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Segments - Financial Information by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Total Revenue $ 3,351 $ 3,289 $ 9,132 $ 9,316
Total Adjusted EBITDA 834 720 2,120 2,009
Interest expense (348) (379) (1,042) (1,125)
Interest income 76 119 215 312
Depreciation, Amortization and Accretion, Net (365) (312) (1,056) (945)
Adjustment for noncontrolling interests and redeemable stock of subsidiaries 238 233 625 579
Less: Income taxes expense (benefit), interest expense (income) and depreciation and amortization from equity affiliates (39) (31) (120) (93)
Interest income recognized under service concession arrangements (15) (16) (44) (49)
Unrealized derivative and equity securities losses (gains) 20 47 (112) 185
Foreign Currency Transaction Gain (Loss), Unrealized (2) (7) 1 (10)
Disposition/ acquisition losses (5) 11 (172) (8)
Impairment losses (61) (37) (7) (86)
Extinguishment of Debt, Gain (Loss), Net of Tax (1) (1) (13) (51)
Restructuring Costs     (88)  
Income from continuing operations before taxes 328 325 289 705
Corporate Other And Other        
Segment Reporting Information [Line Items]        
Reconciliation to income from continuing operations before taxes (10) (23) (23) (3)
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total Revenue 3,405 3,330 9,304 9,432
Operating Segments [Member] | Renewables        
Segment Reporting Information [Line Items]        
Total Revenue 817 754 2,127 2,016
Total cost of sales excluding depreciation, amortization, and accretion of AROs (1) 458 462 1,346 1,326
Segment Reporting, Other Segment Item, Amount 63 78 84 211
Total Adjusted EBITDA 296 214 697 479
Interest expense (123) (99) (373) (309)
Interest income 26 30 67 90
Operating Segments [Member] | Utilities        
Segment Reporting Information [Line Items]        
Total Revenue 1,105 961 3,068 2,730
Total cost of sales excluding depreciation, amortization, and accretion of AROs (1) 775 678 2,192 1,947
Segment Reporting, Other Segment Item, Amount 90 60 217 164
Total Adjusted EBITDA 240 223 659 619
Interest expense (72) (75) (226) (223)
Interest income 2 2 8 9
Operating Segments [Member] | Energy Infrastructure        
Segment Reporting Information [Line Items]        
Total Revenue 1,483 1,614 4,109 4,685
Total cost of sales excluding depreciation, amortization, and accretion of AROs (1) 1,110 1,183 3,208 3,433
Segment Reporting, Other Segment Item, Amount 72 141 92 303
Total Adjusted EBITDA 301 290 809 949
Interest expense (71) (120) (221) (381)
Interest income 39 80 121 193
Operating Segments [Member] | New Energy Technologies        
Segment Reporting Information [Line Items]        
Total Revenue 0 1 0 1
Total cost of sales excluding depreciation, amortization, and accretion of AROs (1) 3 1 6 5
Segment Reporting, Other Segment Item, Amount 0 7 39 34
Total Adjusted EBITDA (3) (7) (45) (38)
Interest expense 0 0 0 0
Interest income 2 2 6 5
Operating Segments [Member] | Corporate Other And Other        
Segment Reporting Information [Line Items]        
Total Revenue 32 33 111 106
Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Total Revenue (86) (74) (283) (222)
Segment Reporting, Other Segment Item, Amount $ 6 $ 1 $ 5 $ (10)