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Accumulated Other Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 10,150 $ 9,238
Net current period other comprehensive income (loss) 553 104
Ending Balance 11,441 10,150
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 25 (79)
Other comprehensive income (loss) before reclassifications 531 (19)
Amounts reclassified from accumulated other comprehensive income loss 22 123
Net current period other comprehensive income (loss) 553 104
Ending Balance 578 25
Unrealized gain (loss) on translation of self-sustaining foreign operations    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 10 52
Other comprehensive income (loss) before reclassifications 629 (42)
Amounts reclassified from accumulated other comprehensive income loss 0 0
Net current period other comprehensive income (loss) 629 (42)
Ending Balance 639 10
Net change in net investment hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 35 30
Other comprehensive income (loss) before reclassifications (97) 5
Amounts reclassified from accumulated other comprehensive income loss 0 0
Net current period other comprehensive income (loss) (97) 5
Ending Balance (62) 35
(Losses) gains on derivatives recognized as cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 18 1
Other comprehensive income (loss) before reclassifications 0 18
Amounts reclassified from accumulated other comprehensive income loss (2) (1)
Net current period other comprehensive income (loss) (2) 17
Ending Balance 16 18
Net change on available-for-sale investments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (1) (1)
Other comprehensive income (loss) before reclassifications (1) 0
Amounts reclassified from accumulated other comprehensive income loss 0 0
Net current period other comprehensive income (loss) (1) 0
Ending Balance (2) (1)
Net change in unrecognized pension and post-retirement benefit costs    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (37) (161)
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income loss 24 124
Net current period other comprehensive income (loss) 24 124
Ending Balance $ (13) $ (37)