Parent Company - Group Statement of Balance Sheets (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Condensed Balance Sheet Statements, Captions [Line Items]
Investment at fair value	$ 82,778	$ 57,827
Group Inc. [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Loans to and receivables from Nonbank subsidiaries, at fair value	7,242	6,460
Unsecured short-term borrowings, including the current portion of unsecured long-term borrowings, at fair value	1,723	4,751
Unsecured long-term borrowings at fair value	11,145	15,611
Investment at fair value	16,642	16,930
Derivative contracts with subsidiaries included in Trading Assets	843	584
Derivative contracts with subsidiaries included in Trading Liabilities	320	$ 365
2022	30,970
2023	241
2024	193
2025	308
2026-thereafter	$ 704

Derivative contracts with subsidiaries.

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- Definition

Derivative contracts with subsidiaries included in Financial instruments sold, but not yet purchased.

+ References

No definition available.

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- Definition

Loans To And Receivables From Non Bank Subsidiaries at Fair Value

+ References

No definition available.

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- Definition

Unsecured long-term borrowings at fair value

+ References

No definition available.

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- Definition

Amount of unsecured long-term debt maturing after year five following the current fiscal year, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

+ References

No definition available.

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Amount of unsecured long-term debt maturing in year five following the current fiscal year, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

+ References

No definition available.

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Amount of unsecured long-term debt maturing in year four following the current fiscal year, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

+ References

No definition available.

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Amount of unsecured long-term debt maturing in year three following the current fiscal year, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

No definition available.

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Amount of unsecured long-term debt maturing in year two following the current fiscal year, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

No definition available.

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- Definition

Unsecured short-term borrowings, including the current portion of unsecured long-term borrowings, at fair value.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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