Loans - Schedule of Credit Quality Indicators for Term Loans by Origination Year (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 119,989	$ 110,345
Percentage of total	100.00%
Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 103,565	$ 90,636
Amortized cost [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 95,472
Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total	35.00%
Investment-Grade [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 33,532
Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total	61.00%
Non-Investment-Grade [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 58,250
Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage of total	4.00%
Other/Unrated [Member] \| All Classes Except Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, gross	$ 3,690
Corporate [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	9,663
2019	6,995
2018	5,631
2017	3,934
2016	1,530
2015 or earlier	2,424
Revolving	14,601
Loans, gross	44,778
Corporate [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	1,978
2019	889
2018	2,076
2017	851
2016	268
2015 or earlier	351
Revolving	2,662
Loans, gross	9,075
Corporate [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	7,545
2019	6,106
2018	3,555
2017	3,083
2016	1,262
2015 or earlier	2,073
Revolving	11,891
Loans, gross	35,515
Corporate [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	140
Revolving	48
Loans, gross	188
Wealth management [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	810
2019	1,126
2018	385
2017	407
2016	42
2015 or earlier	795
Revolving	21,586
Loans, gross	25,151
Wealth management [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	497
2019	723
2018	298
2017	377
2016	22
2015 or earlier	531
Revolving	18,077
Loans, gross	20,525
Wealth management [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	313
2019	403
2018	87
2017	30
2016	20
2015 or earlier	264
Revolving	2,085
Loans, gross	3,202
Wealth management [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
Revolving	1,424
Loans, gross	1,424
Commercial real estate [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	3,974
2019	2,041
2018	2,326
2017	1,772
2016	174
2015 or earlier	1,301
Revolving	5,508
Loans, gross	17,096
Commercial real estate [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	848
2019	76
2018	137
2017	26
Revolving	461
Loans, gross	1,548
Commercial real estate [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	3,071
2019	1,965
2018	2,164
2017	1,734
2016	165
2015 or earlier	775
Revolving	5,047
Loans, gross	14,921
Commercial real estate [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	55
2018	25
2017	12
2016	9
2015 or earlier	526
Loans, gross	627
Residential real estate [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	1,493
2019	361
2018	372
2017	244
2016	1
2015 or earlier	70
Revolving	2,695
Loans, gross	5,236
Residential real estate [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	402
2017	9
Revolving	225
Loans, gross	636
Residential real estate [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	976
2019	90
2018	123
2017	83
2016	1
Revolving	2,470
Loans, gross	3,743
Residential real estate [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	115
2019	271
2018	249
2017	152
2015 or earlier	70
Loans, gross	857
Other [Member] \| Amortized cost [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	792
2019	96
2018	46
2017	8
Revolving	2,269
Loans, gross	3,211
Other [Member] \| Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	242
Revolving	1,506
Loans, gross	1,748
Other [Member] \| Non-Investment-Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	84
2019	67
2018	46
2017	8
Revolving	664
Loans, gross	869
Other [Member] \| Other/Unrated [Member]
Financing Receivable, Recorded Investment [Line Items]
2020	466
2019	29
Revolving	99
Loans, gross	$ 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

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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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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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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.

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