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Acquisition and disposals - Identifiable assets acquired and liabilities assumed and analysis of cash flows on acquisition (Details) - USD ($)
$ in Millions
 1 Months Ended 6 Months Ended
Jan. 31, 2025
Jun. 30, 2025
Jun. 30, 2024
Mar. 06, 2025
Disclosure of detailed information about business combination [line items]        
Intangible assets       $ 2,200
Property, plant and equipment (including mineral interests)       5,500
Cash and cash equivalents       300
Borrowings       (1,600)
Close-down, restoration and environmental provisions       (300)
Other provisions       (400)
Other assets and liabilities       200
Deferred tax liabilities (net of deferred tax assets)       (1,100)
Net assets       4,800
Non-controlling interest (NCI)       (300)
Goodwill       1,800
Net attributable assets (including Goodwill)       $ 6,300
Cash payment in consideration of equity to shareholders of Arcadium Lithium plc   $ 6,300    
less: cash and cash equivalents balance acquired   (300)    
Acquisitions of subsidiaries, joint ventures and associates, net of cash acquired   $ 6,022 $ 0  
Arcadium Lithium Plc        
Disclosure of detailed information about business combination [line items]        
Loan advancement $ 200      
Arcadium Lithium Plc | Olaroz Lithium Carbonate Mine        
Disclosure of detailed information about business combination [line items]        
Non-wholly owned subsidiaries   66.50%    
Arcadium Lithium Plc | Nemaska Lithium Development Project        
Disclosure of detailed information about business combination [line items]        
Non-wholly owned subsidiaries   50.00%