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Net Interest Expense
 12 Months Ended
Dec. 31, 2017
Net Interest Expense [Abstract]  
Net interest expense
Net Interest Expense
The components of net interest expense are as follows: 
Year ended Dec. 31
2017

2016

2015

Interest on debt
218

218

218

Interest income
(7
)
(2
)
(2
)
Capitalized interest (Note 16)
(9
)
(16
)
(9
)
Loss on redemption of bonds (Note 4(F))
6

1

—

Interest on finance lease obligations
3

3

4

Credit facility fees, bank charges, and other interest

18

19

10

Keephills 1 outage interest accruals (reversals) (Note 4)
—

(10
)
9

Other
(3
)
(4
)
—

Accretion of provisions (Note 20)
21

20

21

Net interest expense
247

229

251