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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 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 + Details
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