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Net Other Operating Income (Tables)
12 Months Ended
Dec. 31, 2020
Analysis of income and expense [abstract]  
Disclosure of components of net other operating (income) losses
Net other operating income includes the following:
Year ended Dec. 31202020192018
Coal supply agreement29 — — 
Alberta Off-Coal Agreement(40)(40)(40)
Insurance recoveries (10)(7)
Other expenses — 
Net other operating income(11)(49)(47)