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Other reserves (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Balance at beginning of the period     $ 455 $ 286
Other comprehensive income (expense) $ (27) $ (16) (41) 86
Hedging losses transferred to cost of inventory     6  
Hedging gains transferred to cost of inventory       (72)
NOMOQ acquisition (note 8)     (1)  
Balance at end of the period 277 333 277 333
Other reserves        
Balance at beginning of the period     (5,657) (5,593)
Other comprehensive income (expense)     (35) 49
Hedging losses transferred to cost of inventory     6  
Hedging gains transferred to cost of inventory       (72)
NOMOQ acquisition (note 8)     (6)  
Balance at end of the period (5,692) (5,616) (5,692) (5,616)
Foreign currency translation reserve        
Balance at beginning of the period     (18) (28)
Other comprehensive income (expense)     7 2
Balance at end of the period (11) (26) (11) (26)
Cash flow hedges reserve        
Balance at beginning of the period     8 82
Other comprehensive income (expense)     (42) 47
Hedging losses transferred to cost of inventory     6  
Hedging gains transferred to cost of inventory       (72)
Balance at end of the period (28) 57 (28) 57
Other reserve        
Balance at beginning of the period     (5,647) (5,647)
NOMOQ acquisition (note 8)     (6)  
Balance at end of the period $ (5,653) $ (5,647) $ (5,653) $ (5,647)