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SIGNIFICANT TRANSACTIONS - Acquisition of Six Solar Power Plants Narrative (Details) - Solar Portfolio
$ in Millions
 1 Months Ended 6 Months Ended
May 26, 2026
USD ($)
solarPowerPlant
MW
Jun. 30, 2026
USD ($)
Jun. 30, 2026
USD ($)
Disclosure of detailed information about business combination [line items]      
Number of solar power plants acquired | solarPowerPlant 6    
Percentage of voting equity interests acquired 100.00%    
Revenue of acquiree since acquisition date   $ 2  
Profit (loss) of acquiree since acquisition date   1  
Revenue of combined entity as if combination occurred at beginning of period   9  
Profit (loss) of combined entity as if combination occurred at beginning of period   $ 4  
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination     $ 1
Kyivstar Group Ltd.      
Disclosure of detailed information about business combination [line items]      
Purchase consideration $ 70    
Contingent liabilities recognised as of acquisition date $ 11    
Acquired entities generation capacity | MW 105    
Useful life measured as period of time, property, plant and equipment 17 years    
Property and equipment $ 49    
Property, plant and equipment recognised as of acquisition date, fair value step-up 31    
Intangible assets $ 11    
Useful life measured as period of time, intangible assets other than goodwill 4 years    
Trade receivables and other assets $ 6    
Current liabilities 11    
Deferred tax assets 3    
Deferred tax liabilities recognised as of acquisition date $ 8