United States Natural Gas Fund (UNG) 10-K13 Mar 202019 FY Annual reportFinancial data

Company Profile

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Dec. 31, 2019	Mar. 11, 2020	Jun. 30, 2019
Document And Entity Information
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Registrant Name	United States Natural Gas Fund, LP
Entity Central Index Key	0001376227
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 325,889,455
Trading Symbol	UNG
Entity Common Stock, Shares Outstanding		28,184,588
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false

Statements of Financial Conditi

Statements of Financial Condition - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents (at cost $375,588,135 and $259,491,732, respectively)	$ 375,588,135	$ 259,491,732
Equity in trading accounts:
Cash and cash equivalents (at cost $83,410,316 and $100,299,442, respectively)	83,410,316	100,299,442
Unrealized gain (loss) on open commodity futures contracts	(20,768,690)	(67,021,257)
Receivable for shares sold	6,765,424
Dividends receivable	140,270	78,143
Interest receivable	5,227	9,670
Prepaid insurance	7,569	8,204
Prepaid registration fees	467,490	75,014
ETF transaction fees receivable	1,000	1,000
Total assets	445,616,741	292,941,948
Liabilities and Partners' Capital
Payable for shares redeemed	0	43,833,276
General Partner management fees payable (Note 3)	207,145	180,632
Professional fees payable	786,718	863,937
Brokerage commissions payable	36,300	36,300
Directors' fees payable	10,691	8,602
License fees payable	2,633	4,678
Total liabilities	1,043,487	44,927,425
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital
General Partner	0
Limited Partners	444,573,254	248,014,523
Total Partners' Capital	444,573,254	248,014,523
Total liabilities and partners' capital	$ 445,616,741	$ 292,941,948
Limited Partners' shares outstanding	26,284,588	10,184,588
Net asset value per share	$ 16.91	$ 24.35
Market value per share	$ 16.86	$ 24.71

Schedule of Investments

Schedule of Investments - USD ($)	Dec. 31, 2019		Dec. 31, 2018
Value/ Unrealized Gain (Loss) on Open Commodity Contracts	$ (20,768,690)		$ (67,021,257)
Open Futures Contracts - Long [Member] \| United States Contracts
Notional Amount	$ 465,354,590	[1]	$ 315,010,257	[2]
Number of Contracts	20,310	[1]	12,935	[2]
Value/ Unrealized Gain (Loss) on Open Commodity Contracts	$ (20,768,690)	[1]	$ (67,021,257)	[2]
% of Partners' Capital	(4.67%)	[1]	(27.02%)	[2]
Open Futures Contracts - Long [Member] \| United States Contracts \| NYMEX Natural Gas Futures NG February 2019 contracts, expiring January 2019 [Member]
Notional Amount			$ 259,275,882
Number of Contracts			6,935
Value/ Unrealized Gain (Loss) on Open Commodity Contracts			$ (55,386,882)
% of Partners' Capital			(22.33%)
Open Futures Contracts - Long [Member] \| United States Contracts \| ICE Natural Gas Futures LD1 H February 2019 contracts, expiring February 2019 [Member]
Notional Amount			$ 55,734,375
Number of Contracts			6,000
Value/ Unrealized Gain (Loss) on Open Commodity Contracts			$ (11,634,375)
% of Partners' Capital			(4.69%)
Cash Equivalents [Member]
Market Value	$ 418,959,876		$ 272,193,228
% of Partners' Capital	94.24%		109.75%
Cash Equivalents [Member] \| United States Treasury Obligations [Member]
Market Value	$ 258,959,876		$ 238,493,228
% of Partners' Capital	58.25%		96.16%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.10%, 1/03/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,998,847
% of Partners' Capital			4.03%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.10%, 1/10/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,994,800
% of Partners' Capital			4.03%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.13%, 1/17/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,990,622
% of Partners' Capital			4.03%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.15%, 1/24/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,986,423
% of Partners' Capital			4.03%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.18%, 1/31/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,982,042
% of Partners' Capital			4.02%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.20%, 2/07/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,977,646
% of Partners' Capital			4.02%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.20%, 2/21/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,969,117
% of Partners' Capital			4.02%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.38%, 3/07/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,957,479
% of Partners' Capital			4.01%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.28%, 3/14/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,954,900
% of Partners' Capital			4.01%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.33%, 3/21/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,949,528
% of Partners' Capital			4.01%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.34%, 3/28/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,944,817
% of Partners' Capital			4.01%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.37%, 4/04/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,939,421
% of Partners' Capital			4.01%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.41%, 4/11/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,933,750
% of Partners' Capital			4.01%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.42%, 4/18/2019 [Member]
Principal Amount			$ 5,000,000
Market Value			$ 4,964,408
% of Partners' Capital			2.00%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.43%, 4/25/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,924,000
% of Partners' Capital			4.00%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.47%, 5/09/2019 [Member]
Principal Amount			$ 15,000,000
Market Value			$ 14,870,133
% of Partners' Capital			6.00%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.48%, 5/16/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,908,125
% of Partners' Capital			3.99%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.50%, 5/23/2019 [Member]
Principal Amount			$ 20,000,000
Market Value			$ 19,805,539
% of Partners' Capital			7.99%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.49%, 5/30/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,898,287
% of Partners' Capital			3.99%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.51%, 6/06/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,892,750
% of Partners' Capital			3.99%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.51%, 6/13/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,887,711
% of Partners' Capital			3.99%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.49%, 6/20/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,883,833
% of Partners' Capital			3.99%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.49%, 6/27/2019 [Member]
Principal Amount			$ 10,000,000
Market Value			$ 9,879,050
% of Partners' Capital			3.98%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.05%, 1/02/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,999,438
% of Partners' Capital	2.25%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.03%, 1/09/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,995,533
% of Partners' Capital	2.25%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.01%, 1/16/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,991,729
% of Partners' Capital	2.25%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.04%, 1/23/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,987,674
% of Partners' Capital	2.25%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 2.02%, 1/30/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,983,905
% of Partners' Capital	2.25%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.90%, 2/06/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,981,225
% of Partners' Capital	2.25%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.87%, 2/13/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,977,843
% of Partners' Capital	2.24%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.85%, 2/20/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,974,514
% of Partners' Capital	2.24%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.85%, 2/27/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,971,025
% of Partners' Capital	2.24%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.83%, 3/05/2020 [Member]
Principal Amount	$ 20,000,000
Market Value	$ 19,935,413
% of Partners' Capital	4.48%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.84%, 3/19/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,960,567
% of Partners' Capital	2.24%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.88%, 3/26/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,956,083
% of Partners' Capital	2.24%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.70%, 4/02/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,956,811
% of Partners' Capital	2.24%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.64%, 4/09/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,955,175
% of Partners' Capital	2.24%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.60%, 4/16/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,953,183
% of Partners' Capital	2.24%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.60%, 4/23/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,950,092
% of Partners' Capital	2.24%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.59%, 4/30/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,947,500
% of Partners' Capital	2.24%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.54%, 5/07/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,946,201
% of Partners' Capital	2.24%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.55%, 5/14/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,942,678
% of Partners' Capital	2.24%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.55%, 5/21/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,939,879
% of Partners' Capital	2.24%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.58%, 5/28/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,935,456
% of Partners' Capital	2.23%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.53%, 6/04/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,934,556
% of Partners' Capital	2.23%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.53%, 6/11/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,931,488
% of Partners' Capital	2.23%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.54%, 6/18/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,928,175
% of Partners' Capital	2.23%
Cash Equivalents [Member] \| United States Treasury Obligations [Member] \| U.S. Treasury Bills, 1.57%, 6/25/2020 [Member]
Principal Amount	$ 10,000,000
Market Value	$ 9,923,733
% of Partners' Capital	2.23%
Cash Equivalents [Member] \| United States Contracts \| Money Market Funds [Member]
Market Value	$ 160,000,000		$ 33,700,000
% of Partners' Capital	35.99%		13.59%
Cash Equivalents [Member] \| United States Contracts \| Money Market Funds [Member] \| Fidelity Investments Money Market Funds Government Portfolio [Member]
Principal Amount	$ 115,000,000		$ 2,500,000
Market Value	$ 115,000,000		$ 2,500,000
% of Partners' Capital	25.87%		1.01%
Cash Equivalents [Member] \| United States Contracts \| Money Market Funds [Member] \| Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member]
Principal Amount	$ 25,000,000		$ 31,200,000
Market Value	$ 25,000,000		$ 31,200,000
% of Partners' Capital	5.62%		12.58%
Cash Equivalents [Member] \| United States Contracts \| Money Market Funds [Member] \| Morgan Stanley Institutional Liquidity Funds - Government Portfolio [Member]
Principal Amount	$ 20,000,000
Market Value	$ 20,000,000
% of Partners' Capital	4.50%

[1]	Collateral amounted to $83,410,316 on open futures contracts.
[2]	Collateral amounted to $100,299,442 on open futures contracts.

