Loans - Schedule of Credit Quality Indicators for Term Loans by Origination Year (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 146,956	$ 119,989
Percentage of total	100.00%	100.00%
Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 129,358	$ 103,565
Amortized cost [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 119,658	$ 95,472
Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total	40.00%	35.00%
Investment-Grade [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 47,429	$ 33,532
Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total	56.00%	61.00%
Non-Investment-Grade [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 67,434	$ 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	$ 4,795	$ 3,690
Corporate [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	11,127	9,663
2020 and 2019	7,523	6,995
2019 and 2018	4,835	5,631
2018 and 2017	4,818	3,934
2017 and 2016	2,784	1,530
2016 and 2015 or earlier	2,415	2,424
Revolving	15,441	14,601
Loans, gross	48,943	44,778
Corporate [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	2,910	1,978
2020 and 2019	2,241	889
2019 and 2018	458	2,076
2018 and 2017	1,853	851
2017 and 2016	755	268
2016 and 2015 or earlier	258	351
Revolving	4,127	2,662
Loans, gross	12,602	9,075
Corporate [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	8,217	7,545
2020 and 2019	5,263	6,106
2019 and 2018	4,377	3,555
2018 and 2017	2,965	3,083
2017 and 2016	2,029	1,262
2016 and 2015 or earlier	2,157	2,073
Revolving	11,249	11,891
Loans, gross	36,257	35,515
Corporate [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020		140
2020 and 2019	19
Revolving	65	48
Loans, gross	84	188
Wealth management [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	2,460	810
2020 and 2019	785	1,126
2019 and 2018	1,036	385
2018 and 2017	426	407
2017 and 2016	400	42
2016 and 2015 or earlier	825	795
Revolving	29,227	21,586
Loans, gross	35,159	25,151
Wealth management [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	967	497
2020 and 2019	537	723
2019 and 2018	636	298
2018 and 2017	320	377
2017 and 2016	369	22
2016 and 2015 or earlier	578	531
Revolving	24,796	18,077
Loans, gross	28,203	20,525
Wealth management [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	618	313
2020 and 2019	248	403
2019 and 2018	400	87
2018 and 2017	106	30
2017 and 2016	31	20
2016 and 2015 or earlier	247	264
Revolving	2,273	2,085
Loans, gross	3,923	3,202
Wealth management [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	875
Revolving	2,158	1,424
Loans, gross	3,033	1,424
Commercial real estate [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	3,077	3,974
2020 and 2019	2,516	2,041
2019 and 2018	1,532	2,326
2018 and 2017	1,267	1,772
2017 and 2016	1,193	174
2016 and 2015 or earlier	1,177	1,301
Revolving	7,130	5,508
Loans, gross	17,892	17,096
Commercial real estate [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	329	848
2020 and 2019	322	76
2019 and 2018	72	137
2018 and 2017	212	26
2017 and 2016	453
2016 and 2015 or earlier	419
Revolving	1,096	461
Loans, gross	2,903	1,548
Commercial real estate [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	2,715	3,071
2020 and 2019	2,194	1,965
2019 and 2018	1,460	2,164
2018 and 2017	1,055	1,734
2017 and 2016	740	165
2016 and 2015 or earlier	741	775
Revolving	6,034	5,047
Loans, gross	14,939	14,921
Commercial real estate [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	33	55
2019 and 2018		25
2018 and 2017		12
2017 and 2016		9
2016 and 2015 or earlier	17	526
Loans, gross	50	627
Residential real estate [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	615	1,493
2020 and 2019	671	361
2019 and 2018	208	372
2018 and 2017	270	244
2017 and 2016	188	1
2016 and 2015 or earlier	59	70
Revolving	10,345	2,695
Loans, gross	12,356	5,236
Residential real estate [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	381	402
2020 and 2019	287
2018 and 2017		9
2017 and 2016	8
Revolving	435	225
Loans, gross	1,111	636
Residential real estate [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	43	976
2020 and 2019	274	90
2019 and 2018	3	123
2018 and 2017	93	83
2017 and 2016	53	1
2016 and 2015 or earlier	1
Revolving	9,910	2,470
Loans, gross	10,377	3,743
Residential real estate [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	191	115
2020 and 2019	110	271
2019 and 2018	205	249
2018 and 2017	177	152
2017 and 2016	127
2016 and 2015 or earlier	58	70
Loans, gross	868	857
Other [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	778	792
2020 and 2019	475	96
2019 and 2018	52	46
2018 and 2017	33	8
2017 and 2016	15
Revolving	3,955	2,269
Loans, gross	5,308	3,211
Other [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	104	242
Revolving	2,506	1,506
Loans, gross	2,610	1,748
Other [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	428	84
2020 and 2019	75	67
2019 and 2018	31	46
2018 and 2017	33	8
2017 and 2016	6
Revolving	1,365	664
Loans, gross	1,938	869
Other [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	246	466
2020 and 2019	400	29
2019 and 2018	21
2017 and 2016	9
Revolving	84	99
Loans, gross	$ 760	$ 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
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447

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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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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

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