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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | $ 692,495 | $ 414,238 | $ 531,752 |
Future production costs | (244,036) | (208,604) | (201,050) |
Future development costs and asset retirement obligations | (80,374) | (76,097) | (74,603) |
Future income taxes | (83,144) | (27,536) | (55,242) |
Future net cash flows | 284,941 | 102,001 | 200,857 |
10% annual discount for timing of future cash flows | (202,157) | (74,490) | (137,332) |
Standardized measure of future net cash flows | 82,784 | 27,511 | 63,525 | $ 60,326
North America |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | 679,123 | 404,193 | 515,864 |
Future production costs | (238,144) | (203,599) | (194,076) |
Future development costs and asset retirement obligations | (77,375) | (72,935) | (70,879) |
Future income taxes | (81,860) | (27,178) | (53,759) |
Future net cash flows | 281,744 | 100,481 | 197,150 |
10% annual discount for timing of future cash flows | (201,227) | (74,395) | (136,616) |
Standardized measure of future net cash flows | 80,517 | 26,086 | 60,534 |
North Sea |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | 7,791 | 5,873 | 10,030 |
Future production costs | (4,074) | (3,259) | (4,893) |
Future development costs and asset retirement obligations | (1,857) | (2,130) | (2,648) |
Future income taxes | (719) | (141) | (936) |
Future net cash flows | 1,141 | 343 | 1,553 |
10% annual discount for timing of future cash flows | (142) | 278 | (1) |
Standardized measure of future net cash flows | 999 | 621 | 1,552 |
Offshore Africa |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future cash inflows | 5,581 | 4,172 | 5,858 |
Future production costs | (1,818) | (1,746) | (2,081) |
Future development costs and asset retirement obligations | (1,142) | (1,032) | (1,076) |
Future income taxes | (565) | (217) | (547) |
Future net cash flows | 2,056 | 1,177 | 2,154 |
10% annual discount for timing of future cash flows | (788) | (373) | (715) |
Standardized measure of future net cash flows | $ 1,268 | $ 804 | $ 1,439 |

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- Definition Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Development Costs and Asset Retirement Obligations + References No definition available. + Details
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- Definition Amount of estimated future accumulated cash inflow from the sale of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 + Details
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- Definition Amount of estimated future accumulated cash outflow for income tax, based on the future income less future expense derived from production and sale of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 + Details
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- Definition Amount of estimated future accumulated cash outflow for costs to be incurred in producing proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 + Details
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