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Accumulated Other Comprehensive Income (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Non-regulated fuel for generation and purchased power $ 209 $ 313
Income (Loss) from Equity Method Investments 124 100
Operating, maintenance and general 1,399 1,137
Other Income (Expense) 2 174
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest 819 244
Income tax expense (recovery) 520 (22)
Net income 299 266
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net income 51 65
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest 7 11
Income tax expense (recovery) 1 0
Net income 8 11
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] | Power and Gas Swaps [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Non-regulated fuel for generation and purchased power (3) (2)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] | Interest Rate Swap [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income (Loss) from Equity Method Investments 0 1
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] | Foreign Exchange Forward [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Regulated 10 12
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest 43 15
Income tax expense (recovery) 1 (3)
Net income 44 12
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Operating, maintenance and general 40 41
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Operating, maintenance and general (8) (9)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Transition Including Portion Attributable to Noncontrolling Interest [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Pension and Other Postretirement Benefit Expense 11 (17)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Available For Sale Securities Gain Loss Including Portion Attributable To Noncontrolling Interest [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other Income (Expense) (1) (4)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest (1) (4)
Income tax expense (recovery) 0 0
Net income (1) (4)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Equity Method Investment, Realized Gain (Loss) on Disposal 0 54
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest 0 54
Income tax expense (recovery) 0 (8)
Net income $ 0 $ 46