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Provisions and Other Liabilities - Summary of Movements in Provisions (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2018
CAD ($)
Disclosure of other provisions [line items]  
Provisions, beginning balance $ 2,038
Settled during the year (105)
Change in discount rate (409)
Change in amount and timing of cash flows 129
Accretion 103
Other (2)
Changes in foreign exchange rates 54
Provisions, ending balance 1,808
Less current portion of provisions (Note 18) (155)
Long-term provisions 1,653
Decommissioning and Restoration Provisions [member]  
Disclosure of other provisions [line items]  
Provisions, beginning balance 1,844
Settled during the year (76)
Change in discount rate (409)
Change in amount and timing of cash flows 111
Accretion 101
Other (2)
Changes in foreign exchange rates 45
Provisions, ending balance 1,614
Less current portion of provisions (Note 18) (91)
Long-term provisions 1,523
Other [member]  
Disclosure of other provisions [line items]  
Provisions, beginning balance 194
Settled during the year (29)
Change in amount and timing of cash flows 18
Accretion 2
Changes in foreign exchange rates 9
Provisions, ending balance 194
Less current portion of provisions (Note 18) (64)
Long-term provisions $ 130