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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2021
Earnings per share [abstract]  
Schedule of the reconciliations of the denominators of the basic and diluted per share computations
Years Ended December 31
(millions except earnings per share)		202120202019
Net income$78 $103 $69 
Weighted average number of equity shares outstanding264 224 190 
Basic earnings per share$0.30 $0.46 $0.36 
Years Ended December 31
(millions except earnings per share)		202120202019
Net income$78 $103 $69 
Weighted average number of equity shares outstanding264 224 190 
Dilutive effect of share-based compensation3 2 — 
Weighted average number of diluted equity shares outstanding267226190
Diluted earnings per share$0.29 $0.46 $0.36