Deposits - Types and Sources of the Firm's Deposits (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Deposits [Line Items]
Savings and demand	$ 179,158	$ 118,750
Time	82,076	71,269
Total	261,234	190,019
Consumer Deposits [Member]
Deposits [Line Items]
Savings and demand	64,645	44,973
Time	30,913	15,023
Total	95,558	59,996
Private Bank Deposits [Member]
Deposits [Line Items]
Savings and demand	63,944	53,726
Time	1,608	2,087
Total	65,552	55,813
Brokered Certificates Of Deposit [Member]
Deposits [Line Items]
Time	34,609	39,449
Total	34,609	39,449
Deposit Sweep Programs [Member]
Deposits [Line Items]
Savings and demand	22,987	17,760
Total	22,987	17,760
Transaction Banking [Member]
Deposits [Line Items]
Savings and demand	27,582	2,291
Time	181	235
Total	27,763	2,526
Other Deposits [Member]
Deposits [Line Items]
Time	14,765	14,475
Total	$ 14,765	$ 14,475

Deposits [Line Items]

No definition available.

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- Definition

The amount of savings and demand deposits with no stated maturity.

+ References

No definition available.

+ Details

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- Definition

The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

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- Definition

Amount of time deposit liabilities, including certificates of deposit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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