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Defined Benefit Obligation and Other Long-Term Liabilities (Notes)
 12 Months Ended
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]  
Defined Benefit Obligation and Other Long-Term Liabilities Defined Benefit Obligation and Other Long-Term Liabilities
The components of defined benefit obligation and other long-term liabilities are as follows:
As at Dec. 3120192018
Defined benefit obligation (Note 30)268  227  
Long-term incentive accruals (Note 29)4  9  
Other29  51  
Total301  287