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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 Proved Reserves (Billion Cubic Feet)
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|Montana Natural Gas, Wet After Lease Separation Proved Reserves (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                                                                                                                            |        |        |        |        |        |        |        |        |        | 837   
|1980's                                                                                                                            | 1,308  | 1,336  | 870    | 921    | 825    | 884    | 823    | 801    | 834    | 889   
|1990's                                                                                                                            | 920    | 848    | 875    | 684    | 727    | 792    | 806    | 769    | 789    | 851   
|2000's                                                                                                                            | 892    | 907    | 914    | 1,068  | 1,002  | 998    | 1,069  | 1,067  | 1,014  | 993   
|2010's                                                                                                                            | 959    | 792    | 616    | 590    | 686    | 712    | 586    | 631    | 612    | 631   
|2020's                                                                                                                            | 570    | 736    |        |        |        |        |        |        |        |       
|- = 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