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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 8,601 $ 8,358
Net current period other comprehensive income (loss) [1] (174) (244)
Ending Balance 9,238 8,601
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance [2] 95 338
Other comprehensive income (loss) before reclassifications (175) (320)
Amounts reclassified from accumulated other comprehensive income loss 1 77
Net current period other comprehensive income (loss) [2] (174) (243)
Ending Balance [2] (79) 95
Unrealized (loss) gain on translation of self-sustaining foreign operations    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 253 654
Other comprehensive income (loss) before reclassifications (201) (401)
Amounts reclassified from accumulated other comprehensive income loss 0 0
Net current period other comprehensive income (loss) (201) (401)
Ending Balance 52 253
Net change in net investment hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 4 (74)
Other comprehensive income (loss) before reclassifications 26 78
Amounts reclassified from accumulated other comprehensive income loss 0 0
Net current period other comprehensive income (loss) 26 78
Ending Balance 30 4
(Losses) gains on derivatives recognized as cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1) (7)
Other comprehensive income (loss) before reclassifications 0 3
Amounts reclassified from accumulated other comprehensive income loss 2 3
Net current period other comprehensive income (loss) 2 6
Ending Balance 1 (1)
Net change on available-for-sale investments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1) (1)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income loss 0 0
Net current period other comprehensive income (loss) 0 0
Ending Balance (1) (1)
Net change in unrecognized pension and post-retirement benefit costs    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (160) (234)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income loss (1) 74
Net current period other comprehensive income (loss) (1) 74
Ending Balance $ (161) $ (160)
[1]
5) Net of tax expense of $2 million (2019 - $10 million expense) for the year ended December 31, 2020.
[2]
(1) Accumulated Other Comprehensive Income (Loss) ("AOCI") ("AOCL")