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Supplementary Oil And Gas Information (Unaudited) - Future Net Cash Flows Relating to Proved Crude Oil and Natural Gas Reserves (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Line Items]        
Future cash inflows $ 882,968 $ 870,755 $ 995,482  
Future production costs (288,515) (279,014) (305,959)  
Future development costs and asset retirement obligations (96,229) (90,415) (86,658)  
Future income taxes (110,342) (113,057) (137,288)  
Future net cash flows 387,882 388,269 465,577  
10% annual discount for timing of future cash flows (275,724) (279,533) (328,579)  
Standardized measure of future net cash flows (1) 112,158 108,736 136,998 $ 82,784
North America        
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Line Items]        
Future cash inflows 876,917 863,544 986,672  
Future production costs (286,440) (276,498) (303,270)  
Future development costs and asset retirement obligations (92,455) (86,615) (83,803)  
Future income taxes (111,073) (113,516) (136,905)  
Future net cash flows 386,949 386,915 462,694  
10% annual discount for timing of future cash flows (275,139) (278,814) (327,333)  
Standardized measure of future net cash flows (1) 111,810 108,101 135,361  
North Sea        
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Line Items]        
Future cash inflows 722 1,067 1,506  
Future production costs (414) (636) (691)  
Future development costs and asset retirement obligations (1,970) (1,873) (1,416)  
Future income taxes 1,144 967 517  
Future net cash flows (518) (475) (84)  
10% annual discount for timing of future cash flows 136 168 84  
Standardized measure of future net cash flows (1) (382) (307) 0  
Offshore Africa        
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Line Items]        
Future cash inflows 5,329 6,144 7,304  
Future production costs (1,661) (1,880) (1,998)  
Future development costs and asset retirement obligations (1,804) (1,927) (1,439)  
Future income taxes (413) (508) (900)  
Future net cash flows 1,451 1,829 2,967  
10% annual discount for timing of future cash flows (721) (887) (1,330)  
Standardized measure of future net cash flows (1) $ 730 $ 942 $ 1,637