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, 2019
Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases $ 983,426 $ 946,895
Estimate of Fair Value Measurement    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 8,335 4,349
Consumer real estate | Estimate of Fair Value Measurement    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 594 682
Consumer real estate | Core Portfolio Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 225,770 193,695
Consumer real estate | Non-core Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 10,399 14,862
Consumer real estate | Core Portfolio Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 35,226 40,010
Consumer real estate | Non-core Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 4,982 8,276
Consumer real estate | Less than 620 | Core Portfolio Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 2,127 2,125
Consumer real estate | Less than 620 | Non-core Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,230 1,974
Consumer real estate | Less than 620 | Core Portfolio Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 751 1,064
Consumer real estate | Less than 620 | Non-core Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 541 1,503
Consumer real estate | Greater than or equal to 620 and less than 680 | Core Portfolio Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 4,821 4,538
Consumer real estate | Greater than or equal to 620 and less than 680 | Non-core Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,053 1,719
Consumer real estate | Greater than or equal to 620 and less than 680 | Core Portfolio Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,550 2,008
Consumer real estate | Greater than or equal to 620 and less than 680 | Non-core Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 800 1,720
Consumer real estate | Greater than or equal to 680 and less than 740 | Core Portfolio Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 26,905 23,841
Consumer real estate | Greater than or equal to 680 and less than 740 | Non-core Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,981 3,042
Consumer real estate | Greater than or equal to 680 and less than 740 | Core Portfolio Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 6,025 7,008
Consumer real estate | Greater than or equal to 680 and less than 740 | Non-core Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,412 2,188
Consumer real estate | Greater than or equal to 740 | Core Portfolio Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 175,653 146,573
Consumer real estate | Greater than or equal to 740 | Non-core Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 3,709 4,615
Consumer real estate | Greater than or equal to 740 | Core Portfolio Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 26,900 29,930
Consumer real estate | Greater than or equal to 740 | Non-core Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 2,229 2,865
Consumer real estate | Less than or equal to 90 percent | Core Portfolio Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 205,357 173,911
Consumer real estate | Less than or equal to 90 percent | Non-core Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 7,433 10,272
Consumer real estate | Less than or equal to 90 percent | Core Portfolio Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 34,733 39,246
Consumer real estate | Less than or equal to 90 percent | Non-core Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 4,127 6,478
Consumer real estate | Greater than 90 percent but less than or equal to 100 percent | Core Portfolio Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 3,100 2,349
Consumer real estate | Greater than 90 percent but less than or equal to 100 percent | Non-core Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 273 533
Consumer real estate | Greater than 90 percent but less than or equal to 100 percent | Core Portfolio Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 226 354
Consumer real estate | Greater than 90 percent but less than or equal to 100 percent | Non-core Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 348 715
Consumer real estate | Greater than 100 percent | Core Portfolio Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 1,049 817
Consumer real estate | Greater than 100 percent | Non-core Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 267 545
Consumer real estate | Greater than 100 percent | Core Portfolio Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 267 410
Consumer real estate | Greater than 100 percent | Non-core Home Equity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 507 1,083
Consumer real estate | Fully Insured Loans | Core Portfolio Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 16,264 16,618
Consumer real estate | Fully Insured Loans | Non-core Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases $ 2,426 $ 3,512