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Net Other Operating (Income) Losses (Tables)
 12 Months Ended
Dec. 31, 2018
Analysis of income and expense [abstract]  
Disclosure of components of net other operating (income) losses
Net other operating expense (income) includes the following:
Year ended Dec. 31
2018

2017

2016

Alberta Off-Coal Agreement
(40
)
(40
)
—

Termination of the Sundance B and C PPAs
(157
)
—

—

Mississauga cogeneration facility NUG Contract
—

(9
)
(191
)
Insurance recoveries
(7
)
—

(3
)
Restructuring provision
—

—

1

Net other operating expense (income)
(204
)
(49
)
(193
)