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Summary of Significant Accounting and Reporting Policies (Goodwill and Intangible Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill and Intangible Assets [Line Items]      
Goodwill $ 4,866 $ 5,091  
Other intangible assets not subject to amortization, primarily land easements 137 136  
Other intangible assets:      
Total 1,780 1,706  
Accumulated amortization (202) (150)  
Total other intangible assets subject to amortization - net 1,578 1,556  
Intangible assets, amortization [Abstract]      
Amortization expense 62 58 $ 18
Amortization Expense Year 1 55    
Amortization Expense Year 2 54    
Amortization Expense Year 3 50    
Amortization Expense Year 4 46    
Amortization Expense Year 5 $ 45    
Purchased Power Agreements [Member]      
Other intangible assets:      
Weighted average useful lives (years) 17 years    
Total $ 633 988  
Biogas Rights Agreements      
Other intangible assets:      
Weighted average useful lives (years) 28 years    
Total $ 933 531  
Other, primarily transportation contracts and customer lists [Member]      
Other intangible assets:      
Weighted average useful lives (years) 19 years    
Total $ 214 187  
Rate-Regulated Assets [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill 1,167 1,218  
Gas Infrastructure [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill 0 487  
Clean Energy Assets [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill 424 315  
Customer Supply [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill 299 95  
Corporate and Other [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill 11 11  
FPL [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill $ 2,965 $ 2,965