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Summary of Significant Accounting and Reporting Policies (Goodwill and Intangible Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets [Line Items]      
Goodwill $ 4,254 $ 4,204  
Other intangible assets not subject to amortization, primarily land easements 135 135  
Other intangible assets:      
Total 619 473  
Accumulated amortization (61) (56)  
Total other intangible assets subject to amortization - net 558 417  
Intangible assets, amortization [Abstract]      
Amortization expense 27 18 $ 19
Amortization Expense 2021 32    
Amortization Expense 2022 17    
Amortization Expense 2023 16    
Amortization Expense 2024 18    
Amortization Expense 2025 $ 17    
Purchased Power Agreements [Member]      
Other intangible assets:      
Weighted average useful lives (years) 14 years    
Total $ 453 401  
Other, primarily transmission and development rights and customer lists [Member]      
Other intangible assets:      
Weighted average useful lives (years) 17 years    
Total $ 166 72  
Rate-Regulated Transmission [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill 614 610  
Gas Infrastructure, primarily Texas pipelines [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill 487 487  
Customer Supply [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill 93 93  
Generation Assets [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill 60 28  
Other Goodwill Assets [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill 11 0  
FPL[Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill 301 300  
FPL[Member] | Florida City Gas [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill 292 291  
FPL[Member] | Other Goodwill Assets [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill 9 9  
Gulf Power [Member] | Other Goodwill Assets [Member]      
Goodwill and Intangible Assets [Line Items]      
Goodwill $ 2,688 $ 2,686