Loans - Summary of TDRs in Consumer Portfolio (Detail) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Impaired [Line Items]
Total	[1]	$ 55,864	$ 62,088
Consumer loans:
Financing Receivable, Impaired [Line Items]
2021		4,521	4,666
2020		3,343	2,566
2019		1,531	1,465
2018		891	1,694
2017		987	1,985
Prior		4,589	6,991
Revolving Loans		206	1,122
Total		16,068	20,489
Consumer loans: | Residential mortgages
Financing Receivable, Impaired [Line Items]
2021		4,498	4,529
2020		3,305	2,476
2019		1,496	1,431
2018		872	1,658
2017		969	1,930
Prior		4,329	6,353
Revolving Loans		0	0
Total		15,469	18,377
Consumer loans: | Home equity mortgages
Financing Receivable, Impaired [Line Items]
2021		15	50
2020		30	51
2019		30	34
2018		18	35
2017		17	47
Prior		215	510
Revolving Loans		0	0
Total		325	727
Consumer loans: | Credit cards
Financing Receivable, Impaired [Line Items]
2021		0	0
2020		0	0
2019		0	0
2018		0	0
2017		0	0
Prior		0	0
Revolving Loans		204	1,066
Total		204	1,066
Consumer loans: | Troubled Debt Restructuring
Financing Receivable, Impaired [Line Items]
2021		0	3
2020		1	5
2019		3	6
2018		3	3
2017		0	2
Prior		127	594
Revolving Loans		3	5
Total		137	618
Consumer loans: | Troubled Debt Restructuring | Residential mortgages
Financing Receivable, Impaired [Line Items]
2021		0	3
2020		1	5
2019		3	6
2018		3	3
2017		0	2
Prior		118	563
Revolving Loans		0	0
Total		125	582
Consumer loans: | Troubled Debt Restructuring | Home equity mortgages
Financing Receivable, Impaired [Line Items]
2021		0	0
2020		0	0
2019		0	0
2018		0	0
2017		0	0
Prior		9	31
Revolving Loans		0	0
Total		9	31
Consumer loans: | Troubled Debt Restructuring | Credit cards
Financing Receivable, Impaired [Line Items]
2021		0	0
2020		0	0
2019		0	0
2018		0	0
2017		0	0
Prior		0	0
Revolving Loans		3	5
Total		$ 3	$ 5

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at December 31, 2021 and 2020. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 27, "Variable Interest Entities," for additional information. At December 31,20212020(in millions)AssetsLoans$46 $10 Other assets55 79 Total assets$101 $89 LiabilitiesInterest, taxes and other liabilities$9 $10 Total liabilities$9 $10