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|View History: Annual Download Data (XLS File)                                          
|View History: Annual                                                                    
|View History: Annual                                                                    
|View History:                                                                           
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|Montana Natural Gas, Wet After Lease Separation Reserves Extensions (Billion Cubic Feet)
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|Montana Natural Gas, Wet After Lease Separation Reserves Extensions (Billion Cubic Feet)
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|Decade                                                                                                                            | Year-0 | Year-1 | Year-2 | Year-3 | Year-4 | Year-5 | Year-6 | Year-7 | Year-8 | Year-9
|--------------------------------------------------------------------------------------------------------------------------------- | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------
|1970's                                                                                                                            |        |        |        |        |        |        |        |        |        | 47    
|1980's                                                                                                                            | 45     | 60     | 34     | 31     | 39     | 3      | 7      | 3      | 1      | 129   
|1990's                                                                                                                            | 40     | 18     | 16     | 0      | 1      | 0      | 2      | 22     | 6      | 15    
|2000's                                                                                                                            | 58     | 37     | 97     | 147    | 132    | 131    | 145    | 82     | 76     | 33    
|2010's                                                                                                                            | 88     | 14     | 38     | 37     | 79     | 3      | --     | --     | --     | --    
|2020's                                                                                                                            | --     | --     |        |        |        |        |        |        |        |       
|- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
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|Release Date: 12/30/2022                                                                                                         
|Next Release Date: 12/29/2023