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Segments - Depreciation, Amortization and Accretion, Capital Expenditures, Interest Income, Interest Expense and Net Equity in Earnings (Losses) of Affiliates (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Depreciation, amortization, and accretion of AROs $ 337   $ 318  
Capital Expenditures Total 1,261   2,155  
Interest income 69 $ 105 105  
Interest expense 342 357 357  
Net equity in losses of affiliates (34)   (15)  
Operating Segments [Member] | Renewables        
Segment Reporting Information [Line Items]        
Depreciation, amortization, and accretion of AROs 129   121  
Capital Expenditures Total 970   1,528  
Interest income 21     $ 31
Interest expense 131     92
Net equity in losses of affiliates (9)   1  
Operating Segments [Member] | Utilities        
Segment Reporting Information [Line Items]        
Depreciation, amortization, and accretion of AROs 124   111  
Capital Expenditures Total 260   448  
Interest income 2     3
Interest expense 77     73
Net equity in losses of affiliates 2   1  
Operating Segments [Member] | Energy Infrastructure        
Segment Reporting Information [Line Items]        
Depreciation, amortization, and accretion of AROs 81   84  
Capital Expenditures Total 28   165  
Interest income 41     65
Interest expense 74     134
Net equity in losses of affiliates 4   3  
Operating Segments [Member] | New Energy Technologies        
Segment Reporting Information [Line Items]        
Depreciation, amortization, and accretion of AROs 0   0  
Capital Expenditures Total 1   2  
Interest income 2 1    
Interest expense 0     0
Net equity in losses of affiliates (27)   (17)  
Corporate, Non-Segment | Corporate Other And Other        
Segment Reporting Information [Line Items]        
Depreciation, amortization, and accretion of AROs 3   2  
Capital Expenditures Total 2   12  
Interest income 3 $ 5    
Interest expense 60     $ 58
Net equity in losses of affiliates $ (4)   $ (3)