Loans - Credit Risk Profile of Commercial Loans (Detail) - USD ($) $ in Millions		Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total	[1]	$ 61,798	$ 55,864
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
2022		4,068	3,735
2021		3,066	2,458
2020		2,360	3,778
2019		3,429	2,590
2018		2,439	1,184
Prior		12,202	11,747
Revolving Loans		16,865	14,071
Revolving Loans Converted to Term Loans		266	233
Total		44,695	39,796
Commercial loans | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,126	969
2021		1,085	653
2020		623	2,516
2019		2,179	2,116
2018		1,914	593
Prior		1,805	1,325
Revolving Loans		44	46
Revolving Loans Converted to Term Loans		15	16
Total		8,791	8,234
Commercial loans | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
2022		484	1,630
2021		1,270	713
2020		574	608
2019		657	220
2018		233	238
Prior		4,789	4,757
Revolving Loans		7,850	5,575
Revolving Loans Converted to Term Loans		251	217
Total		16,108	13,958
Commercial loans | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
2022		2,390	547
2021		553	540
2020		566	203
2019		178	80
2018		114	243
Prior		4,561	4,620
Revolving Loans		4,601	4,876
Revolving Loans Converted to Term Loans		0	0
Total		12,963	11,109
Commercial loans | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2022		68	589
2021		158	552
2020		597	451
2019		415	174
2018		178	110
Prior		1,047	1,045
Revolving Loans		4,370	3,574
Revolving Loans Converted to Term Loans		0	0
Total		6,833	6,495
Commercial loans | Investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2022		2,561	1,532
2021		1,421	1,596
2020		1,450	1,073
2019		1,113	1,062
2018		1,013	404
Prior		7,050	7,223
Revolving Loans		12,039	10,277
Revolving Loans Converted to Term Loans		54	55
Total		26,701	23,222
Commercial loans | Investment grade | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
2022		73	1
2021		45	361
2020		310	491
2019		496	772
2018		719	57
Prior		343	248
Revolving Loans		12	12
Revolving Loans Converted to Term Loans		0	0
Total		1,998	1,942
Commercial loans | Investment grade | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
2022		263	881
2021		724	254
2020		302	240
2019		352	52
2018		37	43
Prior		2,391	2,122
Revolving Loans		3,849	2,498
Revolving Loans Converted to Term Loans		54	55
Total		7,972	6,145
Commercial loans | Investment grade | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
2022		2,165	530
2021		547	539
2020		340	189
2019		150	64
2018		85	235
Prior		3,455	3,910
Revolving Loans		3,968	4,240
Revolving Loans Converted to Term Loans		0	0
Total		10,710	9,707
Commercial loans | Investment grade | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2022		60	120
2021		105	442
2020		498	153
2019		115	174
2018		172	69
Prior		861	943
Revolving Loans		4,210	3,527
Revolving Loans Converted to Term Loans		0	0
Total		6,021	5,428
Commercial loans | Non-investment grade
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,507	2,203
2021		1,645	862
2020		910	2,705
2019		2,316	1,528
2018		1,426	780
Prior		5,152	4,524
Revolving Loans		4,826	3,794
Revolving Loans Converted to Term Loans		212	178
Total		17,994	16,574
Commercial loans | Non-investment grade | Real estate, including construction
Financing Receivable, Credit Quality Indicator [Line Items]
2022		1,053	968
2021		1,040	292
2020		313	2,025
2019		1,683	1,344
2018		1,195	536
Prior		1,462	1,077
Revolving Loans		32	34
Revolving Loans Converted to Term Loans		15	16
Total		6,793	6,292
Commercial loans | Non-investment grade | Business and corporate banking
Financing Receivable, Credit Quality Indicator [Line Items]
2022		221	749
2021		546	459
2020		272	368
2019		305	168
2018		196	195
Prior		2,398	2,635
Revolving Loans		4,001	3,077
Revolving Loans Converted to Term Loans		197	162
Total		8,136	7,813
Commercial loans | Non-investment grade | Global banking
Financing Receivable, Credit Quality Indicator [Line Items]
2022		225	17
2021		6	1
2020		226	14
2019		28	16
2018		29	8
Prior		1,106	710
Revolving Loans		633	636
Revolving Loans Converted to Term Loans		0	0
Total		2,253	1,402
Commercial loans | Non-investment grade | Other commercial
Financing Receivable, Credit Quality Indicator [Line Items]
2022		8	469
2021		53	110
2020		99	298
2019		300	0
2018		6	41
Prior		186	102
Revolving Loans		160	47
Revolving Loans Converted to Term Loans		0	0
Total		$ 812	$ 1,067

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at June 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. June 30, 2022December 31, 2021(in millions)AssetsLoans$118 $46 Other assets46 55 Total assets$164 $101 LiabilitiesInterest, taxes and other liabilities$28 $9 Total liabilities$28 $9