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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 512 $ 115 $ 929 $ 350
Carrying Value $ 444 $ 98 $ 815 $ 289
Pre-Modification Interest Rate 3.52% 4.08% 3.50% 4.03%
Post-Modification Interest Rate 3.49% 4.00% 3.46% 3.87%
Residential Mortgage        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 451 $ 103 $ 832 $ 294
Carrying Value $ 399 $ 88 $ 742 $ 244
Pre-Modification Interest Rate 3.52% 4.06% 3.49% 4.07%
Post-Modification Interest Rate 3.49% 3.99% 3.44% 3.90%
Home equity        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Unpaid Principal Balance $ 61 $ 12 $ 97 $ 56
Carrying Value $ 45 $ 10 $ 73 $ 45
Pre-Modification Interest Rate 3.51% 4.25% 3.56% 3.85%
Post-Modification Interest Rate 3.51% 4.08% 3.58% 3.73%