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Leases (Narrative) (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Oct. 31, 2023
USD ($)
Lessee, Operating Leases      
Lessee, Operating Lease, Description The Company has operating leases for buildings, land, telecommunication services, and rail cars. Emera’s leases have remaining lease terms of 1 year to 61 years, some of which include options to extend the leases for up to 65 years. These options are included as part of the lease term when it is considered reasonably certain they will be exercised.    
Lessee, Operating Lease, Option to Extend The Company has operating leases for buildings, land, telecommunication services, and rail cars. Emera’s leases have remaining lease terms of 1 year to 61 years, some of which include options to extend the leases for up to 65 years. These options are included as part of the lease term when it is considered reasonably certain they will be exercised    
Lessee, Operating Lease, Existence of Option to Extend [true false] true    
Lease, Expense $ 123 $ 127  
Variable costs for power generation facility finance leases $ 112 $ 119  
Renewable Natural Gas Facility [Member]      
Lessor, Direct finance and sales-type leases      
Lessor, sales-type lease, term of contract     15 years
Lessor Sales Type Lease Assumptions And Judgments Value Of Underlying Asset Amount     $ 35
Minimum      
Lessee, Operating Leases      
Lessee, Operating Lease, Remaining Lease Term 1 year    
Maximum      
Lessee, Operating Leases      
Lessee, Operating Lease, Remaining Lease Term 61 years    
Lessee, Operating Lease, Renewal Term 65 years