Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Consumer Real Estate - TDRs Entered into During the Period (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Consumer Real Estate - TDRs Entered into During the Period (Details) - Consumer real estate - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 115 $ 182 $ 350 $ 497
Carrying Value $ 98 $ 152 $ 289 $ 395
Pre-Modification Interest Rate 4.08% 4.48% 4.03% 4.49%
Post-Modification Interest Rate 4.00% 4.44% 3.87% 4.32%
Residential Mortgage        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 103 $ 148 $ 294 $ 368
Carrying Value $ 88 $ 125 $ 244 $ 301
Pre-Modification Interest Rate 4.06% 4.29% 4.07% 4.24%
Post-Modification Interest Rate 3.99% 4.25% 3.90% 4.22%
Home Equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 12 $ 34 $ 56 $ 129
Carrying Value $ 10 $ 27 $ 45 $ 94
Pre-Modification Interest Rate 4.25% 5.28% 3.85% 5.19%
Post-Modification Interest Rate 4.08% 5.27% 3.73% 4.60%