XML 19 R4.htm IDEA: XBRL DOCUMENT
v3.19.1

Schedule of Investments (Parenthetical) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Collateral Amount on Open Futures Contracts | $ 596,555 | $ 1,701,275
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.10%, 1/03/2019 [Member] |  |
Expiration date | 1/03/2019 |
Interest Rate | 2.10% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.10%, 1/10/2019 [Member] |  |
Expiration date | 1/10/2019 |
Interest Rate | 2.10% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.13%, 1/17/2019 [Member] |  |
Expiration date | 1/17/2019 |
Interest Rate | 2.13% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.15%, 1/24/2019 [Member] |  |
Expiration date | 1/24/2019 |
Interest Rate | 2.15% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.18%, 1/31/2019 [Member] |  |
Expiration date | 1/31/2019 |
Interest Rate | 2.18% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.20%, 2/07/2019 [Member] |  |
Expiration date | 2/07/2019 |
Interest Rate | 2.20% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.19%, 2/14/2019 [Member] |  |
Expiration date | 2/14/2019 |
Interest Rate | 2.19% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.20%, 2/21/2019 [Member] |  |
Expiration date | 2/21/2019 |
Interest Rate | 2.20% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.24%, 2/28/2019 [Member] |  |
Expiration date | 2/28/2019 |
Interest Rate | 2.24% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.38%, 3/07/2019 [Member] |  |
Expiration date | 3/07/2019 |
Interest Rate | 2.38% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.28%, 3/14/2019 [Member] |  |
Expiration date | 3/14/2019 |
Interest Rate | 2.28% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.33%, 3/21/2019 [Member] |  |
Expiration date | 3/21/2019 |
Interest Rate | 2.33% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.34%, 3/28/2019 [Member] |  |
Expiration date | 3/28/2019 |
Interest Rate | 2.34% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.37%, 4/04/2019 [Member] |  |
Expiration date | 4/04/2019 |
Interest Rate | 2.37% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.41%, 4/11/2019 [Member] |  |
Expiration date | 4/11/2019 |
Interest Rate | 2.41% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.42%, 4/18/2019 [Member] |  |
Expiration date | 4/18/2019 |
Interest Rate | 2.42% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.43%, 4/25/2019 [Member] |  |
Expiration date | 4/25/2019 |
Interest Rate | 2.43% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.46%, 5/02/2019 [Member] |  |
Expiration date | 5/02/2019 |
Interest Rate | 2.46% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.47%, 5/09/2019 [Member] |  |
Expiration date | 5/09/2019 |
Interest Rate | 2.47% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.48%, 5/16/2019 [Member] |  |
Expiration date | 5/16/2019 |
Interest Rate | 2.48% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.50%, 5/23/2019 [Member] |  |
Expiration date | 5/23/2019 |
Interest Rate | 2.50% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.49%, 5/30/2019 [Member] |  |
Expiration date | 5/30/2019 |
Interest Rate | 2.49% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.51%, 6/06/2019 [Member] |  |
Expiration date | 6/06/2019 |
Interest Rate | 2.51% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.51%, 6/13/2019 [Member] |  |
Expiration date | 6/13/2019 |
Interest Rate | 2.51% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.49%, 6/20/2019 [Member] |  |
Expiration date | 6/20/2019 |
Interest Rate | 2.49% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 2.49%, 6/27/2019 [Member] |  |
Expiration date | 6/27/2019 |
Interest Rate | 2.49% |
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.12%, 1/04/2018 [Member] |  |
Expiration date |  | 1/04/2018
Interest Rate |  | 1.12%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.11%, 1/11/2018 [Member] |  |
Expiration date |  | 1/11/2018
Interest Rate |  | 1.11%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.10%, 1/18/2018 [Member] |  |
Expiration date |  | 1/18/2018
Interest Rate |  | 1.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.12%, 1/25/2018 [Member] |  |
Expiration date |  | 1/25/2018
Interest Rate |  | 1.12%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.12%, 2/01/2018 [Member] |  |
Expiration date |  | 2/01/2018
Interest Rate |  | 1.12%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.13%, 2/08/2018 [Member] |  |
Expiration date |  | 2/08/2018
Interest Rate |  | 1.13%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.12%, 2/15/2018 [Member] |  |
Expiration date |  | 2/15/2018
Interest Rate |  | 1.12%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.10%, 2/22/2018 [Member] |  |
Expiration date |  | 2/22/2018
Interest Rate |  | 1.10%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.09%, 3/01/2018 [Member] |  |
Expiration date |  | 3/01/2018
Interest Rate |  | 1.09%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.14%, 3/08/2018 [Member] |  |
Expiration date |  | 3/08/2018
Interest Rate |  | 1.14%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.14%, 3/15/2018 [Member] |  |
Expiration date |  | 3/15/2018
Interest Rate |  | 1.14%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.16%, 3/22/2018 [Member] |  |
