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, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 946,895 $ 936,749
Estimate of Fair Value Measurement    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 4,349 5,710
Consumer real estate | Estimate of Fair Value Measurement    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 682 928
Consumer real estate | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 193,695 176,618
Consumer real estate | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 11,062 19,192
Consumer real estate | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,800 8,001
Consumer real estate | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 40,010 44,245
Consumer real estate | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 7,431 10,783
Consumer real estate | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 845 2,716
Consumer real estate | Less than 620 | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,125 2,234
Consumer real estate | Less than 620 | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,264 2,390
Consumer real estate | Less than 620 | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 710 1,941
Consumer real estate | Less than 620 | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,064 1,169
Consumer real estate | Less than 620 | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,325 2,098
Consumer real estate | Less than 620 | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 178 452
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 4,538 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 1,068 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 651 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 2,008 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 1,575 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 145 466
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 23,841 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 1,841 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 1,201 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 7,008 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 1,968 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 220 786
Consumer real estate | Greater than or equal to 740 | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 146,573 128,374
Consumer real estate | Greater than or equal to 740 | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,377 6,001
Consumer real estate | Greater than or equal to 740 | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,238 2,007
Consumer real estate | Greater than or equal to 740 | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 29,930 32,590
Consumer real estate | Greater than or equal to 740 | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 2,563 3,569
Consumer real estate | Greater than or equal to 740 | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 302 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 173,911 153,669
Consumer real estate | Less than or equal to 90 percent | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 6,861 12,135
Consumer real estate | Less than or equal to 90 percent | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 3,411 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 39,246 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 5,870 7,944
Consumer real estate | Less than or equal to 90 percent | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 608 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 2,349 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 340 850
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 193 559
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 354 549
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 603 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 112 412
Consumer real estate | Greater than 100 percent | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 817 1,322
Consumer real estate | Greater than 100 percent | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 349 1,011
Consumer real estate | Greater than 100 percent | Residential Mortgage PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 196 570
Consumer real estate | Greater than 100 percent | Core Portfolio Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 410 648
Consumer real estate | Greater than 100 percent | Non-core Home Equity    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 958 1,786
Consumer real estate | Greater than 100 percent | Home Equity PCI    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 125 523
Consumer real estate | Fully Insured Loans | Core Portfolio Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 16,618 18,545
Consumer real estate | Fully Insured Loans | Non-core Residential Mortgage    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 3,512 $ 5,196