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Contract costs (Tables)
12 Months Ended
Dec. 31, 2021
Revenue From Contract With Customer1 [Abstract]  
Contract costs
The table below provides a reconciliation of the contract costs balance.
FOR THE YEAR ENDED DECEMBER 31 NOTE 2021 2020
Opening balance, January 1 764  783 
Incremental costs of obtaining a contract and contract fulfillment costs 635  535 
Amortization included in operating costs (504) (552)
Acquisitions 3  — 
Reclassified to assets held for sale 16  (4) — 
Discontinued operations 37    (2)
Ending balance, December 31 894  764