XML 149 R121.htm IDEA: XBRL DOCUMENT v3.22.1

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
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

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: