v3.26.1
Exceptional Items - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Apr. 02, 2024
Oct. 18, 2023
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Disclosure of exceptional items [line items]          
Exceptional items net     $ 3,371.0 $ 1,138.0 $ 5,763.0
Asset Impairment Loss     2,408.0 261.0  
Exceptional items gross     3,371.0 1,234.0 6,600.0
Impairment reversals of non-current assets     2.0 90.0  
Impairment of Western Australia Nickel assets [member]          
Disclosure of exceptional items [line items]          
Exceptional items net         2,675.0
Asset Impairment Loss         3,800.0
Exceptional items gross         3,800.0
Jansen Project [Member]          
Disclosure of exceptional items [line items]          
Asset Impairment Loss     2,300.0    
Samarco dam failure          
Disclosure of exceptional items [line items]          
Exceptional items net     1,071.0 [1] 914.0 [2] 3,762.0 [3]
Exceptional items gross     1,071.0 914.0 3,677.0
Western Australia Nickel (WAN) temporary suspension [member]          
Disclosure of exceptional items [line items]          
Exceptional items net       224.0  
Exceptional items gross       320.0  
Employee redundancies inventory write off and other suspension costs       410.0  
Impairment reversals of non-current assets       90.0  
Blackwater and Daunia gain on divestment [member]          
Disclosure of exceptional items [line items]          
Exceptional items net         (674.0)
Exceptional items gross         (877.0)
Cash flows from losing control of subsidiaries or other businesses, classified as investing activities $ 2,000.0        
Proceeds from divestiture of interest in a subsidiary towards preliminary completion adjustment 44.1        
Deferred consideration $ 1,100.0   48.0 $ 280.0  
Proportion of ownership interest in joint venture 50.00%        
Bma percentage basis 100.00%        
Deposit on signing of the asset sale agreement   $ 100.0      
Deferred consideration term 3 years        
Price linked earnout amount receivable term 3 years        
Price linked earnout subject to cap value $ 350.0        
Average realized pricing exeeding agreed thresholds term 3 years        
Portion of consideration paid (received) consisting of cash and cash equivalents $ 4,100.0       $ 1,072.0
Deferred and contingent consideration received     $ 1,000.0    
Blackwater and Daunia gain on divestment [member] | Top of range [member]          
Disclosure of exceptional items [line items]          
Deferred Price linked earnout consideration receivable on divestiture of interest in a subsidiary $ 900.0        
[1] Refer to note 4 'Significant events – Samarco dam failure' for further information.
[2] Refer to note 4 'Significant events – Samarco dam failure' for further information.
[3] Refer to note 4 'Significant events – Samarco dam failure' for further information.