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Segments and Geographic Information Segment and Geographic Information (Adjusted EBITDA & Reconcilliation of Net Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Jun. 30, 2024
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reconciliation To Income From Continuing Operations Before Taxes              
Net equity in losses of affiliates $ (9) $ 3 $ (12) $ (21) $ (26) $ (32) $ (71)
Net income (loss) 215 153 431 646 802 (182) (505)
Income Tax Expense (Benefit) 103 (35) (51) 52 59 261 265
Interest expense (379) (389) (746) (1,125) (1,485) (1,319) (1,117)
Investment Income, Interest (119) $ (88) (193) (312) (381) (551) (389)
Depreciation, Amortization and Accretion, Net         (1,264) (1,147) (1,072)
Depreciation, amortization, and accretion of AROs     $ 620 926 1,264 1,147 1,072
Adjustment for noncontrolling interests and redeemable stock of subsidiaries         734 556 707
Less: Income taxes expense (benefit), interest expense (income) and depreciation and amortization from equity affiliates         (136) (131) (128)
Interest income recognized under service concession arrangements         (65) (71) (77)
Unrealized derivative and equity securities losses (gains)         94 (34) (131)
Disposition/ acquisition losses         323 79 (40)
Impairment losses         (280) (877) (1,658)
Extinguishment of Debt, Gain (Loss), Net of Tax         (57) (62) (20)
Income (loss) from continuing operations, net of tax $ 511     $ 1,219 1,686 242 (546)
Total Adjusted EBITDA         2,672 2,808 2,955
Unrealized Gain (Loss), Foreign Currency Transaction, before Tax         (16) (301) (42)
Depreciation expense         1,146 1,045 982
Accretion Expense, Including Asset Retirement Obligations         22 16 18
Operating Segments | Renewables              
Reconciliation To Income From Continuing Operations Before Taxes              
Net equity in losses of affiliates         19 41 28
Interest expense         (414) (326) (236)
Investment Income, Interest         (109) (181) (131)
Depreciation, amortization, and accretion of AROs         401 345 268
Total Adjusted EBITDA         552 652 613
Total cost of sales excluding depreciation, amortization, and accretion of AROs (1)         1,752 1,504 1,097
Segment Reporting, Other Segment Item, Amount         206 183 183
Operating Segments | Utilities              
Reconciliation To Income From Continuing Operations Before Taxes              
Net equity in losses of affiliates         4 5 6
Interest expense         (294) (243) (234)
Investment Income, Interest         (12) (12) (8)
Depreciation, amortization, and accretion of AROs         458 400 376
Total Adjusted EBITDA         792 678 612
Total cost of sales excluding depreciation, amortization, and accretion of AROs (1)         2,607 2,662 2,861
Segment Reporting, Other Segment Item, Amount         209 155 144
Operating Segments | Energy Infrastructure              
Reconciliation To Income From Continuing Operations Before Taxes              
Net equity in losses of affiliates         10 6 9
Interest expense         (483) (534) (488)
Investment Income, Interest         (233) (337) (246)
Depreciation, amortization, and accretion of AROs         397 392 416
Total Adjusted EBITDA         1,366 1,540 1,846
Total cost of sales excluding depreciation, amortization, and accretion of AROs (1)         4,568 5,022 5,249
Segment Reporting, Other Segment Item, Amount         304 274 109
Intersegment Eliminations              
Reconciliation To Income From Continuing Operations Before Taxes              
Segment Reporting, Other Segment Item, Amount         (44) (2) 13
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Corporate and Other              
Reconciliation To Income From Continuing Operations Before Taxes              
Net equity in losses of affiliates         (39) 0 0
Interest expense         (294) (216) (159)
Investment Income, Interest         (20) (19) (4)
Depreciation, amortization, and accretion of AROs         $ 7 $ 9 $ 10