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Loans - Summary of TDRs in Consumer Portfolio (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Total loans $ 72,468 $ 68,553
Consumer Loans [Member]    
Financing Receivable, Impaired [Line Items]    
2020 2,389  
2019 2,902  
2018 1,723  
2017 1,974  
2016 2,292  
Prior 8,034  
Revolving Loans 1,241  
Total loans 20,555 20,342
Consumer Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
2020 2,304  
2019 2,790  
2018 1,679  
2017 1,933  
2016 2,239  
Prior 7,336  
Revolving Loans 0  
Total loans 18,281 17,801
Consumer Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
2020 27  
2019 54  
2018 43  
2017 39  
2016 50  
Prior 579  
Revolving Loans 0  
Total loans 792 853
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 1,175  
Total loans 1,175 1,405
Consumer Loans [Member] | Troubled Debt Restructuring [Member]    
Financing Receivable, Impaired [Line Items]    
2020 0  
2019 0  
2018 0  
2017 1  
2016 1  
Prior 578  
Revolving Loans 5  
Total loans 585 616
Consumer Loans [Member] | Troubled Debt Restructuring [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
2020 0  
2019 0  
2018 0  
2017 1  
2016 1  
Prior 547  
Revolving Loans 0  
Total loans 549 580
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