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Accumulated Other Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 12,088 $ 11,441
Net current period OCI 956 (273)
Ending Balance 13,291 12,088
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 305 578
OCI before reclassifications 890 (232)
Amounts reclassified from AOCI 66 (41)
Net current period OCI 956 (273)
Ending Balance 1,261 305
Unrealized gain (loss) on translation of self-sustaining foreign operations    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 369 639
OCI before reclassifications 1,027 (270)
Amounts reclassified from AOCI 0 0
Net current period OCI 1,027 (270)
Ending Balance 1,396 369
Net change in net investment hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (24) (62)
OCI before reclassifications (139) 38
Amounts reclassified from AOCI 0 0
Net current period OCI (139) 38
Ending Balance (163) (24)
Gains (losses) on derivatives recognized as cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 14 16
OCI before reclassifications 0 0
Amounts reclassified from AOCI (2) (2)
Net current period OCI (2) (2)
Ending Balance 12 14
Net change on available-for-sale investments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (2) (2)
OCI before reclassifications 2 0
Amounts reclassified from AOCI 0 0
Net current period OCI 2 0
Ending Balance 0 (2)
Net change in unrecognized pension and post-retirement benefit costs    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (52) (13)
OCI before reclassifications 0 0
Amounts reclassified from AOCI 68 (39)
Net current period OCI 68 (39)
Ending Balance $ 16 $ (52)