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Loans - Summary of TDRs in Consumer Portfolio (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]    
Total loans $ 61,526 $ 62,088
Consumer Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Current fiscal year 1,393 4,666
Fiscal year before current fiscal year 4,420 2,566
Two years before current fiscal year 2,343 1,465
Three years before current fiscal year 1,342 1,694
Four years before current fiscal year 1,546 1,985
Prior 8,343 6,991
Revolving Loans 987 1,122
Total loans 20,374 20,489
Consumer Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Current fiscal year 1,365 4,529
Fiscal year before current fiscal year 4,289 2,476
Two years before current fiscal year 2,260 1,431
Three years before current fiscal year 1,308 1,658
Four years before current fiscal year 1,511 1,930
Prior 7,692 6,353
Revolving Loans 0 0
Total loans 18,425 18,377
Consumer Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Current fiscal year 3 50
Fiscal year before current fiscal year 51 51
Two years before current fiscal year 50 34
Three years before current fiscal year 33 35
Four years before current fiscal year 34 47
Prior 527 510
Revolving Loans 0 0
Total loans 698 727
Consumer Loans [Member] | Credit Cards [Member]    
Financing Receivable, Impaired [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Revolving Loans 937 1,066
Total loans 937 1,066
Consumer Loans [Member] | Troubled Debt Restructuring [Member]    
Financing Receivable, Impaired [Line Items]    
Current fiscal year 0 3
Fiscal year before current fiscal year 3 5
Two years before current fiscal year 6 6
Three years before current fiscal year 11 3
Four years before current fiscal year 3 2
Prior 593 594
Revolving Loans 5 5
Total loans 621 618
Consumer Loans [Member] | Troubled Debt Restructuring [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Current fiscal year 0 3
Fiscal year before current fiscal year 3 5
Two years before current fiscal year 6 6
Three years before current fiscal year 11 3
Four years before current fiscal year 3 2
Prior 562 563
Revolving Loans 0 0
Total loans 585 582
Consumer Loans [Member] | Troubled Debt Restructuring [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 31 31
Revolving Loans 0 0
Total loans 31 31
Consumer Loans [Member] | Troubled Debt Restructuring [Member] | Credit Cards [Member]    
Financing Receivable, Impaired [Line Items]    
Current fiscal year 0 0
Fiscal year before current fiscal year 0 0
Two years before current fiscal year 0 0
Three years before current fiscal year 0 0
Four years before current fiscal year 0 0
Prior 0 0
Revolving Loans 5 5
Total loans $ 5 $ 5