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Short-Term Debt (Narrative) (Details)
$ in Millions, $ in Millions
Dec. 16, 2023
CAD ($)
Dec. 15, 2023
Dec. 01, 2023
USD ($)
Nov. 24, 2023
USD ($)
Jun. 30, 2023
CAD ($)
Jun. 29, 2023
Apr. 03, 2023
USD ($)
Mar. 01, 2023
USD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Line of Credit Facility [Line Items]                    
Weighted average interest rate                 5.95% 5.01%
Line of Credit Facility, Maximum Borrowing Capacity                 $ 2,773 $ 3,155
Revolving credit facility | TEC                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity                 401 1,084
Revolving credit facility | NMGC                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity                 165 169
Revolving credit facility | TECO Energy/TECO Finance                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity                 0 542
Revolving credit facility | TECO Finance                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity                 529 0
Revolving credit facility | Peoples Gas System [Member]                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity                 331 0
Revolving credit facility | Peoples Gas System [Member] | Gas Utilities and Infrastructure                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity     $ 250              
Line of Credit Facility, Expiration Date     Dec. 01, 2028              
Available increase in borrowing capacity     $ 100              
Revolving credit facility II | TEC                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity                 265 542
Revolving credit facility II | TEC | Florida Electric Utility [Member]                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity             $ 200      
Line of Credit Facility, Expiration Date             Apr. 01, 2024      
Debt term             364 days      
Revolving credit facility III | TEC                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity                 $ 265 $ 0
Revolving credit facility III | TEC | Florida Electric Utility [Member]                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity               $ 200    
Line of Credit Facility, Expiration Date               Feb. 28, 2024    
Debt term               364 days    
Non-revolving term facilities | TEC | Florida Electric Utility [Member]                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity       $ 400            
Line of Credit Facility, Expiration Date       Dec. 13, 2023            
Non-revolving term facilities | Emera Inc.                    
Line of Credit Facility [Line Items]                    
Weighted average interest rate                 6.07% 5.19%
Line of Credit Facility, Maximum Borrowing Capacity                 $ 400 $ 400
Non-revolving term facilities | Emera Inc. | Other Segments [Member]                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity $ 400                  
Debt Instrument, Maturity Date Dec. 16, 2024 Dec. 16, 2023                
Non-revolving term loan II | Emera Inc.                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity                 $ 400 $ 400
Non-revolving term loan II | Emera Inc. | Other Segments [Member]                    
Line of Credit Facility [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity         $ 400          
Debt Instrument, Maturity Date         Aug. 02, 2024 Aug. 02, 2023