Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Unpaid Principal Balance $ 819 $ 605 $ 1,263
Carrying Value $ 715 $ 478 $ 999
Pre-Modification Interest Rate 3.66% 4.39% 4.38%
Post-Modification Interest Rate 3.59% 4.17% 4.03%
Residential mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Unpaid Principal Balance $ 732 $ 464 $ 774
Carrying Value $ 646 $ 377 $ 641
Pre-Modification Interest Rate 3.66% 4.19% 4.33%
Post-Modification Interest Rate 3.59% 4.13% 4.21%
Home equity      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Unpaid Principal Balance $ 87 $ 141 $ 489
Carrying Value $ 69 $ 101 $ 358
Pre-Modification Interest Rate 3.67% 5.04% 4.46%
Post-Modification Interest Rate 3.61% 4.31% 3.74%