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
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 903,153 $ 896,983
Loans and leases, measured at fair value 8,660 6,938
Consumer Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases, measured at fair value 1,800 1,900
Consumer Real Estate | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 146,100 141,795
Consumer Real Estate | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 28,736 34,050
Consumer Real Estate | Non-core Residential Mortgage | Pay option    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,100 2,300
Consumer Real Estate | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 11,107 12,066
Consumer Real Estate | Residential Mortgage PCI | Pay option    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,800 2,000
Consumer Real Estate | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 52,477 54,917
Consumer Real Estate | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 14,989 16,412
Consumer Real Estate | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 4,121 4,619
Consumer Real Estate | Less than 620 | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,789 3,129
Consumer Real Estate | Less than 620 | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,716 4,749
Consumer Real Estate | Less than 620 | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,177 3,798
Consumer Real Estate | Less than 620 | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,276 1,322
Consumer Real Estate | Less than 620 | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,040 3,490
Consumer Real Estate | Less than 620 | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 617 729
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 5,278 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 3,164 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 2,437 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 3,044 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 3,501 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 735 825
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 22,372 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 4,932 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 3,103 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 11,042 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 3,332 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 1,210 1,356
Consumer Real Estate | Greater than or equal to 740 | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 93,302 85,612
Consumer Real Estate | Greater than or equal to 740 | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 7,804 8,420
Consumer Real Estate | Greater than or equal to 740 | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,390 2,495
Consumer Real Estate | Greater than or equal to 740 | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 37,115 38,120
Consumer Real Estate | Greater than or equal to 740 | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 5,116 5,609
Consumer Real Estate | Greater than or equal to 740 | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,559 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 117,311 110,023
Consumer Real Estate | Less than or equal to 90 percent | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 14,990 16,481
Consumer Real Estate | Less than or equal to 90 percent | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 8,087 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 49,186 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 8,178 8,347
Consumer Real Estate | Less than or equal to 90 percent | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,821 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 4,036 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 1,859 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 1,215 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 1,629 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 1,925 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 741 852
Consumer Real Estate | Greater than 100 percent | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,394 2,638
Consumer Real Estate | Greater than 100 percent | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,767 3,364
Consumer Real Estate | Greater than 100 percent | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,805 2,008
Consumer Real Estate | Greater than 100 percent | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,662 1,797
Consumer Real Estate | Greater than 100 percent | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 4,886 5,875
Consumer Real Estate | Greater than 100 percent | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,559 1,764
Consumer Real Estate | Fully Insured Loans | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 22,359 25,096
Consumer Real Estate | Fully Insured Loans | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 9,120 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