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Accumulated Other Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance CAD 137 CAD (348)
Other comprehensive income (loss) before reclassifications 0 371
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 19 (114)
Other equity method reclassification adjustment (46) 0
Net current period other comprehensive income (loss) (27) 485
Other (4) 0
Ending Balance 106 137
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (35) (8)
Other comprehensive income (loss) before reclassifications 11 (34)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 11 (7)
Other equity method reclassification adjustment (8)  
Net current period other comprehensive income (loss) 14 (27)
Other 0 0
Ending Balance (21) (35)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (318) (425)
Other comprehensive income (loss) before reclassifications 0 0
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 12 (107)
Other equity method reclassification adjustment (3)  
Net current period other comprehensive income (loss) 9 107
Other 0 0
Ending Balance (309) (318)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 0 0
Other comprehensive income (loss) before reclassifications (49) 0
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 0 0
Other equity method reclassification adjustment 0  
Net current period other comprehensive income (loss) (49) 0
Other 0 0
Ending Balance (49) 0
Accumulated Net Available For Sale Securities Gain (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 0 3
Other comprehensive income (loss) before reclassifications 3 (3)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent (4) 0
Other equity method reclassification adjustment 0  
Net current period other comprehensive income (loss) (1) (3)
Other 0 0
Ending Balance (1) 0
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 490 82
Other comprehensive income (loss) before reclassifications 35 408
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 0 0
Other equity method reclassification adjustment (35)  
Net current period other comprehensive income (loss) 0 408
Other (4) 0
Ending Balance CAD 486 CAD 490