Fair Value Option - Level 3 Rollforward (Detail) - Other Financial Liabilities [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 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	$ (28,058)	$ (21,036)
Net realized gains / (losses)	(401)	(317)
Net unrealized gains/(losses)	825	(1,301)
Issuances	(12,632)	(18,123)
Settlements	14,930	15,373
Transfers into level 3	(736)	(3,575)
Transfers out of level 3	2,505	921
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance	(23,567)	(28,058)
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	(4,221)	(4,023)
Net realized gains / (losses)	(28)	1
Net unrealized gains/(losses)	(110)	(319)
Issuances	(473)	(4,049)
Settlements	1,203	4,168
Transfers into level 3	(70)	(57)
Transfers out of level 3	86	58
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance	(3,613)	(4,221)
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	(2)	(30)
Net unrealized gains/(losses)	1	(2)
Settlements	1	30
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance		(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	(3,474)	(386)
Net realized gains / (losses)	(27)	13
Net unrealized gains/(losses)	63	(142)
Issuances	(145)	(1,195)
Settlements	779	368
Transfers into level 3	(135)	(2,132)
Transfers out of level 3	373
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance	(2,566)	(3,474)
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	(7,523)	(5,707)
Net realized gains / (losses)	(134)	(132)
Net unrealized gains/(losses)	374	(215)
Issuances	(7,878)	(6,634)
Settlements	7,188	5,029
Transfers into level 3	(163)	(629)
Transfers out of level 3	307	765
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance	(7,829)	(7,523)
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	(12,576)	(10,741)
Net realized gains / (losses)	(212)	(229)
Net unrealized gains/(losses)	381	(510)
Issuances	(4,136)	(6,215)
Settlements	5,759	5,778
Transfers into level 3	(368)	(757)
Transfers out of level 3	1,739	98
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance	(9,413)	(12,576)
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	(262)	(149)
Net realized gains / (losses)		30
Net unrealized gains/(losses)	116	(113)
Issuances		(30)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance	$ (146)	$ (262)

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

No definition available.

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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.

+ Details

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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.

+ References

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-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.

+ References

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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