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Income Taxes (Reconciliation of Effective Income Tax Rate) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Income before provision for income taxes $ 1,173 $ 1,194
Statutory income tax rate 29.00% 29.00%
Income taxes, at statutory income tax rates $ 340 $ 346
Deferred income taxes on regulated income recorded as regulatory assets and regulatory liabilities (72) (70)
Tax credits (53) (18)
Foreign tax rate variance (36) (44)
Amortization of deferred income tax regulatory liabilities (33) (33)
Tax effect of equity earnings (15) (10)
GBPC impairment charge 0 21
Other (3) (7)
Income tax expense $ 128 $ 185
Effective income tax rate 11.00% 15.00%
Regulatory Liabilities $ 1,772 $ 2,273
Incremental tax benefits payable to customers [Member]    
Regulatory Liabilities $ 30 $ 9