Organization and Basis of Presentation	3 Months Ended
Feb. 28, 2018
Accounting Policies [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Organization Jefferies Group LLC is the largest independent U.S-headquartered global full service, integrated securities and investment banking firm. The accompanying Consolidated Financial Statements represent the accounts of Jefferies Group LLC and all our subsidiaries (together “we” or “us”). The subsidiaries of Jefferies Group LLC include Jefferies LLC (“Jefferies”), Jefferies International Limited, Jefferies Hong Kong Limited, Jefferies Financial Services, Inc., Jefferies Funding LLC, Jefferies Leveraged Credit Products, LLC and all other entities in which we have a controlling financial interest or are the primary beneficiary. In November 2017, Jefferies Execution Services, Inc. merged with and into Jefferies, with Jefferies as the surviving entity. Jefferies Group LLC is an indirect wholly owned subsidiary of publicly traded Leucadia National Corporation (“Leucadia”). Leucadia does not guarantee any of our outstanding debt securities. Our 3.875% Convertible Senior Debentures due 2029 (principal amount of $345.0 million) (the “debentures”) were convertible into Leucadia common shares. At November 22, 2017, all of the remaining convertible debentures were called for optional redemption and were redeemed on January 5, 2018 (see Note 12, Long-Term Debt, for further details). Jefferies Group LLC is a Securities and Exchange Commission (“SEC”) reporting company, filing annual, quarterly and periodic financial reports. Richard Handler, our Chief Executive Officer and Chairman, is the Chief Executive Officer of Leucadia, as well as a Director of Leucadia. Brian P. Friedman, our Chairman of the Executive Committee, is Leucadia’s President and a Director of Leucadia. In connection with the acquisition of Jefferies Bache from Prudential on July 1, 2011, we acquired a defined benefits pension plan located in Germany (the “German Pension Plan”) for the benefit of eligible employees of Jefferies Bache in that territory. On December 28, 2017, a Liquidation Insurance Contract was entered into between Jefferies Bache Limited and Generali Lebensversicherung AG (“Generali“) to transfer the defined benefit pension obligations and insurance contracts to Generali, for approximately €6.5 million, which was paid in January 2018 and released us from any and all obligations under the German Pension Plan. This transaction was completed in the first quarter of 2018. In addition, on December 28, 2017, we entered into an agreement with Prudential under which we received $3.25 million as consideration for the release of Prudential by us from their indemnity relating to the German Pension Plan defined benefit pension obligations. We operate in two reportable business segments, Capital Markets and Asset Management. For further information on our reportable business segments, refer to Note 18, Segment Reporting. Basis of Presentation The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) and should be read in conjunction with our consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended November 30, 2017. Certain footnote disclosures included in our Annual Report on Form 10-K for the year ended November 30, 2017 have been condensed or omitted from the consolidated financial statements as they are not required for interim reporting under U.S. GAAP. The Consolidated Financial Statements reflect all adjustments of a normal, recurring nature that are, in the opinion of management, necessary for the fair presentation of the results for the interim period. The results presented in the Consolidated Financial Statements for interim periods are not necessarily indicative of the results for the entire year. We have made a number of estimates and assumptions relating to the reporting of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses during the reporting period to prepare these consolidated financial statements in conformity with U.S. GAAP. The most important of these estimates and assumptions relate to fair value measurements, compensation and benefits, goodwill and intangible assets, the ability to realize certain deferred tax assets and the recognition and measurement of uncertain tax positions. Although these and other estimates and assumptions are based on the best available information, actual results could be materially different from these estimates. Consolidation Our policy is to consolidate all entities that we control by ownership of a majority of the outstanding voting stock. In addition, we consolidate entities that meet the definition of a variable interest entity (“VIE”) for which we are the primary beneficiary. The primary beneficiary is the party who has the power to direct the activities of a VIE that most significantly impact the entity’s economic performance and who has an obligation to absorb losses of the entity or a right to receive benefits from the entity that could potentially be significant to the entity. For consolidated entities that are less than wholly owned, the third-party’s holding of equity interest is presented as Noncontrolling interests in our Consolidated Statements of Financial Condition and Consolidated Statements of Changes in Equity. The portion of net earnings attributable to the noncontrolling interests is presented as Net earnings to noncontrolling interests in our Consolidated Statements of Earnings. In situations in which we have significant influence, but not control, of an entity that does not qualify as a VIE, we apply either the equity method of accounting or fair value accounting pursuant to the fair value option election under U.S. GAAP, with our portion of net earnings or gains and losses recorded in Other revenues or Principal transaction revenues, respectively. We also have formed nonconsolidated investment vehicles with third-party investors that are typically organized as partnerships or limited liability companies and are carried at fair value. We act as general partner or managing member for these investment vehicles and have generally provided the third-party investors with termination or “kick-out” rights. Intercompany accounts and transactions are eliminated in consolidation. Changes to the Consolidated Statements of Operations We have reorganized the presentation of our gains and losses generated from our capital invested in asset management funds managed by us and related parties. This was previously presented as Asset management: Investment income (loss) from investments in managed funds and is now presented within Principal transactions revenues. Changes to the Consolidated Statements of Cash Flows We have made certain changes to the presentation of our Consolidated Statements of Cash Flows in order to net certain Short-term borrowings, primarily related to revolving intraday credit advances. Refer to Note 11, Short-Term Borrowings, for further information. The changes had the impact of reducing Proceeds from short-term borrowings by $9,682.6 million and increasing Payments on short-term borrowings by $9,682.6 million for the three month periods ended February 28, 2017. There was no change to the total Net cash provided by financing activities. We do not believe these changes are material to our Consolidated Statements of Cash Flows.

