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Intangibles - (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Balance at beginning of year $ 11,631 $ 10,238
Additions 519 1,072
Disposals (15) (14)
Amortization (324) (292)
Transfer to held for sale   (69)
Translation adjustment (2,382) 696
Acquisition of Alianca Energia 1,085  
Balance at end of year 10,514 11,631
Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Cost 12,595 13,866
Accumulated depreciation, amortisation and impairment [member]    
IfrsStatementLineItems [Line Items]    
Accumulated amortization (2,081) (2,235)
Goodwill [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning of year 3,263 3,189
Transfer to held for sale   (68)
Translation adjustment (482) 142
Acquisition of Alianca Energia 257  
Balance at end of year 3,038 3,263
Goodwill [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Cost 3,038 3,263
Concession [Member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning of year 7,689 6,434
Additions 465 1,013
Disposals (10) (14)
Amortization (270) (251)
Translation adjustment (1,756) 507
Acquisition of Alianca Energia 824  
Balance at end of year 6,942 7,689
Concession [Member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Cost 8,528 9,394
Concession [Member] | Accumulated depreciation, amortisation and impairment [member]    
IfrsStatementLineItems [Line Items]    
Accumulated amortization (1,586) (1,705)
Computer software [member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning of year 104 87
Additions 54 53
Amortization (54) (41)
Transfer to held for sale   (1)
Translation adjustment (20) 6
Balance at end of year 84 104
Computer software [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Cost 579 634
Computer software [member] | Accumulated depreciation, amortisation and impairment [member]    
IfrsStatementLineItems [Line Items]    
Accumulated amortization (495) (530)
Research And Development Project And Patents [Member]    
IfrsStatementLineItems [Line Items]    
Balance at beginning of year 575 528
Additions   6
Disposals (5)  
Translation adjustment (124) 41
Acquisition of Alianca Energia 4  
Balance at end of year 450 575
Research And Development Project And Patents [Member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Cost $ 450 $ 575