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Accumulated Other Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 106 $ 137
Other comprehensive income (loss) before reclassifications (345) 0
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 51 19
Other equity method reclassification adjustment 0 (46)
Net current period other comprehensive income (loss) (294) (27)
Other 0 (4)
Ending Balance (188) 106
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (21) (35)
Other comprehensive income (loss) before reclassifications 10 11
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 8 11
Other equity method reclassification adjustment 0 (8)
Net current period other comprehensive income (loss) 18 14
Other 0 0
Ending Balance (3) (21)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (309) (318)
Other comprehensive income (loss) before reclassifications 0 0
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 44 12
Other equity method reclassification adjustment 0 (3)
Net current period other comprehensive income (loss) 44 9
Other 0 0
Ending Balance (265) (309)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (49) 0
Other comprehensive income (loss) before reclassifications 97 (49)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 0 0
Other equity method reclassification adjustment 0 0
Net current period other comprehensive income (loss) 97 (49)
Other 0 0
Ending Balance 48 (49)
Accumulated Net Available For Sale Securities Gain (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1) 0
Other comprehensive income (loss) before reclassifications 5 3
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (1) (4)
Other equity method reclassification adjustment 0 0
Net current period other comprehensive income (loss) 4 (1)
Other 0 0
Ending Balance 3 (1)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 486 490
Other comprehensive income (loss) before reclassifications (457) 35
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 0 0
Other equity method reclassification adjustment 0 (35)
Net current period other comprehensive income (loss) (457) 0
Other 0 (4)
Ending Balance $ 29 $ 486