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Acquisitions and divestitures - Fair values of asstes and liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Jun. 22, 2022
Dec. 31, 2021
Jun. 22, 2021
Dec. 31, 2020
Dec. 31, 2019
Acquired assets            
Cash and cash equivalents $ (4,736)   $ (11,721)   $ (13,487) $ (7,350)
Property, plant and equipment, fair value adjustments $ 916          
Nacala Corridor Holding [Member] | Discontinued operations [member]            
Acquired assets            
Cash and cash equivalents   $ 172        
Inventory, recoverable tax, and other assets   423        
Intangible   2,219        
Property, plant, and equipment   1,363        
Assumed liabilities   (158)        
Net identifiable assets acquired   4,019        
Fair Value Adjustments, Recognised As Of Acquisition Date [1]   1,590        
Total identifiable net assets at fair value   2,429        
Pre-existing relation (Loans receivable from NLC)   859        
Loss on pre-existing relation   (771)        
Total identifiable net assets at fair value   2,517   $ 2,517    
Cash consideration   2,517        
Cash and cash equivalents   (172)        
Net cash outflow   $ 2,345        
Property, plant and equipment, fair value adjustments       441    
Intangible assets, fair value adjustments       $ 791    
[1] Of this amount, US$441 was allocated to property, plant, and equipment and US$791 was allocated to intangible and the remaining amount was allocated to other assets.