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Provisions (Tables)
12 Months Ended
Dec. 31, 2020
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]  
Disclosure of other provisions
FOR THE YEAR ENDED DECEMBER 31 NOTE AROs
Other (1)
Total
January 1, 2020 199  132  331 
Additions 21  95  116 
Usage (8) (20) (28)
Reversals (1) (1) (2)
Discontinued operations 3 (9)   (9)
December 31, 2020 202  206  408 
Current 22 15  38  53 
Non-current 27 187  168  355 
December 31, 2020 202  206  408 
(1) Other includes environmental, legal, vacant space and other provisions.