XML 41 R26.htm IDEA: XBRL DOCUMENT v3.20.2

CONTRACTS AND AGREEMENTS - Brokerage Commission (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Commissions accrued to brokers	$ 595,544	$ 251,098	$ 1,168,244	$ 522,662
Percentage of commissions accrued	0.55%	0.37%	0.55%	0.37%
Rebalancing Investments Transaction [Member]
Commissions accrued to brokers			$ 1,025,730	$ 436,630
Percentage of commissions accrued	87.80%	83.54%	87.80%	83.54%
Creation And Redemption Activity [Member]
Commissions accrued to brokers			$ 142,514	$ 86,032
Percentage of commissions accrued	12.20%	16.46%	12.20%	16.46%

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: