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Other Liabilities and Provisions - Summary of Movements in Provisions (Detail)
CAD in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
CAD
Dec. 31, 2017
CAD
Disclosure of other provisions [line items]    
Provisions, beginning balance   CAD 1,307
Settled during the year   (49)
Change in discount rate CAD 36 210
Change in amount and timing of cash flows   527
Accretion   81
Other   (2)
Changes in foreign exchange rates   (36)
Provisions, ending balance 2,038 2,038
Less current portion of provisions (Note 17) (133) (133)
Long-term provisions 1,905 1,905
Decommissioning and Restoration Provisions [member]    
Disclosure of other provisions [line items]    
Provisions, beginning balance   1,220
Settled during the year   (39)
Change in discount rate   210
Change in amount and timing of cash flows   406
Accretion   81
Other   (2)
Changes in foreign exchange rates   (32)
Provisions, ending balance 1,844 1,844
Less current portion of provisions (Note 17) (83) (83)
Long-term provisions 1,761 1,761
Other [member]    
Disclosure of other provisions [line items]    
Provisions, beginning balance   87
Settled during the year   (10)
Change in amount and timing of cash flows   121
Changes in foreign exchange rates   (4)
Provisions, ending balance 194 194
Less current portion of provisions (Note 17) (50) (50)
Long-term provisions CAD 144 CAD 144