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Supplemental information on oil and gas producing activities (unaudited) - Reserve information (Details) - gal
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Supplemental information on oil and gas producing activities (unaudited)      
Opening balance 1,883 2,011 2,002
Proved reserves, Revisions of previous estimates [1] 84 9 63
Proved reserves, Improved recovery 97 93 81
Proved reserves, Purchases 35 0 48
Proved reserves, Extensions and discoveries 49 17 57
Proved reserves, Sales (6) 0 0
Proved reserves, Production (250) (247) (240)
Closing balance 1,892 1,883 2,011
Proved developed reserves: Opening balance 1,435 1,376 1,370
Proved developed reserves: Closing balance 1,394 1,435 1,376
Proved undeveloped reserves: Opening balance 448 635 632
Proved undeveloped reserves: Closing balance 498 448 635
Gas      
Supplemental information on oil and gas producing activities (unaudited)      
Opening balance 2,346 2,828 3,151
Proved reserves, Revisions of previous estimates [1] (55) (165) (104)
Proved reserves, Improved recovery 102 9 21
Proved reserves, Purchases 5 0 50
Proved reserves, Extensions and discoveries 40 0 33
Proved reserves, Sales (5) 0 0
Proved reserves, Production (317) (326) (323)
Closing balance 2,116 2,346 2,828
Proved developed reserves: Opening balance 2,007 2,174 2,561
Proved developed reserves: Closing balance 1,750 2,007 2,174
Proved undeveloped reserves: Opening balance 339 654 590
Proved undeveloped reserves: Closing balance 366 339 654
Oil      
Supplemental information on oil and gas producing activities (unaudited)      
Opening balance 1,471 1,515 1,449
Proved reserves, Revisions of previous estimates [1] 94 38 81
Proved reserves, Improved recovery 79 91 77
Proved reserves, Purchases 35 0 39
Proved reserves, Extensions and discoveries 42 17 52
Proved reserves, Sales (5) 0 0
Proved reserves, Production (194) (190) (183)
Closing balance 1,522 1,471 1,515
Proved developed reserves: Opening balance 1,083 995 921
Proved developed reserves: Closing balance 1,087 1,083 995
Proved undeveloped reserves: Opening balance 388 520 528
Proved undeveloped reserves: Closing balance 435 388 520
[1] Represents changes in previous proved reserves, upward or downward, resulting from new information (except for an increase in a proved area), usually obtained from development drilling and production history or result from changes in economic factors.