Amendment Flag Current Fiscal Year End Date Document Period End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Document Type Investment Contract Counterparty [Axis] Investment Contract Counterparty [Domain] Summary of Significant Accounting Policies [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Total assets Assets Assets Assets [Abstract] Basis of Accounting Capital units, outstanding (in units) Class 0 Units [Member] Capital Unit, Class A [Member] Capital Units by Class [Axis] Capital unit redemptions [Line Items] Class 2 Units [Member] Capital Unit, Class B [Member] Capital Unit, Class [Domain] Net change in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, end of period Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value Principles of Consolidation Ownership percentage (in hundredths) Equity Method Investment, Ownership Percentage Equity Method Investee Name [Domain] Investment in Graham Alternative Investment Trading LLC Equity Method Investments, Policy [Policy Text Block] Fair Value Fair Value Measurement, Policy [Policy Text Block] Net gain (loss) allocated from investment in Graham Alternative Investment Trading LLC: Incentive allocation Incentive Allocation allocated to the Fund by GAIT Net income (loss) Net income (loss) Income (Loss) Attributable to Parent Consolidated Statements of Operations (Unaudited) [Abstract] Income Taxes [Abstract] Income Taxes Income Tax Disclosure [Text Block] Interest income Interest Income, Operating Net investment loss allocated from investments in Graham Alternative Investment Trading LLC: Investment income: Investment in Graham Alternative Investment Trading LLC, at fair value Total liabilities and members' capital Liabilities and Equity Liabilities: Total liabilities Liabilities Liabilities and members' capital Maximum [Member] Minimum [Member] Cash flows used in financing activities Cash flows provided by operating activities Net cash provided by operating activities Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net gain (loss) allocated from investment in Graham Alternative Investment Trading LLC Net Realized and Unrealized Gain (Loss) on Trading Securities Recent Accounting Pronouncements Advisory fees Noninterest Expense Investment Advisory Fees Expenses: Total expenses Operating Expenses Organization and Business [Abstract] Organization and Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Members' capital, ending balance (in units) Members' capital, beginning balance (in units) Partners' Capital Account, Units Members' capital: Redemptions Partners' Capital Account, Redemptions Capital Accounts [Abstract] Members' capital, ending balance Members' capital, beginning balance Members' capital Redemptions (in units) Partners' Capital Account, Units, Redeemed Capital Accounts Partners' Capital Notes Disclosure [Text Block] Brokerage commissions and fees Proceeds from sale of investments Professional fees and other Range [Axis] Range [Domain] Fees and Related Party Transactions Related Party Transactions Disclosure [Text Block] Fees and Related Party Transactions [Abstract] Schedule of Capital Units [Table] Equity Method Investee, Name [Axis] Schedule Of Equity Method Investments [Table] Schedule of Equity Method Investments [Line Items] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Sponsor fees Statement [Table] Statement [Line Items] Consolidated Statements of Changes in Members' Capital Equity (Unaudited) [Abstract] Consolidated Statements of Cash Flows (Unaudited) [Abstract] Consolidated Statements of Financial Condition (Unaudited) [Abstract] Subsequent Events Subsequent Events [Text Block] Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Line Items] Subsequent Event [Member] Subsequent Event Type [Domain] Subsequent Event Type [Axis] Net realized gain (loss) on investments Trading Securities, Realized Gain (Loss) Net decrease in unrealized appreciation on investments Trading Securities, Change in Unrealized Holding Gain (Loss) Document and Entity Information [Abstract] The cash inflow from unit subscription activity during the reporting period. Proceeds From Subscriptions Subscriptions The cash outflow from unit redemption activity during the reporting period. Payments Of Redemptions Redemptions Investments made in other funds. Investments made in other funds Investments Represents funds which invest in various master trading vehicles "Master Funds". Graham Alternative Investment Trading LLC [Member] Financial Highlights [Abstract] The entire disclosure for entities' financial highlights. Financial Highlights [Text Block] Financial Highlights Total change in each class of partners' capital accounts during the year due to subscriptions. All partners include general, limited and preferred partners. Partners Capital Account Subscriptions Subscriptions The number of units subscribed during the year of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners. Partners Capital Account Subscribed Subscriptions (in units) Operating Performance Calculation Per Unit [Abstract] Operating performance calculation per unit [Abstract] Net Asset Value Per Unit [Abstract] Per unit operating performance [Abstract] This element represents the total value of investments in certain entities that calculate net asset value per share (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements, but may also be used in both the balance sheet and disclosure in the same submission. This item represents alternative investments as of the balance sheet date which may include investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds, and any other investment in which investee management calculates net asset value per share as the primary metric for investment value. Net Asset Value Per Unit Net asset value per unit, ending balance (in dollars per unit) Net asset value per unit, beginning balance (in dollars per units) Income Loss Net [Abstract] Net income (loss): [Abstract] Ratios To Average Members Capital And Total Return [Abstract] Ratios to average members' capital and total return [Abstract] Incentive allocation paid to the manager. Incentive Allocation Allocated To Expenses Incentive Allocation (in hundredths) Calculated net investment loss before incentive allocation as a percentage of average capital. Entities That Calculate Net Asset Value Per Share Net Investment Loss Before Incentive Allocation Net investment loss before Incentive Allocation (in hundredths) Calculated total expenses before incentive allocation as a percentage of average capital. Entities That Calculate Net Asset Value Per Share Total Expenses Before Incentive Allocation Total expenses before Incentive Allocation (in hundredths) Calculated incentive allocation as a percentage of average capital. Incentive Allocation of Net Investment Percentage Incentive Allocation (in hundredths) Calculated return before incentive allocation as a percentage of total. Entities That Calculate Net Asset Value Per Share Total Return Before Incentive Allocation Total return before Incentive