Schedule of Investments (Parent

Schedule of Investments (Parenthetical) - USD ($)	12 Months Ended
Schedule of Investments (Parenthetical) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Collateral Amount On Open Futures Contracts	$ 83,410,316	$ 100,299,442
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.10%, 1/03/2019 [Member]
Interest rate		2.10%
Expiration date		1/03/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.10%, 1/10/2019 [Member]
Interest rate		2.10%
Expiration date		1/10/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.13%, 1/17/2019 [Member]
Interest rate		2.13%
Expiration date		1/17/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.15%, 1/24/2019 [Member]
Interest rate		2.15%
Expiration date		1/24/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.18%, 1/31/2019 [Member]
Interest rate		2.18%
Expiration date		1/31/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.20%, 2/07/2019 [Member]
Interest rate		2.20%
Expiration date		2/07/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.20%, 2/21/2019 [Member]
Interest rate		2.20%
Expiration date		2/21/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.38%, 3/07/2019 [Member]
Interest rate		2.38%
Expiration date		3/07/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.28%, 3/14/2019 [Member]
Interest rate		2.28%
Expiration date		3/14/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.33%, 3/21/2019 [Member]
Interest rate		2.33%
Expiration date		3/21/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.34%, 3/28/2019 [Member]
Interest rate		2.34%
Expiration date		3/28/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.37%, 4/04/2019 [Member]
Interest rate		2.37%
Expiration date		4/04/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.41%, 4/11/2019 [Member]
Interest rate		2.41%
Expiration date		4/11/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.42%, 4/18/2019 [Member]
Interest rate		2.42%
Expiration date		4/18/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.43%, 4/25/2019 [Member]
Interest rate		2.43%
Expiration date		4/25/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.47%, 5/09/2019 [Member]
Interest rate		2.47%
Expiration date		5/09/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.48%, 5/16/2019 [Member]
Interest rate		2.48%
Expiration date		5/16/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.50%, 5/23/2019 [Member]
Interest rate		2.50%
Expiration date		5/23/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.49%, 5/30/2019 [Member]
Interest rate		2.49%
Expiration date		5/30/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.51%, 6/06/2019 [Member]
Interest rate		2.51%
Expiration date		6/06/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.51%, 6/13/2019 [Member]
Interest rate		2.51%
Expiration date		6/13/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.49%, 6/20/2019 [Member]
Interest rate		2.49%
Expiration date		6/20/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.49%, 6/27/2019 [Member]
Interest rate		2.49%
Expiration date		6/27/2019
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.05%, 1/02/2020 [Member]
Interest rate	2.05%
Expiration date	1/02/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.03%, 1/09/2020 [Member]
Interest rate	2.03%
Expiration date	1/09/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.01%, 1/16/2020 [Member]
Interest rate	2.01%
Expiration date	1/16/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.04%, 1/23/2020 [Member]
Interest rate	2.04%
Expiration date	1/23/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 2.02%, 1/30/2020 [Member]
Interest rate	2.02%
Expiration date	1/30/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.90%, 2/06/2020 [Member]
Interest rate	1.90%
Expiration date	2/06/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.87%, 2/13/2020 [Member]
Interest rate	1.87%
Expiration date	2/13/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.85%, 2/20/2020 [Member]
Interest rate	1.85%
Expiration date	2/20/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.85%, 2/27/2020 [Member]
Interest rate	1.85%
Expiration date	2/27/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.83%, 3/05/2020 [Member]
Interest rate	1.83%
Expiration date	3/05/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.84%, 3/19/2020 [Member]
Interest rate	1.84%
Expiration date	3/19/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.88%, 3/26/2020 [Member]
Interest rate	1.88%
Expiration date	3/26/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.70%, 4/02/2020 [Member]
Interest rate	1.70%
Expiration date	4/02/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.64%, 4/09/2020 [Member]
Interest rate	1.64%
Expiration date	4/09/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.60%, 4/16/2020 [Member]
Interest rate	1.60%
Expiration date	4/16/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.60%, 4/23/2020 [Member]
Interest rate	1.60%
Expiration date	4/23/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.59%, 4/30/2020 [Member]
Interest rate	1.59%
Expiration date	4/30/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.54%, 5/07/2020 [Member]
Interest rate	1.54%
Expiration date	5/07/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.55%, 5/14/2020 [Member]
Interest rate	1.55%
Expiration date	5/14/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.55%, 5/21/2020 [Member]
Interest rate	1.55%
Expiration date	5/21/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.58%, 5/28/2020 [Member]
Interest rate	1.58%
Expiration date	5/28/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.53%, 6/04/2020 [Member]
Interest rate	1.53%
Expiration date	6/04/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.53%, 6/11/2020 [Member]
Interest rate	1.53%
Expiration date	6/11/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.54%, 6/18/2020 [Member]
Interest rate	1.54%
Expiration date	6/18/2020
United States Treasury Obligations [Member] \| Cash Equivalents [Member] \| U.S. Treasury Bills, 1.57%, 6/25/2020 [Member]
Interest rate	1.57%
Expiration date	6/25/2020

Statements of Operations

Statements of Operations - USD ($)		12 Months Ended
Statements of Operations - USD ($)		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed futures contracts		$ (126,561,127)	$ 230,893,690	$ (209,701,928)
Change in unrealized gain (loss) on open futures contracts		46,252,567	(122,742,937)	18,286,173
Realized gain (loss) on short-term investments		93	(15,781)	(1,172)
Dividend income		582,039	569,787	148,745
Interest income	[1]	6,027,693	5,960,666	3,982,312
ETF transaction fees		120,000	194,000	277,000
Total income (loss)		(73,578,735)	114,859,425	(187,008,870)
Expenses
General Partner management fees (Note 3)		1,820,281	2,259,093	2,972,340
Professional fees		802,399	928,798	1,390,036
Brokerage commissions		1,155,153	1,424,713	1,728,440
Directors' fees and insurance		70,739	69,624	64,982
License fees		45,507	56,477	74,309
Registration fees		144,440	83,258	204,998
Total expenses		4,038,519	4,821,963	6,435,105
Net income (loss)		$ (77,617,254)	$ 110,037,462	$ (193,443,975)
Net income (loss) per limited partnership share		$ (7.44)	$ 1.01	$ (13.84)	[2]
Net income (loss) per weighted average limited partnership share		$ (5.39)	$ 6.73	$ (10.54)	[2]
Weighted average limited partnership shares outstanding		14,401,574	16,359,928	18,356,071	[2]

[1]	Interest income does not exceed paid in kind of 5%.
[2]	On January 4, 2018, there was a 1for4 reverse share split. The Statement of Operations have been adjusted for the period shown to reflect the 1for4 reverse share split on a retroactive basis.

Statements of Changes in Partne

Statements of Changes in Partners' Capital - USD ($)		General Partner [Member]	Limited Partners [Member]	Total
Balances at Dec. 31, 2016		$ 0	$ 537,810,802	$ 537,810,802
Addition of partnership shares		0	1,781,669,130	1,781,669,130
Redemption of partnership shares		0	(1,473,944,224)	(1,473,944,224)
Net income (loss)		0	(193,443,975)	(193,443,975)
Balances at Dec. 31, 2017		0	652,091,733	$ 652,091,733
Net asset value, beginning of period at Dec. 31, 2016	[1]			$ 37.18
Net asset value, end of period at Dec. 31, 2017	[1]			$ 23.34
Addition of partnership shares		0	1,744,841,011	$ 1,744,841,011
Redemption of partnership shares		0	(2,258,955,683)	(2,258,955,683)
Net income (loss)		0	110,037,462	110,037,462
Balances at Dec. 31, 2018		0	248,014,523	$ 248,014,523
Net asset value, end of period at Dec. 31, 2018				$ 24.35
Addition of partnership shares		0	921,642,412	$ 921,642,412
Redemption of partnership shares		0	(647,466,427)	(647,466,427)
Net income (loss)		0	(77,617,254)	(77,617,254)
Balances at Dec. 31, 2019		$ 0	$ 444,573,254	$ 444,573,254
Net asset value, end of period at Dec. 31, 2019				$ 16.91

[1]	On January 4, 2018, there was a 1for4 reverse share split. The Statement of Changes in Partners’ Capital have been adjusted for the period shown to reflect the 1for4 reverse share split on a retroactive basis.

Statements of Changes in Part_2

Statements of Changes in Partners' Capital (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statements of Changes in Partners' Capital
Addition of partnership units	44,600,000	67,200,000	66,825,000
Redemption of partnership units	28,500,000	84,957,031	53,350,000

Statements of Cash Flows

Statements of Cash Flows - USD ($)	12 Months Ended
Statements of Cash Flows - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities:
Net income (loss)	$ (77,617,254)	$ 110,037,462	$ (193,443,975)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Unrealized (gain) loss on open futures contracts	(46,252,567)	122,742,937	(18,286,173)
(Increase) decrease in dividends receivable	(62,127)	(61,099)	(2,090)
(Increase) decrease in interest receivable	4,443	1,903	(11,573)
(Increase) decrease in prepaid insurance	635	(3,646)	(79)
(Increase) decrease in prepaid registration fees	(392,476)	83,258	29,526
(Increase) decrease in ETF transaction fees receivable		1,000
Increase (decrease) in payable due to Broker			(44,770,339)
Increase (decrease) in General Partner management fees payable	26,513	(131,834)	9,112
Increase (decrease) in professional fees payable	(77,219)	(28,822)	455,541
Increase (decrease) in brokerage commissions payable		(36,500)	(12,400)
Increase (decrease) in directors' fees payable	2,089	(4,301)	3,007
Increase (decrease) in license fees payable	(2,045)	(8,116)	(7,138)
Net cash provided by (used in) operating activities	(124,370,008)	232,592,242	(256,036,581)
Cash Flows from Financing Activities:
Addition of partnership shares	914,876,988	1,744,841,011	1,786,316,120
Redemption of partnership shares	(691,299,703)	(2,269,580,373)	(1,446,127,327)
Net cash provided by (used in) financing activities	223,577,285	(524,739,362)	340,188,793
Net Increase (Decrease) in Cash and Cash Equivalents	99,207,277	(292,147,120)	84,152,212
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of year	359,791,174	651,938,294	567,786,082
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of year	$ 458,998,451	$ 359,791,174	$ 651,938,294

Statements of Cash Flows (Paren

Statements of Cash Flows (Parenthetical) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of Cash and Cash Equivalents:
Cash and Cash Equivalents, at Carrying Value	$ 375,588,135	$ 259,491,732	$ 550,936,887
Equity in Trading Accounts:
Cash and Cash Equivalents	83,410,316	100,299,442	101,001,407
Total Cash, Cash Equivalents and Equity in Trading Accounts	$ 458,998,451	$ 359,791,174	$ 651,938,294

ORGANIZATION AND BUSINESS

ORGANIZATION AND BUSINESS	12 Months Ended
ORGANIZATION AND BUSINESS	Dec. 31, 2019
ORGANIZATION AND BUSINESS
ORGANIZATION AND BUSINESS	NOTE 1 — ORGANIZATION AND BUSINESS The United States Natural Gas Fund, LP (“UNG”) was organized as a limited partnership under the laws of the state of Delaware on September 11, 2006. UNG is a commodity pool that issues limited partnership shares (“shares”) that may be purchased and sold on the NYSE Arca, Inc. (the “NYSE Arca”). Prior to November 25, 2008, UNG’s shares traded on the American Stock Exchange (the “AMEX”). UNG will continue in perpetuity, unless terminated sooner upon the occurrence of one or more events as described in its Fifth Amended and Restated Agreement of Limited Partnership dated as of December 15, 2017 (the “LP Agreement”). The investment objective of UNG is for the daily changes in percentage terms of its shares’ per share net asset value (“NAV”) to reflect the daily changes in percentage terms of the price of natural gas delivered at the Henry Hub, Louisiana as measured by the daily changes in the price of the futures contract on natural gas traded on the New York Mercantile Exchange (the “NYMEX”) that is the near month contract to expire, except when the near month contract is within two weeks of expiration, in which case it will be measured by the futures contract that is the next month contract to expire (the “Benchmark Futures Contract”), plus interest earned on UNG’s collateral holdings, less UNG’s expenses. UNG’s investment objective is not for its NAV or market price of shares to equal, in dollar terms, the spot price of natural gas or any particular futures contract based on natural gas, nor is UNG’s investment objective for the percentage change in its NAV to reflect the percentage change of the price of any particular futures contract as measured over a time period greater than one day . United States Commodity Funds LLC (“USCF”), the general partner of UNG, believes that it is not practical to manage the portfolio to achieve such an investment goal when investing in Natural Gas Futures Contracts (as defined below) and Other Natural Gas-Related Investments (as defined below). The net assets of UNG consist primarily of investments in futures contracts for natural gas that are traded on the NYMEX, ICE Futures Exchange (“ICE Futures”) or other U.S. and foreign exchanges (collectively, “Natural Gas Futures Contracts”) and, to a lesser extent, in order to comply with regulatory requirements or in view of market conditions, other natural gas-related investments such as cash-settled options on natural gas Futures Contracts, forward contracts for natural gas, cleared swap contracts, and non-exchange traded over-the-counter (“OTC”) transactions that are based on the price of natural gas, crude oil and other petroleum-based fuels, as well as futures contracts for crude oil, diesel-heating oil, gasoline and other petroleum-based fuels and indices based on the foregoing (collectively, “Other Natural Gas-Related Investments”). Market conditions that USCF currently anticipates could cause UNG to invest in Other Natural Gas-Related Investments including those allowing UNG to obtain greater liquidity or to execute transactions with more favorable pricing. For convenience and unless otherwise specified, Natural Gas Futures Contracts and Other Natural Gas-Related Investments collectively are referred to as “Natural Gas Interests” in this annual report on Form 10‑K. As of December 31, 2019, UNG held 20,310 NG Futures February 2020 Contracts traded on the NYMEX and did not hold any Natural Gas Futures Contracts traded on the ICE Futures US. UNG commenced investment operations on April 18, 2007 and has a fiscal year ending on December 31. USCF is responsible for the management of UNG. USCF is a member of the National Futures Association (the “NFA”) and became registered as a commodity pool operator with the Commodity Futures Trading Commission (the “CFTC”) effective December 1, 2005 and a swaps firm on August 8, 2013. USCF is also the general partner of the United States Oil Fund, LP (“USO”), the United States 12 Month Oil Fund, LP (“USL”) and the United States Gasoline Fund, LP (“UGA”), which listed their limited partnership shares on the AMEX under the ticker symbols “USO” on April 10, 2006, “USL” on December 6, 2007 and “UGA” on February 26, 2008, respectively. As a result of the acquisition of the AMEX by NYSE Euronext, each of USO’s, USL’s and UGA’s shares commenced trading on the NYSE Arca on November 25, 2008. USCF is also the general partner of the United States 12 Month Natural Gas Fund, LP (“UNL”) and the United States Brent Oil Fund, LP (“BNO”), which listed their limited partnership shares on the NYSE Arca under the ticker symbols “UNL” on November 18, 2009 and “BNO” on June 2, 2010, respectively. USCF previously served as the general partner for the United States Short Oil Fund, LP (“DNO”) and the United States Diesel-Heating Oil Fund, LP (“UHN”), both of which were liquidated in 2018. USCF is also the sponsor of the United States Commodity Index Fund (“USCI”), the United States Copper Index Fund (“CPER”) and the USCF Crescent Crypto Index Fund (“XBET”), each a series of the United States Commodity Index Funds Trust (“USCIFT”). USCF previously served as the general partner for the United States Agricultural Index Fund (“USAG”) a series of USCIFT which was liquidated in 2018. XBET is currently in registration and has not commenced operations. USCI and CPER listed their shares on the NYSE Arca under the ticker symbols “USCI” on August 10, 2010 and “CPER” on November 15, 2011, respectively. In addition, USCF is the sponsor of the USCF Funds Trust, a Delaware statutory trust, and each of its series, the United States 3x Oil Fund (“USOU”) and the United States 3x Short Oil Fund (“USOD”), which listed their shares on the NYSE Arca on July 20, 2017 under the ticker symbols “USOU” and “USOD”, respectively. Each of USOU and USOD liquidated all of its assets and distributed cash pro rata to all remaining shareholders in December 2019. USO, UNG, UGA, UNL, USL, BNO, USCI and CPER are referred to collectively herein as the “Related Public Funds.” UNG issues shares to certain authorized purchasers (“Authorized Participants”) by offering baskets consisting of 100,000 shares (“Creation Baskets”) through ALPS Distributors, Inc., as the marketing agent (the “Marketing Agent”). The purchase price for a Creation Basket is based upon the NAV of a share calculated shortly after the close of the core trading session on the NYSE Arca on the day the order to create the basket is properly received. Authorized Participants pay UNG a $1,000 transaction fee for each order placed to create one or more Creation Baskets or to redeem one or more baskets (“Redemption Baskets”), consisting of 100,000 shares. Shares may be purchased or sold on a nationally recognized securities exchange in smaller increments than a Creation Basket or Redemption Basket. Shares purchased or sold on a nationally recognized securities exchange are not purchased or sold at the per share NAV of UNG but rather at market prices quoted on such exchange. In April 2007, UNG initially registered 30,000,000 shares on Form S‑1 with the U.S. Securities and Exchange Commission (the “SEC”). On April 18, 2007, UNG listed its shares on the AMEX under the ticker symbol “UNG” and switched to trading on the NYSE Arca under the same ticker symbol on November 25, 2008. On that day, UNG established its initial per share NAV by setting the price at $50.00 and issued 200,000 shares in exchange for $10,001,000. UNG also commenced investment operations on April 18, 2007, by purchasing Natural Gas Futures Contracts traded on the NYMEX based on natural gas. As of December 31, 2019, UNG had registered a total of 2,280,000,000 shares. On February 21, 2012, after the close of trading on the NYSE Arca, UNG effected a 1‑for‑4 reverse share split and post-split shares of UNG began trading on February 22, 2012. As a result of the reverse share split, every four pre-split shares of UNG were automatically exchanged for one post-split share. Immediately prior to the reverse share split, there were 174,297,828 shares of UNG issued and outstanding, representing a per share NAV of $5.51. Immediately after the reverse share split, the number of issued and outstanding shares of UNG decreased to 43,574,457, not accounting for fractional shares, and the per share NAV increased to $22.04. In connection with the reverse share split, the CUSIP number for UNG’s shares changed to 912318201. UNG’s ticker symbol, “UNG,” did not change. On January 4, 2018, after the close of trading on the NYSE Arca, UNG effected a 1-for-4 reverse share split and post-split shares of UNG began trading on January 5, 2018. As a result of the reverse share split, every four pre-split shares of UNG were automatically exchanged for one post-split share. Immediately prior to the reverse split, there were 97,466,476 shares of UNG issued and outstanding, representing a per share NAV of $5.69. Immediately after the reverse share split, the number of issued and outstanding shares of UNG decreased to 24,366,619, not accounting for fractional shares, and the per share NAV increased to $22.76. In connection with the reverse share split, the CUSIP number for UNG’s shares changed to 912318300. UNG’s ticker symbol, “UNG,” did not change.

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Dec. 31, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	NOTE 2 — SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP") as detailed in the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification. UNG is an investment company and follows the accounting and reporting guidance in FASB Topic 946. Revenue Recognition Commodity futures contracts, forward contracts, physical commodities and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the statements of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the financial statements. Changes in the unrealized gains or losses between periods are reflected in the statements of operations. UNG earns income on funds held at the custodian or a futures commission merchant (“FCM”) at prevailing market rates earned on such investments. Brokerage Commissions Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis. Income Taxes UNG is not subject to federal income taxes; each partner reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return. In accordance with U.S. GAAP, UNG is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. UNG files an income tax return in the U.S. federal jurisdiction and may file income tax returns in various U.S. states. UNG is not subject to income tax return examinations by major taxing authorities for years before 2016. The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in UNG recording a tax liability that reduces net assets. However, UNG’s conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analysis of and changes to tax laws, regulations and interpretations thereof. UNG recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the year ended December 31, 2019. Creations and Redemptions Authorized Participants may purchase Creation Baskets or redeem Redemption Baskets only in blocks of 100,000 shares at a price equal to the NAV of the shares calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed. UNG receives or pays the proceeds from shares sold or redeemed within two business days after the trade date of the purchase or redemption. The amounts due from Authorized Participants are reflected in UNG’s statements of financial condition as receivable for shares sold and amounts payable to Authorized Participants upon redemption are reflected as payable for shares redeemed. Authorized Participants pay UNG a $1,000 transaction fee for each order placed to create one or more Creation Baskets or to redeem one or more Redemption Baskets. Partnership Capital and Allocation of Partnership Income and Losses Profit or loss shall be allocated among the partners of UNG in proportion to the number of shares each partner holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the LP Agreement . Calculation of Per Share NAV UNG’s per share NAV is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing that amount by the total number of shares outstanding. UNG uses the closing price for the contracts on the relevant exchange on that day to determine the value of contracts held on such exchange. Net Income (Loss) Per Share Net income (loss) per share is the difference between the per share NAV at the beginning of each period and at the end of each period. The weighted average number of shares outstanding was computed for purposes of disclosing net income (loss) per weighted average share. The weighted average shares are equal to the number of shares outstanding at the end of the period, adjusted proportionately for shares added and redeemed based on the amount of time the shares were outstanding during such period. There were no shares held by USCF at December 31, 2019. Offering Costs Offering costs incurred in connection with the registration of additional shares after the initial registration of shares are borne by UNG. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. These costs are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted. Cash Equivalents Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of six months or less. Reclassification Certain amounts in the accompanying financial statements were reclassified to conform to the current presentation. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires USCF to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions. Other On January 4, 2018, after the close of the NYSA Arca, UNG effected a 1‑for‑4 reverse share split and post-split shares of UNG began trading on January 5, 2018. The unaudited condensed financial information in this annual report on Form 10‑K gives effect to the reverse share split and the post-split shares as if they had been completed on January 1, 2018. The audited financial information and pro forma financial information, as well as the historical financial information as of and for the year ended December 31, 2018, was derived from UNG’s historical financial statements. The financial statements in this annual report on Form 10‑K are presented in accordance with Accounting Standards Codification 260 for purposes of presenting the 1‑for‑4 reverse split on historical basis for all periods reported.

FEES PAID BY THE FUND AND RELAT

FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS	12 Months Ended
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS	Dec. 31, 2019
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS
FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS	NOTE 3 — FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS USCF Management Fee Under the LP Agreement, USCF is responsible for investing the assets of UNG in accordance with the objectives and policies of UNG. In addition, USCF has arranged for one or more third parties to provide administrative, custody, accounting, transfer agency and other necessary services to UNG. For these services, UNG is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.60% per annum of average daily total net assets of $1,000,000,000 or less and 0.50% per annum of average daily total net assets that are greater than $1,000,000,000. Ongoing Registration Fees and Other Offering Expenses UNG pays all costs and expenses associated with the ongoing registration of its shares subsequent to the initial offering. These costs include registration or other fees paid to regulatory agencies in connection with the offer and sale of shares, and all legal, accounting, printing and other expenses associated with such offer and sale. For the years ended December 31, 2019, 2018 and 2017, UNG incurred $144,440, $83,258 and $204,998 respectively, in registration fees and other offering expenses. Independent Directors’ and Officers’ Expenses UNG is responsible for paying its portion of the directors’ and officers’ liability insurance for UNG and the Related Public Funds and the fees and expenses of the independent directors who also serve as audit committee members of UNG and the Related Public Funds. UNG shares the fees and expenses on a pro rata basis with each Related Public Fund, as described above, based on the relative assets of each Related Public Fund computed on a daily basis. These fees and expenses for the year ended December 31, 2019 were $556,951 for UNG and the Related Public Funds. UNG’s portion of such fees and expenses for the year ended December 31, 2019 was $70,739. For the year ended December 31, 2018, these fees and expenses were $521,689 for UNG and the Related Public Funds. UNG’s portion of such fees and expenses for the year ended December 31, 2018 was $69,624. For the year ended December 31, 2017, these fees and expenses were $536,375 for UNG and the Related Public Funds. UNG’s portion of such fees and expenses for the year ended December 31, 2017 was $64,982. Licensing Fees As discussed in Note 4 below, UNG entered into a licensing agreement with the NYMEX on April 10, 2006, as amended on October 20, 2011. Pursuant to the agreement, UNG and the Related Public Funds, other than BNO, USCI and CPER, pay a licensing fee that is equal to 0.015% on all net assets. During the years ended December 31, 2019, 2018 and 2017, UNG incurred $45,507, $56,477 and $74,309, respectively, under this arrangement. Investor Tax Reporting Cost The fees and expenses associated with UNG’s audit expenses and tax accounting and reporting requirements are paid by UNG. These costs were approximately $802,400 for the year ended December 31, 2019, approximately $928,800 for the year ended December 31, 2018 and approximately $1,000,000 for the year ended December 31, 2017. Tax reporting costs fluctuate between years due to the number of shareholders during any given year. Other Expenses and Fees In addition to the fees described above, UNG pays all brokerage fees and other expenses in connection with the operation of UNG, excluding costs and expenses paid by USCF as outlined in Note 4 – Contracts and Agreements below.

