Loans - Schedule of Credit Quality Indicators for Term Loans by Origination Year (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 162,135	$ 119,989
Percentage of total	100.00%	100.00%
Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 143,507	$ 103,565
Amortized cost [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 131,623	$ 95,472
Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total	39.00%	35.00%
Investment-Grade [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 50,923	$ 33,532
Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total	57.00%	61.00%
Non-Investment-Grade [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 75,179	$ 58,250
Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total	4.00%	4.00%
Other/Unrated [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 5,521	$ 3,690
Corporate [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	15,163	9,663
2020 and 2019	6,479	6,995
2019 and 2018	4,400	5,631
2018 and 2017	4,743	3,934
2017 and 2016	2,590	1,530
2016 and 2015 or earlier	1,967	2,424
Revolving	15,618	14,601
Loans, gross	50,960	44,778
Corporate [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	4,687	1,978
2020 and 2019	1,911	889
2019 and 2018	451	2,076
2018 and 2017	1,842	851
2017 and 2016	733	268
2016 and 2015 or earlier	274	351
Revolving	3,800	2,662
Loans, gross	13,698	9,075
Corporate [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	10,424	7,545
2020 and 2019	4,561	6,106
2019 and 2018	3,949	3,555
2018 and 2017	2,901	3,083
2017 and 2016	1,857	1,262
2016 and 2015 or earlier	1,693	2,073
Revolving	11,744	11,891
Loans, gross	37,129	35,515
Corporate [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	52	140
2020 and 2019	7	0
2019 and 2018	0	0
2018 and 2017	0	0
2017 and 2016	0	0
2016 and 2015 or earlier	0	0
Revolving	74	48
Loans, gross	133	188
Wealth management [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	3,856	810
2020 and 2019	845	1,126
2019 and 2018	889	385
2018 and 2017	372	407
2017 and 2016	411	42
2016 and 2015 or earlier	808	795
Revolving	30,881	21,586
Loans, gross	38,062	25,151
Wealth management [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	1,405	497
2020 and 2019	558	723
2019 and 2018	537	298
2018 and 2017	334	377
2017 and 2016	380	22
2016 and 2015 or earlier	565	531
Revolving	26,349	18,077
Loans, gross	30,128	20,525
Wealth management [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	1,186	313
2020 and 2019	287	403
2019 and 2018	352	87
2018 and 2017	38	30
2017 and 2016	31	20
2016 and 2015 or earlier	243	264
Revolving	2,127	2,085
Loans, gross	4,264	3,202
Wealth management [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	1,265	0
2020 and 2019	0	0
2019 and 2018	0	0
2018 and 2017	0	0
2017 and 2016	0	0
2016 and 2015 or earlier	0	0
Revolving	2,405	1,424
Loans, gross	3,670	1,424
Commercial real estate [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	4,512	3,974
2020 and 2019	2,017	2,041
2019 and 2018	1,388	2,326
2018 and 2017	1,036	1,772
2017 and 2016	1,022	174
2016 and 2015 or earlier	995	1,301
Revolving	10,180	5,508
Loans, gross	21,150	17,096
Commercial real estate [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	334	848
2020 and 2019	127	76
2019 and 2018	52	137
2018 and 2017	207	26
2017 and 2016	398	0
2016 and 2015 or earlier	405	0
Revolving	1,768	461
Loans, gross	3,291	1,548
Commercial real estate [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	4,084	3,071
2020 and 2019	1,890	1,965
2019 and 2018	1,336	2,164
2018 and 2017	829	1,734
2017 and 2016	624	165
2016 and 2015 or earlier	583	775
Revolving	8,412	5,047
Loans, gross	17,758	14,921
Commercial real estate [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	94	55
2020 and 2019	0	0
2019 and 2018	0	25
2018 and 2017	0	12
2017 and 2016	0	9
2016 and 2015 or earlier	7	526
Revolving	0	0
Loans, gross	101	627
Residential real estate [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	2,310	1,493
2020 and 2019	920	361
2019 and 2018	173	372
2018 and 2017	249	244
2017 and 2016	192	1
2016 and 2015 or earlier	57	70
Revolving	11,592	2,695
Loans, gross	15,493	5,236
Residential real estate [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	113	402
2020 and 2019	260	0
2019 and 2018	0	0
2018 and 2017	0	9
2017 and 2016	8	0
2016 and 2015 or earlier	0	0
Revolving	673	225
Loans, gross	1,054	636
Residential real estate [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	1,944	976
2020 and 2019	557	90
2019 and 2018	0	123
2018 and 2017	84	83
2017 and 2016	65	1
2016 and 2015 or earlier	1	0
Revolving	10,919	2,470
Loans, gross	13,570	3,743
Residential real estate [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	253	115
2020 and 2019	103	271
2019 and 2018	173	249
2018 and 2017	165	152
2017 and 2016	119	0
2016 and 2015 or earlier	56	70
Revolving	0	0
Loans, gross	869	857
Other [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	955	792
2020 and 2019	437	96
2019 and 2018	44	46
2018 and 2017	30	8
2017 and 2016	13
Revolving	4,479	2,269
Loans, gross	5,958	3,211
Other [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	0	242
2020 and 2019	0	0
2019 and 2018	0	0
2018 and 2017	0	0
2017 and 2016	0
Revolving	2,752	1,506
Loans, gross	2,752	1,748
Other [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	694	84
2020 and 2019	59	67
2019 and 2018	25	46
2018 and 2017	30	8
2017 and 2016	5
Revolving	1,645	664
Loans, gross	2,458	869
Other [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	261	466
2020 and 2019	378	29
2019 and 2018	19	0
2018 and 2017	0	0
2017 and 2016	8
Revolving	82	99
Loans, gross	$ 748	$ 594

Percentage of Loans and Lease Receivable excluding installment and credit card.

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- Definition

Amount of financing receivable originated more than five years prior to current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

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Amount of financing receivable originated four years prior to current fiscal year.

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Amount of financing receivable originated in current fiscal year.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
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-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447

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-Publisher FASB
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Amount of financing receivable originated three years prior to current fiscal year.

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Amount of financing receivable originated two years prior to current fiscal year.

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- Definition

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Amount of financing receivable that can be withdrawn, repaid and redrawn.

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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