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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($)	Aug. 10, 2020	Jun. 30, 2021
Commitment And Contingencies [Line Items]
Guarantees, Fair Value Disclosure		$ 0
FINRA [Member]
Commitment And Contingencies [Line Items]
Settlement, penalties agreed to paid	$ 15,000,000
SEC [Member]
Commitment And Contingencies [Line Items]
Settlement, penalties agreed to paid	11,500,000
CFTC [Member]
Commitment And Contingencies [Line Items]
Settlement, penalties agreed to paid	11,500,000
Disgorgement [Member]
Commitment And Contingencies [Line Items]
Settlement, penalties agreed to paid	$ 700,000

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- Definition

Commitment And Contingencies [Line Items]

+ References

No definition available.

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- Definition

Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12201-110248

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- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

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