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Derivatives Instruments (Cash Flow Hedges Recorded in AOCI) (Details) - Cash flow hedges - Treasury lock - CAD ($) $ in Millions		12 Months Ended
	May 26, 2021	Dec. 31, 2024	Dec. 31, 2023
Cash Flow Hedges
Derivative gain loss amortization period	10 years
Total unrealized gain in AOCI - effective portion, net of tax	$ 19	$ 12	$ 14
Unrealized gains reclassified into interest expense		2	$ 2
Unrealized gains currently in AOCI to be reclassified into net income within the next twelve months		$ 2

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- Definition

Derivative gain loss amortization period in number of years.

+ References

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- Definition

Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-11

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480870/815-30-50-1

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- Definition

The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4C
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C

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