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Employee Benefit Plans (Benefit Cost Components) (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Service Cost $ 51,000,000 $ 49,000,000
Defined Benefit Plan, Interest Cost 95,000,000 99,000,000
Defined Benefit Plan, Expected Return on Plan Assets 138,000,000 129,000,000
Defined Benefit Plan, Amortization of Gains (Losses) (33,000,000) (38,000,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (1,000,000) 0
Current year amortization of regulatory asset liabilities 26,000,000 17,000,000
Settlement, curtailment 4,000,000 (1,000,000)
Net Periodic Benefit Cost, Total 70,000,000 73,000,000
Non-pension Benefit Plans [Member    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Service Cost 6,000,000 5,000,000
Defined Benefit Plan, Interest Cost 13,000,000 14,000,000
Defined Benefit Plan, Expected Return on Plan Assets 2,000,000 3,000,000
Defined Benefit Plan, Amortization of Gains (Losses) 1,000,000 (2,000,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 0 (8,000,000)
Current year amortization of regulatory asset liabilities (2,000,000) (1,000,000)
Settlement, curtailment 0 0
Net Periodic Benefit Cost, Total $ 14,000,000 $ 9,000,000