Expiration date |  | 3/22/2018
Interest Rate |  | 1.16%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.17%, 3/29/2018 [Member] |  |
Expiration date |  | 3/29/2018
Interest Rate |  | 1.17%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.19%, 4/05/2018 [Member] |  |
Expiration date |  | 4/05/2018
Interest Rate |  | 1.19%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.22%, 4/12/2018 [Member] |  |
Expiration date |  | 4/12/2018
Interest Rate |  | 1.22%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.23%, 4/19/2018 [Member] |  |
Expiration date |  | 4/19/2018
Interest Rate |  | 1.23%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.25%, 4/26/2018 [Member] |  |
Expiration date |  | 4/26/2018
Interest Rate |  | 1.25%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.27%, 5/03/2018 [Member] |  |
Expiration date |  | 5/03/2018
Interest Rate |  | 1.27%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.32%, 5/10/2018 [Member] |  |
Expiration date |  | 5/10/2018
Interest Rate |  | 1.32%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.37%, 5/17/2018 [Member] |  |
Expiration date |  | 5/17/2018
Interest Rate |  | 1.37%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.43%, 5/24/2018 [Member] |  |
Expiration date |  | 5/24/2018
Interest Rate |  | 1.43%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.43%, 5/31/2018 [Member] |  |
Expiration date |  | 5/31/2018
Interest Rate |  | 1.43%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.45%, 6/07/2018 [member] |  |
Expiration date |  | 6/07/2018
Interest Rate |  | 1.45%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.46%, 6/14/2018 [Member] |  |
Expiration date |  | 6/14/2018
Interest Rate |  | 1.46%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.49%, 6/21/2018 [Member] |  |
Expiration date |  | 6/21/2018
Interest Rate |  | 1.49%
Cash Equivalents [Member] | United States Treasury Obligations [Member] | U.S. Treasury Bills: 1.50%, 6/28/2018 [Member] |  |
Expiration date |  | 6/28/2018
Interest Rate |  | 1.50%

X
- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentCollateralAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The list of dates or date range within which the options may be exercised of the investment subject to option. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13.5(d)) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.4(b)) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010 + Details
Name: | us-gaap_InvestmentOwnedSubjectToOptionExerciseDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | invest_InvestmentAxis=us-gaap_CashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | invest_InvestmentSecuritiesClassAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsTenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsElevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsTwelveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsThirteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsFourteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsFifteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSixteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsEighteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesNinteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsTwentyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesTwentyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesTwentyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesTwentyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesTwentyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesTwentyFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesTwentySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesTwentyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesTwentyNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsThirtyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsThirtyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesThirtyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesThirtyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsThirtyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesThirtyFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesThirtySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsThirtySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsThirtyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesThirtyNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesFortyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesFortyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesFortyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesFortyThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesFortyFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesFortyFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesFortySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesFortySevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesFortyEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesFortyNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesFiftyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesFiftyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | unl_InvestmentSecuritiesSeriesOneAxis=unl_UsTreasuryBillsSeriesFiftyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |