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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 Adjustments (Billion Cubic Feet)
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|Montana Natural Gas, Wet After Lease Separation Reserves Adjustments (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                                                                                                                            |        |        |        |        |        |        |        |        |        | -60   
|1980's                                                                                                                            | 584    | 24     | -439   | 77     | -75    | 61     | -67    | -26    | 76     | -102  
|1990's                                                                                                                            | 28     | -30    | 59     | -159   | 143    | -4     | 17     | 31     | -12    | 46    
|2000's                                                                                                                            | 10     | 53     | 57     | -29    | -59    | 8      | 13     | 11     | -3     | 140   
|2010's                                                                                                                            | -22    | -58    | 43     | 6      | 43     | 141    | -120   | 22     | 43     | 92    
|2020's                                                                                                                            | -32    | 32     |        |        |        |        |        |        |        |       
|- = 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