Allocation (in hundredths) Investment income (loss) net of operating and interest expense. Income loss Net Net (loss) income (in dollars per unit) Calculated total return after incentive allocation as a percentage of average capital. Entities That Calculate Net Asset Value Per Share Total Return After Incentive Allocation Total return after Incentive Allocation (in hundredths) Calculated incentive allocation as a percentage of average capital. Entities That Calculate Net Asset Value Per Share Incentive Allocation Incentive Allocation (in hundredths) Calculated total expenses after incentive allocation as a percentage of average capital. Entities That Calculate Net Asset Value Per Share Total Expenses After Incentive Allocation Total expenses after Incentive Allocation (in hundredths) Amount of losses realized during the period from certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). Investments Entities That Calculate Net Asset Value Per Share Net Investment Loss Net investment loss (in dollars per unit) Investment income (loss) net of operating and interest expense. Net Gain Loss On Investment Net gain (loss) on investments (in dollars per unit) Calculated net investment loss after incentive allocation as a percentage of average capital. Entities That Calculate Net Asset Value Per Share Net Investment Loss After Incentive Allocation Net investment loss after Incentive Allocation (in hundredths) Amounts expected to be received for redemptions from investments at the end of the reporting period. Redemption receivable Redemption receivable from Graham Alternative Investment Trading LLC Represents amount due to shareholder's for redemptions at the end of the reporting period. Accrued redemptions Investment income (loss) net of operating and interest expense. Net Investment Loss Net investment loss allocated from investment in Graham Alternative Investment Trading LLC Fees paid for services provided by an independent administrator for certain matters pertaining to the administration of the Fund. Administrator's fees Administrator's fees Represents stated value of each capital unit per unit. Capital units, stated value Capital units, value (in dollars per unit) Number of capital units or capital shares issued. Capital Units Issued Capital units, issued (in units) Number of classes of units in different series or portfolio offered by the fund. Number Of Classes Of Units Number of classes of units offered by Fund Description of the holding period applicable to a minimum redemption fee. Minimum Applicable Redemption Fee Holding Period Description Minimum applicable redemption fee - holding period, description Represents period of remittance of redemption proceed. Period of Remittance Redemption Proceeds Period of remittance for redemption proceeds Minimum amount required by the investors to invest in each class of capital units or shares. Minimum Initial Subscription Amount Minimum initial subscription amount The amount of cash paid during the periods for redemptions that occurred during a predefined time period. Fees Paid to the Manager for Redemptions Fees paid to the manager for redemptions Represents minimum notice period for units available for redemption. Minimum Notice Period For Units Redemption Minimum notice period for units redemption Represents minimum subscription for additional units subscribed to members under each class. Minimum Subscription for Additional Units Subscribed Minimum cost for additional units Represents minimum holding that an investor must have before partial redemption. Minimum Holding Post Partial Redemption Minimum holding post partial redemption The fee, expressed as a percentage of net asset value, for the redemption of a class of capital units for specific time period. Redemption Premium Fee Rate Redemption fee (in hundredths) Represents minimum amount for partial redemption request. Minimum Amount for Partial Redemption Request Minimum amount for partial redemption request Partner's capital and redemption policies. Redemption And Conversion Policies Redemption and conversion policies Description of the holding period applicable to a maximum redemption fee. Maximum Applicable Redemption Fee Holding Period Description Maximum applicable redemption fee - holding period, description Represents minimum notice period for units available for subscription. Minimum Notice Period for Units Subscription Minimum notice period for units subscription Amount paid to the advisor for management of the day-to-day business functions of the LLC or LP including the fee rate, basis of calculation, relevant accounting period, whether the fee is paid to an entity other than the managing member or General Partner, or whether the fee is waived. Management fee Advisory fees at annual rate of net asset value of fund (in hundredths) Represents tabular disclosure of operating performance calculation per unit. Operating Performance Calculation Per Unit [Table Text Block] Operating performance calculation per unit Represents tabular disclosure of ratios to average members' capital and total return. Ratios to Average Members Capital and Total Return [Table Text Block] Ratios to average members' capital and total return Disclosure of accounting policy for indemnification. Indemnifications Policy [Policy Text Block] Indemnifications Graham Alternative Investment Ltd. [Abstract] Graham Alternative Investment Ltd. [Abstract] Represents parent entity's interest in net assets, expressed as a percentage. Percentage of Ownership Interest Percentage of ownership interest (in hundredths) Incentive fees which are compensation paid to a trading advisor or to any practitioner who achieves investment results above a specified contractual level. Noninterest Expense Related to Performance Fees, Percentage Percentage of incentive allocation (in hundredths) Sponsor Fees [Abstract] Fees paid to advisors who provide certain management support and administrative oversight services including the organization and sale of stock, investment funds, limited partnerships and mutual funds. Sponsors Fee Sponsor fees at annual rate of net asset value of fund (in hundredths) Administrator's Fee [Abstract] Tabular disclosure of Sponsor Fees at an annual rate, disclosed as a percentage. Schedule of Sponsor Fees [Table Text Block] Sponsor Fees The amount of redemptions of the fund during the period from the beginning of the period to the latest practicable date. Fund Redemptions Fund redemptions The amount of subscriptions to the fund during the period from the beginning of the period to the latest practicable date. Fund Subscriptions Fund subscriptions Number of other investment series owned by the entity during the period. Other Series Owned By Entity Other series owned by the entity Represents period of change in total amount of unrecognized tax expense due to unaware tax positions. Change in Amount of Unrecognized Tax Expense due to Unaware Tax Positions Period Change in amount of unrecognized tax expense due to unaware tax positions, period