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Segments - Financial Information by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Total Revenue $ 2,926   $ 3,085    
Total Adjusted EBITDA 613   632    
Interest expense (342) $ (357) (357)    
Interest income 69 105 105    
Depreciation, Amortization and Accretion, Net (337)   (318)    
Adjustment for noncontrolling interests and redeemable stock of subsidiaries 134   164    
Less: Income taxes expense (benefit), interest expense (income) and depreciation and amortization from equity affiliates (36)   (34)    
Interest income recognized under service concession arrangements (15)   (17)    
Unrealized derivative and equity securities losses (gains) 1   85    
Foreign Currency Transaction Gain (Loss), Unrealized 7   9    
Disposition/ acquisition losses (41)   43    
Impairment losses (33)   (26)    
Extinguishment of Debt, Gain (Loss), Net of Tax (8)   (32)   $ 3
Restructuring Costs (46)        
Income from continuing operations before taxes (56)   262    
Corporate Other And Other          
Segment Reporting Information [Line Items]          
Reconciliation to income from continuing operations before taxes (24)   8    
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Total Revenue 2,995   3,125    
Operating Segments [Member] | Renewables          
Segment Reporting Information [Line Items]          
Total Revenue 666   643    
Total cost of sales excluding depreciation, amortization, and accretion of AROs (1) 466   459    
Segment Reporting, Other Segment Item, Amount 39   73    
Total Adjusted EBITDA 161   111    
Interest expense (131)     $ (92)  
Interest income 21     31  
Operating Segments [Member] | Utilities          
Segment Reporting Information [Line Items]          
Total Revenue 1,009   873    
Total cost of sales excluding depreciation, amortization, and accretion of AROs (1) 730   642    
Segment Reporting, Other Segment Item, Amount 56   49    
Total Adjusted EBITDA 223   182    
Interest expense (77)     (73)  
Interest income 2     3  
Operating Segments [Member] | Energy Infrastructure          
Segment Reporting Information [Line Items]          
Total Revenue 1,320   1,609    
Total cost of sales excluding depreciation, amortization, and accretion of AROs (1) 1,050   1,132    
Segment Reporting, Other Segment Item, Amount 16   121    
Total Adjusted EBITDA 254   356    
Interest expense (74)     (134)  
Interest income 41     65  
Operating Segments [Member] | New Energy Technologies          
Segment Reporting Information [Line Items]          
Total Revenue 0   0    
Total cost of sales excluding depreciation, amortization, and accretion of AROs (1) (1)   1    
Segment Reporting, Other Segment Item, Amount 26   16    
Total Adjusted EBITDA (25)   (17)    
Interest expense 0     $ 0  
Interest income 2 $ 1      
Operating Segments [Member] | Corporate Other And Other          
Segment Reporting Information [Line Items]          
Total Revenue 36   33    
Intersegment Eliminations [Member]          
Segment Reporting Information [Line Items]          
Total Revenue (105)   (73)    
Segment Reporting, Other Segment Item, Amount $ 2   $ 0