Loans - Credit Risk Profile of Commercial Loans (Detail) - USD ($) $ in Millions		Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total	[1]	$ 61,775	$ 55,864
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
2022		4,591	3,735
2021		2,929	2,458
2020		2,060	3,778
2019		3,300	2,590
2018		2,360	1,184
Prior		12,286	11,747
Revolving Loans		16,699	14,071
Revolving Loans Converted to Term Loans		242	233
Total		44,467	39,796
Commercial loans | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,271	969
2021		909	653
2020		629	2,516
2019		1,976	2,116
2018		1,825	593
Prior		1,737	1,325
Revolving Loans		44	46
Revolving Loans Converted to Term Loans		4	16
Total		8,395	8,234
Commercial loans | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,017	1,630
2021		1,260	713
2020		402	608
2019		764	220
2018		230	238
Prior		5,036	4,757
Revolving Loans		7,783	5,575
Revolving Loans Converted to Term Loans		238	217
Total		16,730	13,958
Commercial loans | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
2022		2,184	547
2021		454	540
2020		427	203
2019		150	80
2018		129	243
Prior		4,481	4,620
Revolving Loans		4,317	4,876
Revolving Loans Converted to Term Loans		0	0
Total		12,142	11,109
Commercial loans | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2022		119	589
2021		306	552
2020		602	451
2019		410	174
2018		176	110
Prior		1,032	1,045
Revolving Loans		4,555	3,574
Revolving Loans Converted to Term Loans		0	0
Total		7,200	6,495
Commercial loans | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2022		2,681	1,532
2021		1,291	1,596
2020		1,387	1,073
2019		1,141	1,062
2018		1,129	404
Prior		7,063	7,223
Revolving Loans		12,091	10,277
Revolving Loans Converted to Term Loans		45	55
Total		26,828	23,222
Commercial loans | Investment grade | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
2022		79	1
2021		45	361
2020		305	491
2019		496	772
2018		805	57
Prior		296	248
Revolving Loans		12	12
Revolving Loans Converted to Term Loans		0	0
Total		2,038	1,942
Commercial loans | Investment grade | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
2022		517	881
2021		704	254
2020		149	240
2019		416	52
2018		57	43
Prior		2,634	2,122
Revolving Loans		3,883	2,498
Revolving Loans Converted to Term Loans		45	55
Total		8,405	6,145
Commercial loans | Investment grade | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,974	530
2021		443	539
2020		421	189
2019		119	64
2018		99	235
Prior		3,286	3,910
Revolving Loans		3,775	4,240
Revolving Loans Converted to Term Loans		0	0
Total		10,117	9,707
Commercial loans | Investment grade | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2022		111	120
2021		99	442
2020		512	153
2019		110	174
2018		168	69
Prior		847	943
Revolving Loans		4,421	3,527
Revolving Loans Converted to Term Loans		0	0
Total		6,268	5,428
Commercial loans | Non-investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,910	2,203
2021		1,638	862
2020		673	2,705
2019		2,159	1,528
2018		1,231	780
Prior		5,223	4,524
Revolving Loans		4,608	3,794
Revolving Loans Converted to Term Loans		197	178
Total		17,639	16,574
Commercial loans | Non-investment grade | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,192	968
2021		864	292
2020		324	2,025
2019		1,480	1,344
2018		1,020	536
Prior		1,441	1,077
Revolving Loans		32	34
Revolving Loans Converted to Term Loans		4	16
Total		6,357	6,292
Commercial loans | Non-investment grade | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
2022		500	749
2021		556	459
2020		253	368
2019		348	168
2018		173	195
Prior		2,402	2,635
Revolving Loans		3,900	3,077
Revolving Loans Converted to Term Loans		193	162
Total		8,325	7,813
Commercial loans | Non-investment grade | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
2022		210	17
2021		11	1
2020		6	14
2019		31	16
2018		30	8
Prior		1,195	710
Revolving Loans		542	636
Revolving Loans Converted to Term Loans		0	0
Total		2,025	1,402
Commercial loans | Non-investment grade | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2022		8	469
2021		207	110
2020		90	298
2019		300	0
2018		8	41
Prior		185	102
Revolving Loans		134	47
Revolving Loans Converted to Term Loans		0	0
Total		$ 932	$ 1,067

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at September 30, 2022 and December 31, 2021. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 17, "Variable Interest Entities," for additional information. September 30, 2022December 31, 2021(in millions)AssetsLoans$127 $46 Other assets44 55 Total assets$171 $101 LiabilitiesInterest, taxes and other liabilities$26 $9 Total liabilities$26 $9