XML 88 R122.htm IDEA: XBRL DOCUMENT
v3.20.1

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 |

X
- Definition Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Development Costs and Asset Retirement Obligations + References No definition available. + Details
Name: | cnq_FutureNetCashFlowsRelatingtoProvedOilandGasReservesDevelopmentCostsandAssetRetirementObligations
Namespace Prefix: | cnq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | srt_DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | srt_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | srt_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after future accumulated cash outflow for development and production costs and future income tax, 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
Name: | srt_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | srt_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of discount on future accumulated cash inflow, after deducting future accumulated cash outflow for development and production costs and future income tax, from sale of proved oil and gas reserves, using a discount rate of ten percent a year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 + Details
Name: | srt_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of discounted future accumulated cash inflow relating to 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
Name: | srt_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=srt_NorthAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=cnq_NorthSeaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=cnq_OffshoreAfricaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |