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Other expense (Tables)
 12 Months Ended
Dec. 31, 2018
Analysis of income and expense [abstract]  
Schedule of other expense
FOR THE YEAR ENDED DECEMBER 31
NOTE
2018

2017

Impairment of assets
15,
16
(200
)
(82
)
Net mark-to-market (losses) gains on derivatives used to economically hedge equity settled share-based compensation plans (1)
 
 
 
(80
)
76

Equity losses from investments in associates and joint ventures
 
17
 
 
 
Loss on investment
 
 
(20
)
(22
)
 
Operations
 
 
(15
)
(9
)
Loss on investments
 
 
(34
)
(5
)
Early debt redemption costs
 
22
(20
)
(20
)
Gains (losses) on retirements and disposals of property, plant and equipment and intangible assets

 
 
11

(47
)
Other (1)
 
 
10

7

Total other expense
 
 
(348
)
(102
)

(1) We have reclassified amounts from the previous period to make them consistent with the presentation for the current period.