Loans - Schedule of Credit Quality Indicators for Term Loans by Origination Year (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 133,808	$ 119,989
Percentage of total	100.00%	100.00%
Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 119,311	$ 103,565
Amortized cost [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 110,844	$ 95,472
Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total	37.00%	35.00%
Investment-Grade [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 41,387	$ 33,532
Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total	58.00%	61.00%
Non-Investment-Grade [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 64,523	$ 58,250
Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total	5.00%	4.00%
Other/Unrated [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 4,934	$ 3,690
Corporate [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	6,166	9,663
2020 and 2019	7,353	6,995
2019 and 2018	5,623	5,631
2018 and 2017	4,870	3,934
2017 and 2016	3,127	1,530
2016 and 2015 or earlier	3,060	2,424
Revolving	13,954	14,601
Loans, gross	44,153	44,778
Corporate [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	2,357	1,978
2020 and 2019	1,466	889
2019 and 2018	601	2,076
2018 and 2017	1,864	851
2017 and 2016	803	268
2016 and 2015 or earlier	369	351
Revolving	3,316	2,662
Loans, gross	10,776	9,075
Corporate [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	3,683	7,545
2020 and 2019	5,887	6,106
2019 and 2018	5,022	3,555
2018 and 2017	3,006	3,083
2017 and 2016	2,324	1,262
2016 and 2015 or earlier	2,646	2,073
Revolving	10,562	11,891
Loans, gross	33,130	35,515
Corporate [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	126	140
2016 and 2015 or earlier	45
Revolving	76	48
Loans, gross	247	188
Wealth management [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	1,314	810
2020 and 2019	798	1,126
2019 and 2018	1,105	385
2018 and 2017	400	407
2017 and 2016	403	42
2016 and 2015 or earlier	836	795
Revolving	27,977	21,586
Loans, gross	32,833	25,151
Wealth management [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	454	497
2020 and 2019	551	723
2019 and 2018	725	298
2018 and 2017	270	377
2017 and 2016	373	22
2016 and 2015 or earlier	585	531
Revolving	23,828	18,077
Loans, gross	26,786	20,525
Wealth management [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	326	313
2020 and 2019	247	403
2019 and 2018	380	87
2018 and 2017	130	30
2017 and 2016	30	20
2016 and 2015 or earlier	251	264
Revolving	2,214	2,085
Loans, gross	3,578	3,202
Wealth management [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	534
Revolving	1,935	1,424
Loans, gross	2,469	1,424
Commercial real estate [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	2,402	3,974
2020 and 2019	3,559	2,041
2019 and 2018	1,888	2,326
2018 and 2017	1,816	1,772
2017 and 2016	1,494	174
2016 and 2015 or earlier	1,247	1,301
Revolving	4,915	5,508
Loans, gross	17,321	17,096
Commercial real estate [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	191	848
2020 and 2019	580	76
2019 and 2018	70	137
2018 and 2017	134	26
2017 and 2016	26
Revolving	404	461
Loans, gross	1,405	1,548
Commercial real estate [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	2,129	3,071
2020 and 2019	2,965	1,965
2019 and 2018	1,818	2,164
2018 and 2017	1,675	1,734
2017 and 2016	1,458	165
2016 and 2015 or earlier	782	775
Revolving	4,499	5,047
Loans, gross	15,326	14,921
Commercial real estate [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	82	55
2020 and 2019	14
2019 and 2018		25
2018 and 2017	7	12
2017 and 2016	10	9
2016 and 2015 or earlier	465	526
Revolving	12
Loans, gross	590	627
Residential real estate [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	838	1,493
2020 and 2019	1,102	361
2019 and 2018	257	372
2018 and 2017	294	244
2017 and 2016	199	1
2016 and 2015 or earlier	63	70
Revolving	8,943	2,695
Loans, gross	11,696	5,236
Residential real estate [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	413	402
2018 and 2017		9
2017 and 2016	8
Revolving	175	225
Loans, gross	596	636
Residential real estate [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	309	976
2020 and 2019	986	90
2019 and 2018	34	123
2018 and 2017	104	83
2017 and 2016	55	1
2016 and 2015 or earlier	1
Revolving	8,656	2,470
Loans, gross	10,145	3,743
Residential real estate [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	116	115
2020 and 2019	116	271
2019 and 2018	223	249
2018 and 2017	190	152
2017 and 2016	136
2016 and 2015 or earlier	62	70
Revolving	112
Loans, gross	955	857
Other [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	721	792
2020 and 2019	485	96
2019 and 2018	53	46
2018 and 2017	215	8
2017 and 2016	14
Revolving	3,353	2,269
Loans, gross	4,841	3,211
Other [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	243	242
Revolving	1,581	1,506
Loans, gross	1,824	1,748
Other [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	377	84
2020 and 2019	64	67
2019 and 2018	29	46
2018 and 2017	183	8
2017 and 2016	6
Revolving	1,685	664
Loans, gross	2,344	869
Other [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2021 and 2020	101	466
2020 and 2019	421	29
2019 and 2018	24
2018 and 2017	32
2017 and 2016	8
Revolving	87	99
Loans, gross	$ 673	$ 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=121647567&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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Amount of financing receivable originated in fiscal year prior to current fiscal year.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=121599337&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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