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Loans - Summary of TDRs in Consumer Portfolio (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Total loans $ 62,088 $ 68,553
Consumer Loans [Member]    
Financing Receivable, Impaired [Line Items]    
2020 4,666  
2019 2,566  
2018 1,465  
2017 1,694  
2016 1,985  
Prior 6,991  
Revolving Loans 1,122  
Total loans 20,489 20,342
Consumer Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
2020 4,529  
2019 2,476  
2018 1,431  
2017 1,658  
2016 1,930  
Prior 6,353  
Revolving Loans 0  
Total loans 18,377 17,801
Consumer Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
2020 50  
2019 51  
2018 34  
2017 35  
2016 47  
Prior 510  
Revolving Loans 0  
Total loans 727 [1] 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 1,066  
Total loans 1,066 [2] 1,405
Consumer Loans [Member] | Troubled Debt Restructuring [Member]    
Financing Receivable, Impaired [Line Items]    
2020 3  
2019 5  
2018 6  
2017 3  
2016 2  
Prior 594  
Revolving Loans 5  
Total loans 618 616
Consumer Loans [Member] | Troubled Debt Restructuring [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
2020 3  
2019 5  
2018 6  
2017 3  
2016 2  
Prior 563  
Revolving Loans 0  
Total loans 582 580
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
[1] Home equity mortgage maturities reflect estimates based on historical payment patterns.
[2] As credit card receivables do not have stated maturities, the table reflects an average estimate based on historical payment patterns