Loans - Delinquency Ratio for Consumer Loan (Detail) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total	[1]	$ 55,864	$ 62,088
Residential Mortgage Loan Delinquency Carried At Lower Of Amortized Cost Or Fair Value Less Cost To Sell		24	281
Consumer loans:
Financing Receivable, Credit Quality Indicator [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
Mortgage Loans in Process of Foreclosure, Amount		87	109
Consumer loans: | Residential mortgages
Financing Receivable, Credit Quality Indicator [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, Credit Quality Indicator [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, Credit Quality Indicator [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: | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021		8	87
2020		8	39
2019		5	0
2018		1	1
2017		1	8
Prior		45	128
Revolving Loans		2	56
Total		70	319
Consumer loans: | Summary of Two Months and Over Contractual Delinquency
Financing Receivable, Credit Quality Indicator [Line Items]
2021		5	4
2020		2	16
2019		11	13
2018		13	25
2017		8	19
Prior		65	358
Revolving Loans		3	30
Total		107	465
Consumer loans: | Summary of Two Months and Over Contractual Delinquency | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2021		5	3
2020		2	15
2019		11	13
2018		13	25
2017		8	19
Prior		64	329
Revolving Loans		0	0
Total		103	404
Consumer loans: | Summary of Two Months and Over Contractual Delinquency | Home equity mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
2021		0	0
2020		0	0
2019		0	0
2018		0	0
2017		0	0
Prior		1	25
Revolving Loans		0	0
Total		1	25
Consumer loans: | Summary of Two Months and Over Contractual Delinquency | Credit cards
Financing Receivable, Credit Quality Indicator [Line Items]
2021		0	0
2020		0	0
2019		0	0
2018		0	0
2017		0	0
Prior		0	0
Revolving Loans		3	28
Total		3	28
Consumer loans: | Summary of Two Months and Over Contractual Delinquency | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2021		0	1
2020		0	1
2019		0	0
2018		0	0
2017		0	0
Prior		0	4
Revolving Loans		0	2
Total		$ 0	$ 8

[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