CONTRACTS AND AGREEMENTS

CONTRACTS AND AGREEMENTS	12 Months Ended
CONTRACTS AND AGREEMENTS	Dec. 31, 2019
CONTRACTS AND AGREEMENTS
CONTRACTS AND AGREEMENTS	NOTE 4 — CONTRACTS AND AGREEMENTS Marketing Agent Agreement UNG is party to a marketing agent agreement, dated as of April 17, 2007, as amended from time to time, with the Marketing Agent and USCF, whereby the Marketing Agent provides certain marketing services for UNG as outlined in the agreement. The fee of the Marketing Agent, which is borne by USCF, is equal to 0.06% on UNG’s assets up to $3 billion and 0.04% on UNG’s assets in excess of $3 billion. In no event may the aggregate compensation paid to the Marketing Agent and any affiliate of USCF for distribution-related services exceed 10% of the gross proceeds of UNG’s offering. The above fee does not include website construction and development, which are also borne by USCF. Brown Brothers Harriman & Co. Agreements UNG is also party to a custodian agreement, dated March 5, 2007, as amended from time to time, with Brown Brothers Harriman & Co. (“BBH&Co.”) and USCF, whereby BBH&Co. holds investments on behalf of UNG. USCF pays the fees of the custodian, which are determined by the parties from time to time. In addition, UNG is party to an administrative agency agreement, dated March 5, 2007, as amended from time to time, with USCF and BBH&Co., whereby BBH&Co. acts as the administrative agent, transfer agent and registrar for UNG. USCF also pays the fees of BBH&Co. for its services under such agreement and such fees are determined by the parties from time to time. Currently, USCF pays BBH&Co. for its services, in the foregoing capacities, a minimum amount of $75,000 annually for its custody, fund accounting and fund administration services rendered to UNG and each of the Related Public Funds, as well as a $20,000 annual fee for its transfer agency services. In addition, USCF pays BBH&Co. an asset-based charge of (a) 0.06% for the first $500 million of the Related Public Funds’ combined net assets, (b) 0.0465% for the Related Public Funds’ combined net assets greater than $500 million but less than $1 billion, and (c) 0.035% once the Related Public Funds’ combined net assets exceed $1 billion. The annual minimum amount will not apply if the asset-based charge for all accounts in the aggregate exceeds $75,000. USCF also pays BBH&Co. transaction fees ranging from $7 to $15 per transaction. Brokerage and Futures Commission Merchant Agreements On October 8, 2013, UNG entered into a brokerage agreement with RBC to serve as UNG’s FCM effective October 10, 2013. The agreement with RBC requires it to provide services to UNG in connection with the purchase and sale of Natural Gas Futures Contracts and Other Natural Gas-Related Investments that may be purchased and sold by or through RBC for UNG’s account. In accordance with the agreement, RBC charges UNG commissions of approximately $7 to $8 per round-turn trade, including applicable exchange, clearing and NFA fees for Natural Gas Futures Contracts and options on Natural Gas Futures Contracts. Such fees include those incurred when purchasing Natural Gas Futures Contracts and options on Natural Gas Futures Contracts when UNG issues shares as a result of a Creation Basket, as well as fees incurred when selling Natural Gas Futures Contracts and options on Natural Gas Futures Contracts when UNG redeems shares as a result of a Redemption Basket. Such fees are also incurred when Natural Gas Futures Contracts and options on Natural Gas Futures Contracts are purchased or redeemed for the purpose of rebalancing the portfolio. UNG also incurs commissions to brokers for the purchase and sale of Natural Gas Futures Contracts, Other Natural Gas-Related Investments or short-term obligations of the United States of two years or less (“Treasuries”). For the Year Ended For the Year Ended For the Year Ended December 31, 2019 December 31, 2018 December 31, 2017 Total commissions accrued to brokers $ 1,155,153 $ 1,424,713 $ 1,728,440 Total commissions as annualized percentage of average total net assets 0.38 % 0.38 % 0.35 % Commissions accrued as a result of rebalancing $ 964,567 $ 1,053,158 $ 1,420,519 Percentage of commissions accrued as a result of rebalancing 83.50 % 73.92 % 82.19 % Commissions accrued as a result of creation and redemption activity $ 190,586 $ 371,555 $ 307,921 Percentage of commissions accrued as a result of creation and redemption activity 16.50 % 26.08 % 17.81 % The decrease in total commissions accrued to brokers for the year ended December 31, 2019, compared to the year ended December 31, 2018, was due primarily to a lower number of natural gas futures contracts being held and traded. The decrease in total commissions accrued to brokers for the year ended December 31, 2018, compared to the year ended December 31, 2017, was due primarily to lower number of futures contracts being held and traded. However, there can be no assurance that commission costs and portfolio turnover will not cause commission expenses to rise in future quarters. NYMEX Licensing Agreement UNG and the NYMEX entered into a licensing agreement on April 10, 2006, as amended on October 20, 2011, whereby UNG was granted a non-exclusive license to use certain of the NYMEX’s settlement prices and service marks. Under the licensing agreement, UNG and the Related Public Funds, other than BNO, USCI, CPER, USOU and USOD, pay the NYMEX an asset-based fee for the license, the terms of which are described in Note 3. UNG expressly disclaims any association with the NYMEX or endorsement of UNG by the NYMEX and acknowledges that “NYMEX” and “New York Mercantile Exchange” are registered trademarks of the NYMEX.

FINANCIAL INSTRUMENTS, OFF-BALA

FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2019
FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES
FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES	NOTE 5 — FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES UNG may engage in the trading of futures contracts, options on futures contracts, cleared swaps and OTC swaps (collectively, “derivatives”). UNG is exposed to both market risk, which is the risk arising from changes in the market value of the contracts, and credit risk, which is the risk of failure by another party to perform according to the terms of a contract. UNG may enter into futures contracts, options on futures contracts and cleared swaps to gain exposure to changes in the value of an underlying commodity. A futures contract obligates the seller to deliver (and the purchaser to accept) the future delivery of a specified quantity and type of a commodity at a specified time and place. Some futures contracts may call for physical delivery of the asset, while others are settled in cash. The contractual obligations of a buyer or seller may generally be satisfied by taking or making physical delivery of the underlying commodity or by making an offsetting sale or purchase of an identical futures contract on the same or linked exchange before the designated date of delivery. Cleared swaps are agreements that are eligible to be cleared by a clearinghouse, e.g., ICE Clear Europe, and provide the efficiencies and benefits that centralized clearing on an exchange offers to traders of futures contracts, including credit risk intermediation and the ability to offset positions initiated with different counterparties. The purchase and sale of futures contracts, options on futures contracts and cleared swaps require margin deposits with an FCM. Additional deposits may be necessary for any loss on contract value. The Commodity Exchange Act requires an FCM to segregate all customer transactions and assets from the FCM’s proprietary activities. Futures contracts, options on futures contracts and cleared swaps involve, to varying degrees, elements of market risk (specifically commodity price risk) and exposure to loss in excess of the amount of variation margin. The face or contract amounts reflect the extent of the total exposure UNG has in the particular classes of instruments. Additional risks associated with the use of futures contracts are an imperfect correlation between movements in the price of the futures contracts and the market value of the underlying securities and the possibility of an illiquid market for a futures contract. Buying and selling options on futures contracts exposes investors to the risks of purchasing or selling futures contracts. All of the futures contracts held by UNG through December 31, 2019 were exchange-traded. The risks associated with exchange-traded contracts are generally perceived to be less than those associated with OTC swaps since, in OTC swaps, a party must rely solely on the credit of its respective individual counterparties. However, in the future, if UNG were to enter into non-exchange traded contracts, it would be subject to the credit risk associated with counterparty non-performance. The credit risk from counterparty non-performance associated with such instruments is the net unrealized gain, if any, on the transaction. UNG has credit risk under its futures contracts since the sole counterparty to all domestic and foreign futures contracts is the clearinghouse for the exchange on which the relevant contracts are traded. In addition, UNG bears the risk of financial failure by the clearing broker. UNG’s cash and other property, such as Treasuries, deposited with an FCM are considered commingled with all other customer funds, subject to the FCM’s segregation requirements. In the event of an FCM’s insolvency, recovery may be limited to a pro rata share of segregated funds available. It is possible that the recovered amount could be less than the total of cash and other property deposited. The insolvency of an FCM could result in the complete loss of UNG’s assets posted with that FCM; however, the majority of UNG’s assets are held in investments in Treasuries, cash and/or cash equivalents with UNG’s custodian and would not be impacted by the insolvency of an FCM. The failure or insolvency of UNG’s custodian, however, could result in a substantial loss of UNG’s assets. USCF invests a portion of UNG’s cash in money market funds that seek to maintain a stable per share NAV. UNG is exposed to any risk of loss associated with an investment in such money market funds. As of December 31, 2019 and December 31, 2018, UNG held investments in money market funds in the amounts of $160,000,000 and $33,700,000, respectively. UNG also holds cash deposits with its custodian. Pursuant to a written agreement with BBH&Co., uninvested overnight cash balances are swept to offshore branches of U.S. regulated and domiciled banks located in Toronto, Canada; London, United Kingdom; Grand Cayman, Cayman Islands; and Nassau, Bahamas; which are subject to U.S. regulation and regulatory oversight. As of December 31, 2019 and December 31, 2018, UNG held cash deposits and investments in Treasuries in the amounts of $298,998,451 and $326,091,174, respectively, with the custodian and FCM. Some or all of these amounts may be subject to loss should UNG’s custodian and/or FCM cease operations. For derivatives, risks arise from changes in the market value of the contracts. Theoretically, UNG is exposed to market risk equal to the value of futures contracts purchased and unlimited liability on such contracts sold short. As both a buyer and a seller of options, UNG pays or receives a premium at the outset and then bears the risk of unfavorable changes in the price of the contract underlying the option. UNG’s policy is to continuously monitor its exposure to market and counterparty risk through the use of a variety of financial, position and credit exposure reporting controls and procedures. In addition, UNG has a policy of requiring review of the credit standing of each broker or counterparty with which it conducts business. The financial instruments held by UNG are reported in its statements of financial condition at market or fair value, or at carrying amounts that approximate fair value, because of their highly liquid nature and short-term maturity.

FINANCIAL HIGHLIGHTS

FINANCIAL HIGHLIGHTS	12 Months Ended
FINANCIAL HIGHLIGHTS	Dec. 31, 2019
FINANCIAL HIGHLIGHTS
FINANCIAL HIGHLIGHTS	NOTE 6 — FINANCIAL HIGHLIGHTS The following table presents per share performance data and other supplemental financial data for the years ended December 31, 2019, 2018 and 2017 for the shareholders. This information has been derived from information presented in the financial statements. Year ended Year ended Year ended December 31, 2019 December 31, 2018 December 31, 2017 Per Share Operating Performance: Net asset value, beginning of year $ 24.35 $ 23.34 * $ 37.18 * Total income (loss) (7.16) 1.30 (13.49) * Total expenses (0.28) (0.29) (0.35) * Net increase (decrease) in net asset value (7.44) 1.01 (13.84) * Net asset value, end of year $ 16.91 $ 24.35 $ 23.34 * Total Return (30.55) % 4.33 % (37.22) % Ratios to Average Net Assets Total income (loss) (24.25) % 30.51 % (37.75) % Management fees 0.60 % 0.60 % 0.60 % Expenses excluding management fees 0.73 % 0.68 % 0.70 % Net income (loss) (25.58) % 29.23 % (39.05) % *On January 4, 2018, there was a 1‑for‑4 reverse share split. Historical shares outstanding, net asset value per share and market value per share have been adjusted for the period shown to reflect the 1‑for‑4 reverse share split on a retroactive basis. Total returns are calculated based on the change in value during the period. An individual shareholder’s total return and ratio may vary from the above total returns and ratios based on the timing of contributions to and withdrawals from UNG.

