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Loans - Summary of TDRs in Consumer Portfolio (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Total loans $ 66,409 $ 68,553
Consumer Loans [Member]    
Financing Receivable, Impaired [Line Items]    
2020 3,661  
2019 2,737  
2018 1,572  
2017 1,826  
2016 2,137  
Prior 7,527  
Revolving Loans 1,166  
Total loans 20,626 20,342
Consumer Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
2020 3,546  
2019 2,638  
2018 1,531  
2017 1,789  
2016 2,084  
Prior 6,851  
Revolving Loans 0  
Total loans 18,439 17,801
Consumer Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
2020 42  
2019 54  
2018 40  
2017 37  
2016 48  
Prior 544  
Revolving Loans 0  
Total loans 765 853
Consumer Loans [Member] | Credit Cards [Member]    
Financing Receivable, Impaired [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 1,107  
Total loans 1,107 1,405
Consumer Loans [Member] | Troubled Debt Restructuring [Member]    
Financing Receivable, Impaired [Line Items]    
2020 0  
2019 2  
2018 2  
2017 1  
2016 2  
Prior 577  
Revolving Loans 5  
Total loans 589 616
Consumer Loans [Member] | Troubled Debt Restructuring [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
2020 0  
2019 2  
2018 2  
2017 1  
2016 2  
Prior 546  
Revolving Loans 0  
Total loans 553 580
Consumer Loans [Member] | Troubled Debt Restructuring [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 31  
Revolving Loans 0  
Total loans 31 32
Consumer Loans [Member] | Troubled Debt Restructuring [Member] | Credit Cards [Member]    
Financing Receivable, Impaired [Line Items]    
2020 0  
2019 0  
2018 0  
2017 0  
2016 0  
Prior 0  
Revolving Loans 5  
Total loans $ 5 $ 4