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SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Future Net Cash Flows Relating to Proved Crude Oil and Natural Gas Reserves (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Future cash inflows $ 531,752 $ 519,006 $ 426,706  
Future production costs (201,050) (200,819) (204,348)  
Future development costs and asset retirement obligations (74,603) (67,210) (65,280)  
Future income taxes (55,242) (62,636) (36,488)  
Future net cash flows 200,857 188,341 120,590  
10% annual discount for timing of future cash flows (137,332) (128,015) (73,685)  
Standardized measure of future net cash flows 63,525 60,326 46,905 $ 24,315
North America        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Future cash inflows 515,864 500,557 413,180  
Future production costs (194,076) (193,387) (198,304)  
Future development costs and asset retirement obligations (70,879) (63,202) (61,169)  
Future income taxes (53,759) (60,526) (35,645)  
Future net cash flows 197,150 183,442 118,062  
10% annual discount for timing of future cash flows (136,616) (126,699) (73,171)  
Standardized measure of future net cash flows 60,534 56,743 44,891  
North Sea        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Future cash inflows 10,030 12,002 8,740  
Future production costs (4,893) (5,148) (4,168)  
Future development costs and asset retirement obligations (2,648) (2,909) (2,853)  
Future income taxes (936) (1,484) (595)  
Future net cash flows 1,553 2,461 1,124  
10% annual discount for timing of future cash flows (1) (545) (59)  
Standardized measure of future net cash flows 1,552 1,916 1,065  
Offshore Africa        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]        
Future cash inflows 5,858 6,447 4,786  
Future production costs (2,081) (2,284) (1,876)  
Future development costs and asset retirement obligations (1,076) (1,099) (1,258)  
Future income taxes (547) (626) (248)  
Future net cash flows 2,154 2,438 1,404  
10% annual discount for timing of future cash flows (715) (771) (455)  
Standardized measure of future net cash flows $ 1,439 $ 1,667 $ 949