QUARTERLY FINANCIAL DATA (Unaud

QUARTERLY FINANCIAL DATA (Unaudited)	12 Months Ended
QUARTERLY FINANCIAL DATA (Unaudited)	Dec. 31, 2019
QUARTERLY FINANCIAL DATA (Unaudited)
QUARTERLY FINANCIAL DATA (Unaudited)	NOTE 7 - QUARTERLY FINANCIAL DATA (Unaudited) The following summarized (unaudited) quarterly financial information presents the results of operations and other data for three-month periods ended March 31, June 30, September 30 and December 31, 2019 and 2018. First Second Third Fourth Quarter Quarter Quarter Quarter 2019 2019 2019 2019 Total Income (Loss) $ 333,820 $ (39,678,429) $ 17,072,810 $ (51,306,936) Total Expenses 996,578 943,846 975,773 1,122,322 Net Income (Loss) $ (662,758) $ (40,622,275) $ 16,097,037 $ (52,429,258) Net Income (Loss) per Share $ (0.93) $ (3.59) $ 0.10 $ (3.02) First Second Third Fourth Quarter Quarter Quarter Quarter 2018 2018 2018 2018 Total Income (Loss) $ 12,500,875 $ 20,511,987 $ 20,645,726 $ 61,200,837 Total Expenses 1,403,254 1,177,669 1,074,103 1,166,937 Net Income (Loss) $ 11,097,621 $ 19,334,318 $ 19,571,623 $ 60,033,900 Net Income (Loss) per Share $ (0.80) $ 1.17 $ 1.15 $ (0.51)

FAIR VALUE OF FINANCIAL INSTRUM

FAIR VALUE OF FINANCIAL INSTRUMENTS	12 Months Ended
FAIR VALUE OF FINANCIAL INSTRUMENTS	Dec. 31, 2019
FAIR VALUE OF FINANCIAL INSTRUMENTS
FAIR VALUE OF FINANCIAL INSTRUMENTS	NOTE 8 — FAIR VALUE OF FINANCIAL INSTRUMENTS UNG values its investments in accordance with Accounting Standards Codification 820 – Fair Value Measurements and Disclosures (“ASC 820”). ASC 820 defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurement. The changes to past practice resulting from the application of ASC 820 relate to the definition of fair value, the methods used to measure fair value, and the expanded disclosures about fair value measurement. ASC 820 establishes a fair value hierarchy that distinguishes between: (1) market participant assumptions developed based on market data obtained from sources independent of UNG (observable inputs) and (2) UNG’s own assumptions about market participant assumptions developed based on the best information available under the circumstances (unobservable inputs). The three levels defined by the ASC 820 hierarchy are as follows: Level I – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level II – Inputs other than quoted prices included within Level I that are observable for the asset or liability, either directly or indirectly. Level II assets include the following: quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market-corroborated inputs). Level III – Unobservable pricing input at the measurement date for the asset or liability. Unobservable inputs shall be used to measure fair value to the extent that observable inputs are not available. In some instances, the inputs used to measure fair value might fall within different levels of the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement in its entirety falls shall be determined based on the lowest input level that is significant to the fair value measurement in its entirety. The following table summarizes the valuation of UNG’s securities at December 31, 2019 using the fair value hierarchy: At December 31, 2019 Total Level I Level II Level III Short-Term Investments $ 418,959,876 $ 418,959,876 $ — $ — Exchange-Traded Futures Contracts United States Contracts (20,768,690) (20,768,690) — — During the year ended December 31, 2019, there were no transfers between Level I and Level II. The following table summarizes the valuation of UNG’s securities at December 31, 2018 using the fair value hierarchy: At December 31, 2018 Total Level I Level II Level III Short-Term Investments $ 272,193,228 $ 272,193,228 $ — $ — Exchange-Traded Futures Contracts United States Contracts (67,021,257) (67,021,257) — — During the year ended December 31, 2018, there were no transfers between Level I and Level II. Effective January 1, 2009, UNG adopted the provisions of Accounting Standards Codification 815 — Derivatives and Hedging, which require presentation of qualitative disclosures about objectives and strategies for using derivatives, quantitative disclosures about fair value amounts and gains and losses on derivatives. Fair Value of Derivative Instruments Derivatives not Accounted for Fair Value Fair Value as Hedging Statements of Financial At December 31, At December 31, Instruments Condition Location 2019 2018 Futures - Commodity Contracts Assets $ (20,768,690) $ (67,021,257) The Effect of Derivative Instruments on the Statements of Operations For the year ended For the year ended For the year ended December 31, 2019 December 31, 2018 December 31, 2017 Change in Change in Change in Derivatives Location of Realized Unrealized Realized Unrealized Realized Unrealized not Accounted Gain (Loss) Gain (Loss) Gain (Loss) on Gain (Loss) Gain (Loss) on Gain (Loss) on Gain (Loss) on for as on Derivatives on Derivatives Derivatives on Derivatives Derivatives Derivatives Derivatives Hedging Recognized in Recognized in Recognized in Recognized in Recognized in Recognized in Recognized in Instruments Income Income Income Income Income Income Income Futures - Commodity Contracts Realized gain (loss) on closed positions $ (126,561,127) $ 230,893,690 $ (209,701,928) Change in unrealized gain (loss) on open positions $ 46,252,567 $ (122,742,937) $ 18,286,173

RECENT ACCOUNTING PRONOUNCEMENT

RECENT ACCOUNTING PRONOUNCEMENTS	12 Months Ended
RECENT ACCOUNTING PRONOUNCEMENTS	Dec. 31, 2019
RECENT ACCOUNTING PRONOUNCEMENTS
RECENT ACCOUNTING PRONOUNCEMENTS	NOTE 9 — RECENT ACCOUNTING PRONOUNCEMENTS In August 2018, the FASB issued Accounting Standards Update (“ASU”) No. 2018-13, which changes certain fair value measurement disclosure requirements. The new ASU, in addition to other modifications and additions, removes the requirement to disclose the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, and the Funds’ policy for the timing of transfers between levels. The amendments are effective for financial statements issued for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. The Fund has evaluated the implications of certain provisions of the ASU and has determined that there will be no material impacts to the financial statements.

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2019
SUBSEQUENT EVENTS
SUBSEQUENT EVENTS	NOTE 10 — SUBSEQUENT EVENTS UNG has performed an evaluation of subsequent events through the date the financial statements were issued. This evaluation did not result in any subsequent events that necessitated disclosures and/or adjustments.

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Dec. 31, 2019
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Basis of Presentation	Basis of Presentation The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP") as detailed in the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification. UNG is an investment company and follows the accounting and reporting guidance in FASB Topic 946.
Revenue Recognition	Revenue Recognition Commodity futures contracts, forward contracts, physical commodities and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the statements of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the financial statements. Changes in the unrealized gains or losses between periods are reflected in the statements of operations. UNG earns income on funds held at the custodian or a futures commission merchant (“FCM”) at prevailing market rates earned on such investments.
Brokerage Commissions	Brokerage Commissions Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis.
Income Taxes	Income Taxes UNG is not subject to federal income taxes; each partner reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return. In accordance with U.S. GAAP, UNG is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. UNG files an income tax return in the U.S. federal jurisdiction and may file income tax returns in various U.S. states. UNG is not subject to income tax return examinations by major taxing authorities for years before 2016. The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in UNG recording a tax liability that reduces net assets. However, UNG’s conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analysis of and changes to tax laws, regulations and interpretations thereof. UNG recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the year ended December 31, 2019.
Creations and Redemptions	Creations and Redemptions Authorized Participants may purchase Creation Baskets or redeem Redemption Baskets only in blocks of 100,000 shares at a price equal to the NAV of the shares calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed. UNG receives or pays the proceeds from shares sold or redeemed within two business days after the trade date of the purchase or redemption. The amounts due from Authorized Participants are reflected in UNG’s statements of financial condition as receivable for shares sold and amounts payable to Authorized Participants upon redemption are reflected as payable for shares redeemed. Authorized Participants pay UNG a $1,000 transaction fee for each order placed to create one or more Creation Baskets or to redeem one or more Redemption Baskets.
Partnership Capital and Allocation of Partnership Income and Losses	Partnership Capital and Allocation of Partnership Income and Losses Profit or loss shall be allocated among the partners of UNG in proportion to the number of shares each partner holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the LP Agreement .
Calculation of Per Share NAV	Calculation of Per Share NAV UNG’s per share NAV is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing that amount by the total number of shares outstanding. UNG uses the closing price for the contracts on the relevant exchange on that day to determine the value of contracts held on such exchange.
Net Income (Loss) Per Share	Net Income (Loss) Per Share Net income (loss) per share is the difference between the per share NAV at the beginning of each period and at the end of each period. The weighted average number of shares outstanding was computed for purposes of disclosing net income (loss) per weighted average share. The weighted average shares are equal to the number of shares outstanding at the end of the period, adjusted proportionately for shares added and redeemed based on the amount of time the shares were outstanding during such period. There were no shares held by USCF at December 31, 2019.
Offering Costs	Offering Costs Offering costs incurred in connection with the registration of additional shares after the initial registration of shares are borne by UNG. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. These costs are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted.
Cash Equivalents	Cash Equivalents Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of six months or less.
Reclassification	Reclassification Certain amounts in the accompanying financial statements were reclassified to conform to the current presentation.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires USCF to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions.
Other	Other On January 4, 2018, after the close of the NYSA Arca, UNG effected a 1‑for‑4 reverse share split and post-split shares of UNG began trading on January 5, 2018. The unaudited condensed financial information in this annual report on Form 10‑K gives effect to the reverse share split and the post-split shares as if they had been completed on January 1, 2018. The audited financial information and pro forma financial information, as well as the historical financial information as of and for the year ended December 31, 2018, was derived from UNG’s historical financial statements. The financial statements in this annual report on Form 10‑K are presented in accordance with Accounting Standards Codification 260 for purposes of presenting the 1‑for‑4 reverse split on historical basis for all periods reported.

