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Segments - Long Lived Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-Lived Assets $ 36,916 $ 33,538
Assets, Current 6,820 6,831
Investments in and advances to affiliates 1,030 1,124
Debt service reserves and other deposits 102 78
Goodwill 345 345
Other intangible assets, net of accumulated amortization of $480 and $426, respectively 2,016 1,947
Deferred Income Tax Assets, Net 404 365
Loans Receivable, Fair Value Disclosure 781 0
Other noncurrent assets, excluding ROU assets for operating leases 2,369 2,545
Noncurrent assets of held-for-sale businesses 0 633
Assets 50,783 47,406
Operating Segments [Member] | Renewables    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-Lived Assets 22,744 19,151
Operating Segments [Member] | Utilities    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-Lived Assets 9,093 8,535
Operating Segments [Member] | Energy Infrastructure    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-Lived Assets 5,029 5,805
Operating Segments [Member] | New Energy Technologies    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-Lived Assets 27 22
Operating Segments [Member] | Corporate Other And Other Eliminations [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-Lived Assets $ 23 $ 25