Organization and Basis of Presentation

Organization

Jefferies Group LLC is the largest independent U.S-headquartered global full service, integrated securities and investment banking firm. The accompanying Consolidated Financial Statements represent the accounts of Jefferies Group LLC and all our subsidiaries (together “we” or “us”). The subsidiaries of Jefferies Group LLC include Jefferies LLC (“Jefferies”), Jefferies International Limited, Jefferies Hong Kong Limited, Jefferies Financial Services, Inc., Jefferies Funding LLC, Jefferies Leveraged Credit Products, LLC and all other entities in which we have a controlling financial interest or are the primary beneficiary. In November 2017, Jefferies Execution Services, Inc. merged with and into Jefferies, with Jefferies as the surviving entity.

Jefferies Group LLC is an indirect wholly owned subsidiary of publicly traded Leucadia National Corporation (“Leucadia”). Leucadia does not guarantee any of our outstanding debt securities. Our 3.875% Convertible Senior Debentures due 2029 (principal amount of $345.0 million) (the “debentures”) were convertible into Leucadia common shares. At November 22, 2017, all of the remaining convertible debentures were called for optional redemption and were redeemed on January 5, 2018 (see Note 12, Long-Term Debt, for further details). Jefferies Group LLC is a Securities and Exchange Commission (“SEC”) reporting company, filing annual, quarterly and periodic financial reports. Richard Handler, our Chief Executive Officer and Chairman, is the Chief Executive Officer of Leucadia, as well as a Director of Leucadia. Brian P. Friedman, our Chairman of the Executive Committee, is Leucadia’s President and a Director of Leucadia.

In connection with the acquisition of Jefferies Bache from Prudential on July 1, 2011, we acquired a defined benefits pension plan located in Germany (the “German Pension Plan”) for the benefit of eligible employees of Jefferies Bache in that territory. On December 28, 2017, a Liquidation Insurance Contract was entered into between Jefferies Bache Limited and Generali Lebensversicherung AG (“Generali“) to transfer the defined benefit pension obligations and insurance contracts to Generali, for approximately €6.5 million, which was paid in January 2018 and released us from any and all obligations under the German Pension Plan. This transaction was completed in the first quarter of 2018. In addition, on December 28, 2017, we entered into an agreement with Prudential under which we received $3.25 million as consideration for the release of Prudential by us from their indemnity relating to the German Pension Plan defined benefit pension obligations.

We operate in two reportable business segments, Capital Markets and Asset Management. For further information on our reportable business segments, refer to Note 18, Segment Reporting.

Basis of Presentation

The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) and should be read in conjunction with our consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended November 30, 2017. Certain footnote disclosures included in our Annual Report on Form 10-K for the year ended November 30, 2017 have been condensed or omitted from the consolidated financial statements as they are not required for interim reporting under U.S. GAAP. The Consolidated Financial Statements reflect all adjustments of a normal, recurring nature that are, in the opinion of management, necessary for the fair presentation of the results for the interim period. The results presented in the Consolidated Financial Statements for interim periods are not necessarily indicative of the results for the entire year.

We have made a number of estimates and assumptions relating to the reporting of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenues and expenses during the reporting period to prepare these consolidated financial statements in conformity with U.S. GAAP. The most important of these estimates and assumptions relate to fair value measurements, compensation and benefits, goodwill and intangible assets, the ability to realize certain deferred tax assets and the recognition and measurement of uncertain tax positions. Although these and other estimates and assumptions are based on the best available information, actual results could be materially different from these estimates.

Consolidation

Our policy is to consolidate all entities that we control by ownership of a majority of the outstanding voting stock. In addition, we consolidate entities that meet the definition of a variable interest entity (“VIE”) for which we are the primary beneficiary. The primary beneficiary is the party who has the power to direct the activities of a VIE that most significantly impact the entity’s economic performance and who has an obligation to absorb losses of the entity or a right to receive benefits from the entity that could potentially be significant to the entity. For consolidated entities that are less than wholly owned, the third-party’s holding of equity interest is presented as Noncontrolling interests in our Consolidated Statements of Financial Condition and Consolidated Statements of Changes in Equity. The portion of net earnings attributable to the noncontrolling interests is presented as Net earnings to noncontrolling interests in our Consolidated Statements of Earnings.

In situations in which we have significant influence, but not control, of an entity that does not qualify as a VIE, we apply either the equity method of accounting or fair value accounting pursuant to the fair value option election under U.S. GAAP, with our portion of net earnings or gains and losses recorded in Other revenues or Principal transaction revenues, respectively. We also have formed nonconsolidated investment vehicles with third-party investors that are typically organized as partnerships or limited liability companies and are carried at fair value. We act as general partner or managing member for these investment vehicles and have generally provided the third-party investors with termination or “kick-out” rights.

Intercompany accounts and transactions are eliminated in consolidation.

Changes to the Consolidated Statements of Operations

We have reorganized the presentation of our gains and losses generated from our capital invested in asset management funds managed by us and related parties. This was previously presented as Asset management: Investment income (loss) from investments in managed funds and is now presented within Principal transactions revenues.

Changes to the Consolidated Statements of Cash Flows

We have made certain changes to the presentation of our Consolidated Statements of Cash Flows in order to net certain Short-term borrowings, primarily related to revolving intraday credit advances. Refer to Note 11, Short-Term Borrowings, for further information. The changes had the impact of reducing Proceeds from short-term borrowings by $9,682.6 million and increasing Payments on short-term borrowings by $9,682.6 million for the three month periods ended February 28, 2017. There was no change to the total Net cash provided by financing activities. We do not believe these changes are material to our Consolidated Statements of Cash Flows.