Supplemental Cash Flow Information - Cash Flow From Investing Activities (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Cash Flow Statement [Abstract]
Net proceeds from sale of steelmaking coal business	$ 9,483	$ 0
Proceeds from sale of Fort Hills	0	1,014
Proceeds from other assets	55	34
Proceeds from sale of discontinued operations and other assets	$ 9,538	$ 1,048

The cash inflow from the disposal of non-current assets or disposal groups classified as held for sale and discontinued operations. [Refer: Discontinued operations [member]; Disposal groups classified as held for sale [member]; Non-current assets or disposal groups classified as held for sale]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2024-01-01
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- Definition

The cash inflow from sales of long-term assets that the entity does not separately disclose in the same statement or note, classified as investing activities. [Refer: Assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-IssueDate 2024-01-01
-Paragraph 16
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- Definition

The cash inflow from sales of interests in associates. [Refer: Total for all associates [member]]

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- Definition

Cash Flow Statement [Abstract]

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- Definition

Net Proceeds From Divestiture of Businesses, Net of Cash Divested

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No definition available.

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