CONTRACTS AND AGREEMENTS (Table

CONTRACTS AND AGREEMENTS (Tables)	12 Months Ended
CONTRACTS AND AGREEMENTS (Tables)	Dec. 31, 2019
CONTRACTS AND AGREEMENTS
Schedule of Brokerage Commissions	For the Year Ended For the Year Ended For the Year Ended December 31, 2019 December 31, 2018 December 31, 2017 Total commissions accrued to brokers $ 1,155,153 $ 1,424,713 $ 1,728,440 Total commissions as annualized percentage of average total net assets 0.38 % 0.38 % 0.35 % Commissions accrued as a result of rebalancing $ 964,567 $ 1,053,158 $ 1,420,519 Percentage of commissions accrued as a result of rebalancing 83.50 % 73.92 % 82.19 % Commissions accrued as a result of creation and redemption activity $ 190,586 $ 371,555 $ 307,921 Percentage of commissions accrued as a result of creation and redemption activity 16.50 % 26.08 % 17.81 %

FINANCIAL HIGHLIGHTS (Tables)

FINANCIAL HIGHLIGHTS (Tables)	12 Months Ended
FINANCIAL HIGHLIGHTS (Tables)	Dec. 31, 2019
FINANCIAL HIGHLIGHTS
Schedule of per share performance data and other supplemental financial data	The following table presents per share performance data and other supplemental financial data for the years ended December 31, 2019, 2018 and 2017 for the shareholders. This information has been derived from information presented in the financial statements. Year ended Year ended Year ended December 31, 2019 December 31, 2018 December 31, 2017 Per Share Operating Performance: Net asset value, beginning of year $ 24.35 $ 23.34 * $ 37.18 * Total income (loss) (7.16) 1.30 (13.49) * Total expenses (0.28) (0.29) (0.35) * Net increase (decrease) in net asset value (7.44) 1.01 (13.84) * Net asset value, end of year $ 16.91 $ 24.35 $ 23.34 * Total Return (30.55) % 4.33 % (37.22) % Ratios to Average Net Assets Total income (loss) (24.25) % 30.51 % (37.75) % Management fees 0.60 % 0.60 % 0.60 % Expenses excluding management fees 0.73 % 0.68 % 0.70 % Net income (loss) (25.58) % 29.23 % (39.05) % *On January 4, 2018, there was a 1‑for‑4 reverse share split. Historical shares outstanding, net asset value per share and market value per share have been adjusted for the period shown to reflect the 1‑for‑4 reverse share split on a retroactive basis.

QUARTERLY FINANCIAL DATA (Una_2

QUARTERLY FINANCIAL DATA (Unaudited) (Tables)	12 Months Ended
QUARTERLY FINANCIAL DATA (Unaudited) (Tables)	Dec. 31, 2019
QUARTERLY FINANCIAL DATA (Unaudited)
Quarterly Financial Data	The following summarized (unaudited) quarterly financial information presents the results of operations and other data for three-month periods ended March 31, June 30, September 30 and December 31, 2019 and 2018. First Second Third Fourth Quarter Quarter Quarter Quarter 2019 2019 2019 2019 Total Income (Loss) $ 333,820 $ (39,678,429) $ 17,072,810 $ (51,306,936) Total Expenses 996,578 943,846 975,773 1,122,322 Net Income (Loss) $ (662,758) $ (40,622,275) $ 16,097,037 $ (52,429,258) Net Income (Loss) per Share $ (0.93) $ (3.59) $ 0.10 $ (3.02) First Second Third Fourth Quarter Quarter Quarter Quarter 2018 2018 2018 2018 Total Income (Loss) $ 12,500,875 $ 20,511,987 $ 20,645,726 $ 61,200,837 Total Expenses 1,403,254 1,177,669 1,074,103 1,166,937 Net Income (Loss) $ 11,097,621 $ 19,334,318 $ 19,571,623 $ 60,033,900 Net Income (Loss) per Share $ (0.80) $ 1.17 $ 1.15 $ (0.51)

FAIR VALUE OF FINANCIAL INSTR_2

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	Dec. 31, 2019
FAIR VALUE OF FINANCIAL INSTRUMENTS
Schedule of Valuation of UNG's Securities Using the Fair Value Hierarchy	The following table summarizes the valuation of UNG’s securities at December 31, 2019 using the fair value hierarchy: At December 31, 2019 Total Level I Level II Level III Short-Term Investments $ 418,959,876 $ 418,959,876 $ — $ — Exchange-Traded Futures Contracts United States Contracts (20,768,690) (20,768,690) — — During the year ended December 31, 2019, there were no transfers between Level I and Level II. The following table summarizes the valuation of UNG’s securities at December 31, 2018 using the fair value hierarchy: At December 31, 2018 Total Level I Level II Level III Short-Term Investments $ 272,193,228 $ 272,193,228 $ — $ — Exchange-Traded Futures Contracts United States Contracts (67,021,257) (67,021,257) — —
Schedule of Fair Value of Derivative Instruments	Fair Value of Derivative Instruments Derivatives not Accounted for Fair Value Fair Value as Hedging Statements of Financial At December 31, At December 31, Instruments Condition Location 2019 2018 Futures - Commodity Contracts Assets $ (20,768,690) $ (67,021,257)
Schedule of Effect of Derivative Instruments on the Condensed Statements of Operations	The Effect of Derivative Instruments on the Statements of Operations For the year ended For the year ended For the year ended December 31, 2019 December 31, 2018 December 31, 2017 Change in Change in Change in Derivatives Location of Realized Unrealized Realized Unrealized Realized Unrealized not Accounted Gain (Loss) Gain (Loss) Gain (Loss) on Gain (Loss) Gain (Loss) on Gain (Loss) on Gain (Loss) on for as on Derivatives on Derivatives Derivatives on Derivatives Derivatives Derivatives Derivatives Hedging Recognized in Recognized in Recognized in Recognized in Recognized in Recognized in Recognized in Instruments Income Income Income Income Income Income Income Futures - Commodity Contracts Realized gain (loss) on closed positions $ (126,561,127) $ 230,893,690 $ (209,701,928) Change in unrealized gain (loss) on open positions $ 46,252,567 $ (122,742,937) $ 18,286,173

ORGANIZATION AND BUSINESS (Deta

ORGANIZATION AND BUSINESS (Details)

Jan. 04, 2018$ / sharesshares

Feb. 21, 2012$ / sharesshares

Apr. 30, 2007

Apr. 18, 2007USD ($)$ / sharesshares

Dec. 31, 2019contract$ / shares$ / item

Dec. 31, 2018$ / shares

Dec. 31, 2017$ / shares

[1]

Dec. 31, 2016$ / shares

[1]

Organization, Consolidation and Presentation of Financial Statements Disclosure

Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | $ / item

1,000

Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission

30,000,000

Net Asset Value Per Unit | $ / shares

$ 16.91

$ 24.35

$ 23.34

$ 37.18

Number of units issued | shares

200,000

Value of unit issued | $

$ 10,001,000

Number of registered units

2,280,000,000

Committee For Uniform Securities Identification Procedure Cusip

CUSIP number for UNG's shares changed to 912318300

CUSIP number for UNG's shares changed to 912318201

Operations Commenced Date

Apr. 18,
2007

Reverse unit split ratio

Pre-split units of USNG automatically exchanged for one post-split unit

Prior to Reverse Split [Member]

Organization, Consolidation and Presentation of Financial Statements Disclosure

Net Asset Value Per Unit | $ / shares

$ 5.69

$ 5.51

$ 50

Issued units | shares

97,466,476

174,297,828

Stockholders' Equity, Reverse Stock Split

1-for-4 reverse share split

Following Reverse Split [Member]

Organization, Consolidation and Presentation of Financial Statements Disclosure

Net Asset Value Per Unit | $ / shares

$ 22.76

$ 22.04

Capital Units, Outstanding | shares

24,366,619

43,574,457

Creation Baskets [Member]

Organization, Consolidation and Presentation of Financial Statements Disclosure

Number of units per basket | $ / item

100,000

Redemption Baskets [Member]

Organization, Consolidation and Presentation of Financial Statements Disclosure

Number of units per basket | $ / item

100,000

Open Futures Contracts - Long [Member] | United States Contracts

Organization, Consolidation and Presentation of Financial Statements Disclosure

Number of Contracts

20,310

[2]

12,935

[3]

Open Futures Contracts - Long [Member] | United States Contracts | NYMEX Natural Gas Futures Contracts [Member]

Organization, Consolidation and Presentation of Financial Statements Disclosure

Number of Contracts | contract

20,310

[1]

On January 4, 2018, there was a 1for4 reverse share split. The Statement of Changes in Partners’ Capital have been adjusted for the period shown to reflect the 1for4 reverse share split on a retroactive basis.

[2]

Collateral amounted to $83,410,316 on open futures contracts.

[3]

Collateral amounted to $100,299,442 on open futures contracts.

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	Dec. 31, 2019$ / item
Significant Accounting Policies
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets	1,000
Redemption Baskets [Member]
Significant Accounting Policies
Number of units per basket	100,000

FEES PAID BY THE FUND AND REL_2

FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fees Paid and Related Party Transactions [Line Items]
USCF Management Fee	UNG is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.60% per annum of average daily total net assets of $1,000,000,000 or less and 0.50% per annum of average daily total net assets that are greater than $1,000,000,000
Licensing fee incurred	$ 45,507	$ 56,477	$ 74,309
Estimated investor tax reporting cost	802,400	928,800	1,000,000
Estimated directors fees and expenses	70,739	69,624	64,982
USNG and the Related Public Funds [Member]
Fees Paid and Related Party Transactions [Line Items]
Estimated directors fees and expenses	556,951	521,689	536,375
UNITED STATES GAS FUND LP [Member]
Fees Paid and Related Party Transactions [Line Items]
Estimated directors fees and expenses	$ 70,739	69,624	64,982
Licensing Agreements [Member]
Fees Paid and Related Party Transactions [Line Items]
Fee percentage	0.015%
United States Oil Fund LP [Member]
Fees Paid and Related Party Transactions [Line Items]
Ongoing Registration Fees and Other Offering Expenses	$ 144,440	$ 83,258	$ 204,998

CONTRACTS AND AGREEMENTS - Brok

CONTRACTS AND AGREEMENTS - Brokerage Commission (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Commissions accrued to brokers	$ 1,155,153	$ 1,424,713	$ 1,728,440
Percentage of commissions accrued	0.38%	0.38%	0.35%
Rebalancing Investments Transaction [Member]
Commissions accrued to brokers	$ 964,567	$ 1,053,158	$ 1,420,519
Percentage of commissions accrued	83.50%	73.92%	82.19%
Creation And Redemption Activity [Member]
Commissions accrued to brokers	$ 190,586	$ 371,555	$ 307,921
Percentage of commissions accrued	16.50%	26.08%	17.81%

CONTRACTS AND AGREEMENTS - Addi

CONTRACTS AND AGREEMENTS - Additional Information (Details)	12 Months Ended
CONTRACTS AND AGREEMENTS - Additional Information (Details)	Dec. 31, 2019USD ($)$ / item
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Annual Fee for custody, fund accounting and fund administration services	$ 20,000
Maximum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Annual Fee for custody, fund accounting and fund administration services	$ 75,000
Transaction fees per transaction \| $ / item	15
Commissions per round-turn trade, including applicable exchange and NFA fees for Futures Contracts and options on Futures Contracts \| $ / item	8
Minimum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Annual Fee for custody, fund accounting and fund administration services	$ 75,000
Transaction fees per transaction \| $ / item	7
Commissions per round-turn trade, including applicable exchange and NFA fees for Futures Contracts and options on Futures Contracts \| $ / item	7
First $500 million of USNG's, USOF's, US12OF's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.06%
First $500 million of USNG's, USOF's, US12OF's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets [Member] \| Maximum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	$ 500,000,000
USNG's, USOF's, US12OF's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than $500 million but less than $1 billion [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.0465%
Base amount for determining fee percentage	$ 1,000,000,000
USNG's, USOF's, US12OF's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets greater than $500 million but less than $1 billion [Member] \| Maximum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	$ 500,000,000
USNG's, USOF's, US12OF's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets exceed $1 billion [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.035%
USNG's, USOF's, US12OF's, UGA's, USDHO's, USSO's, US12NG's, USBO's, USCI's, CPER's, USAG's and USMI's combined net assets exceed $1 billion [Member] \| Maximum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	$ 1,000,000,000
Marketing Agreement [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.04%
Marketing Agreement [Member] \| USNG's assets up to $3 billion [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.06%
Base amount for determining fee percentage	$ 3,000,000,000
Marketing Agreement [Member] \| USNG's assets in excess of $3 billion [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	10.00%
Marketing Agreement [Member] \| USNG's assets in excess of $3 billion [Member] \| Minimum [Member]
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	$ 3,000,000,000

FINANCIAL INSTRUMENTS, OFF-BA_2

FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES
Cash investments in money market funds	$ 160,000,000	$ 33,700,000
Deposits in domestic and foreign financial institutions	$ 298,998,451	$ 326,091,174

FINANCIAL HIGHLIGHTS - Per shar

FINANCIAL HIGHLIGHTS - Per share performance data and other supplemental financial data (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2017
Per Share Operating Performance:
Net asset value, beginning of period	$ 24.35	$ 23.34	[1]	$ 37.18	[1]
Total income (loss)	(7.16)	1.30		(13.49)
Total expenses	(0.28)	(0.29)		(0.35)
Net increase (decrease) in net asset value	(7.44)	1.01		(13.84)
Net asset value, end of period	$ 16.91	$ 24.35		$ 23.34	[1]
Total Return	(30.55%)	4.33%		(37.22%)
Ratios to Average Net Assets
Total income (loss)	(24.25%)	30.51%		(37.75%)
Management fees	0.60%	0.60%		0.60%
Expenses excluding management fees	0.73%	0.68%		0.70%
Net income (loss)	(25.58%)	29.23%		(39.05%)

[1]	On January 4, 2018, there was a 1for4 reverse share split. The Statement of Changes in Partners’ Capital have been adjusted for the period shown to reflect the 1for4 reverse share split on a retroactive basis.

QUARTERLY FINANCIAL DATA (Una_3

QUARTERLY FINANCIAL DATA (Unaudited) (Summarized Quarterly Financial Information) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
QUARTERLY FINANCIAL DATA (Unaudited)
Total Income (Loss)	$ (51,306,936)	$ 17,072,810	$ (39,678,429)	$ 333,820	$ 61,200,837	$ 20,645,726	$ 20,511,987	$ 12,500,875	$ (73,578,735)	$ 114,859,425	$ (187,008,870)
Total Expenses	1,122,322	975,773	943,846	996,578	1,166,937	1,074,103	1,177,669	1,403,254	4,038,519	4,821,963	6,435,105
Net Income (Loss)	$ (52,429,258)	$ 16,097,037	$ (40,622,275)	$ (662,758)	$ 60,033,900	$ 19,571,623	$ 19,334,318	$ 11,097,621	$ (77,617,254)	$ 110,037,462	$ (193,443,975)
Net Income (Loss) per Share	$ (3.02)	$ 0.10	$ (3.59)	$ (0.93)	$ (0.51)	$ 1.15	$ 1.17	$ (0.80)

FAIR VALUE OF FINANCIAL INSTR_3

FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation of Securities Using Fair Value Hierarchy (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	$ 418,959,876	$ 272,193,228
Exchange-Traded Futures Contracts [Member] \| United States Contracts [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	(20,768,690)	(67,021,257)
Fair Value, Inputs, Level 1 [Member] \| Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	418,959,876	272,193,228
Fair Value, Inputs, Level 1 [Member] \| Exchange-Traded Futures Contracts [Member] \| United States Contracts [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	(20,768,690)	(67,021,257)
Fair Value, Inputs, Level 2 [Member] \| Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
Fair Value, Inputs, Level 2 [Member] \| Exchange-Traded Futures Contracts [Member] \| United States Contracts [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
Fair Value, Inputs, Level 3 [Member] \| Short-Term Investments [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	0	0
Fair Value, Inputs, Level 3 [Member] \| Exchange-Traded Futures Contracts [Member] \| United States Contracts [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	$ 0	$ 0

FAIR VALUE OF FINANCIAL INSTR_4

FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value of Derivative Instruments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Commodity Contracts [Member] \| Futures - Commodity Contracts [Member] \| Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (20,768,690)	$ (67,021,257)

FAIR VALUE OF FINANCIAL INSTR_5

FAIR VALUE OF FINANCIAL INSTRUMENTS - Effect of Derivative Instruments on Condensed Statements of Operations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income	$ 46,252,567	$ (122,742,937)	$ 18,286,173
Commodity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income	46,252,567	(122,742,937)	18,286,173
Commodity Contracts [Member] \| Futures - Commodity Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain (Loss) on Derivatives Recognized in Income	$ (126,561,127)	$ 230,893,690	$ (209,701,928)