Fair Value Option - Level 3 Rollforward (Detail) - Other Financial Liabilities [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Beginning Balance	$ (28,136)	$ (25,963)	$ (28,058)	$ (21,036)
Net realized gains / (losses)	(181)	(112)	(388)	(244)
Net unrealized gains/(losses)	819	(354)	822	347
Issuances	(4,856)	(6,974)	(11,797)	(18,633)
Settlements	6,742	6,911	13,325	14,348
Transfers into level 3	(570)	(1,756)	(745)	(2,857)
Transfers out of level 3	1,845	344	2,504	171
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance	(24,337)	(27,904)	(24,337)	(27,904)
Deposits at Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Beginning Balance	(3,908)	(4,217)	(4,221)	(4,023)
Net realized gains / (losses)	(8)	(4)	(23)
Net unrealized gains/(losses)	74	(68)	(28)	(142)
Issuances	(144)	(124)	(341)	(4,054)
Settlements	307	235	904	4,083
Transfers into level 3		(38)	(23)	(69)
Transfers out of level 3	42	66	95	55
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance	(3,637)	(4,150)	(3,637)	(4,150)
Repurchase Agreements at Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Beginning Balance		(10)	(2)	(30)
Net unrealized gains/(losses)				(2)
Settlements		8	2	30
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance		(2)		(2)
Other Secured Financings at Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Beginning Balance	(2,891)	(1,773)	(3,474)	(386)
Net realized gains / (losses)	3	7	(1)	13
Net unrealized gains/(losses)	30	(67)	71	(12)
Issuances	(43)	(10)	(101)	(847)
Settlements	414	79	657	332
Transfers into level 3	(233)	(1,299)	(243)	(2,163)
Transfers out of level 3	80		451
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance	(2,640)	(3,063)	(2,640)	(3,063)
Unsecured Short-Term Borrowings Including Current Portion of Unsecured Long-Term Borrowings at Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Beginning Balance	(11,461)	(6,806)	(7,523)	(5,707)
Net realized gains / (losses)	(112)	(58)	(168)	(109)
Net unrealized gains/(losses)	429	(42)	334	458
Issuances	(3,453)	(4,879)	(8,042)	(7,605)
Settlements	4,846	4,295	6,399	5,571
Transfers into level 3	(200)	(280)	(183)	(234)
Transfers out of level 3	1,282	196	514	52
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance	(8,669)	(7,574)	(8,669)	(7,574)
Unsecured Long-Term Borrowings at Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Beginning Balance	(9,714)	(12,837)	(12,576)	(10,741)
Net realized gains / (losses)	(64)	(64)	(196)	(171)
Net unrealized gains/(losses)	289	(167)	348	225
Issuances	(1,216)	(1,949)	(3,313)	(6,099)
Settlements	1,175	2,294	5,363	4,332
Transfers into level 3	(137)	(139)	(296)	(390)
Transfers out of level 3	441	82	1,444	64
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance	(9,226)	(12,780)	(9,226)	(12,780)
Other Liabilities at Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Beginning Balance	(162)	(320)	(262)	(149)
Net realized gains / (losses)		7		23
Net unrealized gains/(losses)	(3)	(10)	97	(180)
Issuances		(12)		(28)
Transfers into level 3				(1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance	$ (165)	$ (335)	$ (165)	$ (335)

Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]

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- Definition

This element represents total net unrealized gains or losses for the period relating to instruments still held at the reporting date, arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings and other comprehensive income.

+ References

No definition available.

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- Definition

Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

+ 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 (c)(3)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

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- Definition

Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

+ 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 (c)(1)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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