v3.24.0.1
Income taxes - Temporary differences (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of temporary differences      
Net income $ (57) $ (30) $ (19)
Balance at end of period 0    
Property, plant and equipment and intangible assets subject to amortization      
Reconciliation of temporary differences      
Balance at beginning of period (276) (316)  
Net income 35 32  
Other comprehensive income 0 8  
Foreign currency translation (3) 0  
Balance at end of period (327) (276) (316)
Acquired during the year & other (83)    
Net pension and share- based compensation amounts      
Reconciliation of temporary differences      
Balance at beginning of period 1 4  
Net income 2 (3)  
Other comprehensive income 0 0  
Foreign currency translation 0 0  
Balance at end of period 3 1 4
Acquired during the year & other 0    
Debt and equity issue costs      
Reconciliation of temporary differences      
Balance at beginning of period 6 8  
Net income (2) (2)  
Other comprehensive income 0 0  
Foreign currency translation 0 0  
Balance at end of period 4 6 8
Acquired during the year & other 0    
Provisions and other      
Reconciliation of temporary differences      
Balance at beginning of period 7 4  
Net income 4 9  
Other comprehensive income 4 (1)  
Foreign currency translation 0 (5)  
Balance at end of period 17 7 4
Acquired during the year & other 2    
Non-capital loss carried forward      
Reconciliation of temporary differences      
Balance at beginning of period 10 15  
Net income 16 (5)  
Other comprehensive income (2) 0  
Foreign currency translation 0 0  
Balance at end of period 38 10 15
Acquired during the year & other 14    
Leases      
Reconciliation of temporary differences      
Balance at beginning of period 2 3  
Net income 2 (1)  
Other comprehensive income 0 0  
Foreign currency translation 0 0  
Balance at end of period 4 2 3
Acquired during the year & other 0    
Net deferred income tax asset (liability)      
Reconciliation of temporary differences      
Balance at beginning of period (250) (282)  
Net income 57 30  
Other comprehensive income 2 7  
Foreign currency translation (3) (5)  
Balance at end of period (261) $ (250) $ (282)
Acquired during the year & other $ (67)