio Segment | Small Business Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 7,146 6,873
Business Card and Small Business Loan | Commercial Portfolio Segment | United States | Refreshed FICO or Internal Credit Metric | Small Business Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases $ 715 $ 731