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Acquisitions and divestitures - (Details 2) - USD ($)
$ in Millions
Dec. 31, 2024
Aug. 13, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Identifiable assets acquired          
Cash and cash equivalents $ 4,953   $ 3,609 $ 4,736 $ 11,721
Property, plant and equipment 39,984   48,396 $ 44,938  
Liabilities assumed          
Loans and borrowings $ 14,792   $ 12,471    
Alianca Energia [Member]          
Identifiable assets acquired          
Cash and cash equivalents   $ 95      
Intangible   828      
Property, plant and equipment   573      
Other   40      
Total Identifiable assets acquired    1,536      
Liabilities assumed          
Loans and borrowings   245      
Deferred taxes on profit   312      
Other   140      
Total Liabilities assumed    697      
Net assets acquired   839      
Consideration transferred for acquisition of the 45% equity interest held by Cemig GT   493      
Fair value of the 55% stake previously held by Vale   603      
Total [A]   1,096      
Fair value of net assets acquired   1,096      
(-) Deferred tax liability on the difference between the fair value and the book value of net assets   (257)      
Total net assets [B]   839      
Goodwill [A-B]   $ 257