XML 82 R54.htm IDEA: XBRL DOCUMENT v3.10.0.1
Inventory (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of inventories [Abstract]  
Disclosure Of The Components Of Inventories
The components of inventory are as follows:
As at Dec. 31
2018

2017

Parts and materials
113

118

Coal
108

58

Deferred stripping costs
7

11

Natural gas
4

9

Purchased emission credits
10

23

Total
242

219
Disclosure Of The Change In Inventory
The change in inventory is as follows:
Balance, Dec. 31, 2016
213

Net addition
11

Change in foreign exchange rates
(5
)
Balance, Dec. 31, 2017
219

Net addition
20

Change in foreign exchange rates
3

Balance, Dec. 31, 2018
242