Annual report pursuant to Section 13 and 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
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
Consumer real estate | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 156,497 141,795
Consumer real estate | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 25,173 34,050
Consumer real estate | Non-core Residential Mortgage | Pay option    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,800 2,300
Consumer real estate | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 10,127 12,066
Consumer real estate | Residential Mortgage PCI | Pay option    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,600 2,000
Consumer real estate | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 49,373 54,917
Consumer real estate | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 13,459 16,412
Consumer real estate | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,611 4,619
Consumer real estate | Less than 620 | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,479 3,129
Consumer real estate | Less than 620 | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,198 4,749
Consumer real estate | Less than 620 | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,741 3,798
Consumer real estate | Less than 620 | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,254 1,322
Consumer real estate | Less than 620 | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,692 3,490
Consumer real estate | Less than 620 | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 559 729
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 5,094 5,472
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 2,807 3,762
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 2,241 2,586
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 2,853 3,295
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 3,094 3,862
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 636 825
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 22,629 22,486
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 4,512 5,138
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 2,916 3,187
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 10,069 12,180
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 3,176 3,451
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 1,069 1,356
Consumer real estate | Greater than or equal to 740 | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 105,041 85,612
Consumer real estate | Greater than or equal to 740 | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 7,181 8,420
Consumer real estate | Greater than or equal to 740 | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,229 2,495
Consumer real estate | Greater than or equal to 740 | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 35,197 38,120
Consumer real estate | Greater than or equal to 740 | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 4,497 5,609
Consumer real estate | Greater than or equal to 740 | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,347 1,709
Consumer real estate | Less than or equal to 90 percent | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 129,737 110,023
Consumer real estate | Less than or equal to 90 percent | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 14,280 16,481
Consumer real estate | Less than or equal to 90 percent | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 7,811 8,655
Consumer real estate | Less than or equal to 90 percent | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 47,171 51,262
Consumer real estate | Less than or equal to 90 percent | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 8,480 8,347
Consumer real estate | Less than or equal to 90 percent | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,942 2,003
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 3,634 4,038
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 1,446 2,224
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 1,021 1,403
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 1,006 1,858
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 1,668 2,190
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 630 852
Consumer real estate | Greater than 100 percent | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,872 2,638
Consumer real estate | Greater than 100 percent | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,972 3,364
Consumer real estate | Greater than 100 percent | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,295 2,008
Consumer real estate | Greater than 100 percent | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,196 1,797
Consumer real estate | Greater than 100 percent | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,311 5,875
Consumer real estate | Greater than 100 percent | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,039 1,764
Consumer real estate | Fully Insured Loans | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 21,254 25,096
Consumer real estate | Fully Insured Loans | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 7,475 11,981
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