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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 8,358 $ 7,204
Net current period other comprehensive income (loss) [1] (244) 506
Ending Balance 8,601 8,358
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance [2] 338 (165)
Other comprehensive income (loss) before reclassifications (320) 504
Amounts reclassified from accumulated other comprehensive income loss 77 (1)
Net current period other comprehensive income (loss) [2] (243) 503
Ending Balance [2] 95 338
Unrealized (loss) gain on translation of self-sustaining foreign operations    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 654 30
Other comprehensive income (loss) before reclassifications (401) 624
Amounts reclassified from accumulated other comprehensive income loss 0 0
Net current period other comprehensive income (loss) (401) 624
Ending Balance 253 654
Net change in net investment hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (74) 48
Other comprehensive income (loss) before reclassifications 78 (122)
Amounts reclassified from accumulated other comprehensive income loss 0 0
Net current period other comprehensive income (loss) 78 (122)
Ending Balance 4 (74)
(Losses) gains on derivatives recognized as cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (7) (3)
Other comprehensive income (loss) before reclassifications 3 2
Amounts reclassified from accumulated other comprehensive income loss 3 (6)
Net current period other comprehensive income (loss) 6 (4)
Ending Balance (1) (7)
Net change on available-for-sale investments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1) 3
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income loss 0 (4)
Net current period other comprehensive income (loss) 0 (4)
Ending Balance (1) (1)
Net change in unrecognized pension and post-retirement benefit costs    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (234) (243)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income loss 74 9
Net current period other comprehensive income (loss) 74 9
Ending Balance $ (160) $ (234)
[1]
4) Net of tax expense of $10 million (2018 - $11 million tax recovery) for the year ended December 31, 2019.
[2]
(1) Accumulated Other Comprehensive Income (Loss) ("AOCI") ("AOCL")