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Salaries and benefits (Tables)
 12 Months Ended
Dec. 31, 2021
Classes of employee benefits expense [abstract]  
Schedule of employee benefit expenses
Years Ended December 31 (millions)Note202120202019
Wages and salaries$1,133 $879 $566 
Benefits82 65 49 
Pensions—defined contribution207 3 2 
$1,222 $947 $617