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Net finance expense/(income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net finance expense/(income)        
Senior Secured Green and Senior Green Notes $ 33 $ 25 $ 66 $ 48
Net pension interest costs 1 1 2 2
(Gains)/losses on derivative financial instruments (1)   3  
Foreign currency translation losses 2 3 4 4
Other net finance expense 14 5 24 8
Net finance expense before exceptional items 49 34 99 62
Exceptional finance income (note 5) (26) (74) (53) (125)
Net finance expense/(income) $ 23 $ (40) $ 46 $ (63)