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
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 934,078 $ 936,749
Estimate of Fair Value Measurement    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 5,989 5,710
Consumer real estate | Estimate of Fair Value Measurement    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 894 928
Consumer real estate | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 179,578 176,618
Consumer real estate | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 16,944 19,192
Consumer real estate | Non-core Residential Mortgage | Pay option    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,300 1,400
Consumer real estate | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 7,590 8,001
Consumer real estate | Residential Mortgage PCI | Pay option    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,100 1,200
Consumer real estate | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 42,568 44,245
Consumer real estate | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 10,195 10,783
Consumer real estate | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,545 2,716
Consumer real estate | Less than 620 | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,183 2,234
Consumer real estate | Less than 620 | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,060 2,390
Consumer real estate | Less than 620 | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,790 1,941
Consumer real estate | Less than 620 | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,165 1,169
Consumer real estate | Less than 620 | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,976 2,098
Consumer real estate | Less than 620 | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 425 452
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 4,417 4,531
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 1,771 2,086
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 1,530 1,657
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 2,261 2,371
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 2,243 2,393
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 425 466
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 22,407 22,934
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 2,988 3,519
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 2,273 2,396
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 7,685 8,115
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 2,592 2,723
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 729 786
Consumer real estate | Greater than or equal to 740 | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 132,632 128,374
Consumer real estate | Greater than or equal to 740 | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 5,355 6,001
Consumer real estate | Greater than or equal to 740 | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,997 2,007
Consumer real estate | Greater than or equal to 740 | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 31,457 32,590
Consumer real estate | Greater than or equal to 740 | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,384 3,569
Consumer real estate | Greater than or equal to 740 | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 966 1,012
Consumer real estate | Less than or equal to 90 percent | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 157,236 153,669
Consumer real estate | Less than or equal to 90 percent | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 10,484 12,135
Consumer real estate | Less than or equal to 90 percent | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 6,535 6,872
Consumer real estate | Less than or equal to 90 percent | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 41,498 43,048
Consumer real estate | Less than or equal to 90 percent | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 7,629 7,944
Consumer real estate | Less than or equal to 90 percent | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,691 1,781
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 3,046 3,082
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 783 850
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 530 559
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 488 549
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 985 1,053
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 379 412
Consumer real estate | Greater than 100 percent | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,357 1,322
Consumer real estate | Greater than 100 percent | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 907 1,011
Consumer real estate | Greater than 100 percent | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 525 570
Consumer real estate | Greater than 100 percent | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 582 648
Consumer real estate | Greater than 100 percent | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,581 1,786
Consumer real estate | Greater than 100 percent | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 475 523
Consumer real estate | Fully Insured Loans | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 17,939 18,545
Consumer real estate | Fully Insured Loans | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 4,770 5,196
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