Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Consumer Real Estate - Credit Quality Indicators (Details)

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Outstanding Loans and Leases - Consumer Real Estate - Credit Quality Indicators (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 927,117 $ 906,683
Estimate of Fair Value Measurement    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 6,285 7,085
Consumer real estate | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 170,657 156,497
Consumer real estate | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 20,390 25,173
Consumer real estate | Non-core Residential Mortgage | Pay option    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,500 1,800
Consumer real estate | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 8,399 10,127
Consumer real estate | Residential Mortgage PCI | Pay option    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,300 1,600
Consumer real estate | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 45,377 49,373
Consumer real estate | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 11,462 13,459
Consumer real estate | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,913 3,611
Consumer real estate | Less than 620 | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,285 2,479
Consumer real estate | Less than 620 | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,560 3,198
Consumer real estate | Less than 620 | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,102 2,741
Consumer real estate | Less than 620 | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,192 1,254
Consumer real estate | Less than 620 | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,268 2,692
Consumer real estate | Less than 620 | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 470 559
Consumer real estate | Greater than or equal to 620 and less than 680 | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 4,652 5,094
Consumer real estate | Greater than or equal to 620 and less than 680 | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,260 2,807
Consumer real estate | Greater than or equal to 620 and less than 680 | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,740 2,241
Consumer real estate | Greater than or equal to 620 and less than 680 | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,416 2,853
Consumer real estate | Greater than or equal to 620 and less than 680 | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,506 3,094
Consumer real estate | Greater than or equal to 620 and less than 680 | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 495 636
Consumer real estate | Greater than or equal to 680 and less than 740 | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 22,153 22,629
Consumer real estate | Greater than or equal to 680 and less than 740 | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,720 4,512
Consumer real estate | Greater than or equal to 680 and less than 740 | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,446 2,916
Consumer real estate | Greater than or equal to 680 and less than 740 | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 8,484 10,069
Consumer real estate | Greater than or equal to 680 and less than 740 | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,860 3,176
Consumer real estate | Greater than or equal to 680 and less than 740 | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 862 1,069
Consumer real estate | Greater than or equal to 740 | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 122,321 105,041
Consumer real estate | Greater than or equal to 740 | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 6,310 7,181
Consumer real estate | Greater than or equal to 740 | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,111 2,229
Consumer real estate | Greater than or equal to 740 | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 33,285 35,197
Consumer real estate | Greater than or equal to 740 | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,828 4,497
Consumer real estate | Greater than or equal to 740 | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,086 1,347
Consumer real estate | Less than or equal to 90 percent | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 146,679 129,737
Consumer real estate | Less than or equal to 90 percent | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 12,603 14,280
Consumer real estate | Less than or equal to 90 percent | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 7,095 7,811
Consumer real estate | Less than or equal to 90 percent | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 43,942 47,171
Consumer real estate | Less than or equal to 90 percent | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 8,128 8,480
Consumer real estate | Less than or equal to 90 percent | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,881 1,942
Consumer real estate | Greater than 90 percent but less than or equal to 100 percent | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,288 3,634
Consumer real estate | Greater than 90 percent but less than or equal to 100 percent | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,016 1,446
Consumer real estate | Greater than 90 percent but less than or equal to 100 percent | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 624 1,021
Consumer real estate | Greater than 90 percent but less than or equal to 100 percent | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 660 1,006
Consumer real estate | Greater than 90 percent but less than or equal to 100 percent | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,211 1,668
Consumer real estate | Greater than 90 percent but less than or equal to 100 percent | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 420 630
Consumer real estate | Greater than 100 percent | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,444 1,872
Consumer real estate | Greater than 100 percent | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,231 1,972
Consumer real estate | Greater than 100 percent | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 680 1,295
Consumer real estate | Greater than 100 percent | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 775 1,196
Consumer real estate | Greater than 100 percent | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,123 3,311
Consumer real estate | Greater than 100 percent | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 612 1,039
Consumer real estate | Fully Insured Loans | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 19,246 21,254
Consumer real estate | Fully Insured Loans | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 5,540 7,475
Consumer real estate | Fully Insured Loans | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 0 0
Consumer real estate | Fully Insured Loans | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 0 0
Consumer real estate | Fully Insured Loans | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 0 0
Consumer real estate | Fully Insured Loans | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 0 $ 0