XML 41 R26.htm IDEA: XBRL DOCUMENT
v3.21.2

CONTRACTS AND AGREEMENTS - Brokerage Commission (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Commissions accrued to brokers | $ 178,268 | $ 595,544 | $ 436,130 | $ 1,168,244
Percentage of commissions accrued | 0.29% | 0.55% | 0.29% | 0.55%
Rebalancing Investments Transaction [Member] |  |  |  |
Commissions accrued to brokers |  |  | $ 395,670 | $ 1,025,730
Percentage of commissions accrued | 90.72% | 87.80% | 90.72% | 87.80%
Creation And Redemption Activity [Member] |  |  |  |
Commissions accrued to brokers |  |  | $ 40,460 | $ 142,514
Percentage of commissions accrued | 9.28% | 12.20% | 9.28% | 12.20%

X
- Definition Percentage of Average Daily Net Assets + References No definition available. + Details
Name: | ung_PercentageOfAverageDailyNetAssets
Namespace Prefix: | ung_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees. + References No definition available. + Details
Name: | us-gaap_FloorBrokerageExchangeAndClearanceFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=ung_RebalancingInvestmentsTransactionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=ung_TradesNecessitatedByCreationAndRedemptionActivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |