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Operating costs (Tables)
 12 Months Ended
Dec. 31, 2018
Analysis of income and expense [abstract]  
Disclosure of operating costs
FOR THE YEAR ENDED DECEMBER 31
NOTE
2018

2017

Labour costs
 
 
 
 
Wages, salaries and related taxes and benefits
 
(4,274
)
(4,156
)
 
Post-employment benefit plans service cost (net of capitalized amounts)
24
(266
)
(242
)
 
Other labour costs (1)
 
(1,043
)
(1,056
)
Less:
 
 
 
 
Capitalized labour
 
1,093

1,043

Total labour costs
 
(4,490
)
(4,411
)
Cost of revenues (2)
 
(7,360
)
(7,014
)
Other operating costs (3)
 
(2,083
)
(2,050
)
Total operating costs
 
(13,933
)
(13,475
)
(1)
Other labour costs include contractor and outsourcing costs.
(2)
Cost of revenues includes costs of wireless devices and other equipment sold, network and content costs, and payments to other carriers.
(3)
Other operating costs include marketing, advertising and sales commission costs, bad debt expense, taxes other than income taxes, IT costs, professional service fees and rent.