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Cash and Cash Equivalents - Schedule Representing Cash and Cash Equivalents (Detail) - CAD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Cash	$ 368	$ 108
Short-Term Investments	10	78
Total	$ 378	$ 186	$ 781	$ 610

X

- Definition

The amount of cash balances held at banks.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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No definition available.

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- Definition

A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents]

+ References

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