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Leases (Narrative) (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
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 62 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.    
Lease, Expense $ 127 $ 138  
Variable costs for power generation facility finance leases $ 119 131  
Lessee, Operating Lease, Existence of Option to Extend [true false] true    
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 62 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, Lease, Description [Line Items]      
Net Investment in Lease $ 658 $ 638  
Renewable Natural Gas Facility [Member]      
Lessee, Lease, Description [Line Items]      
Lessor, sales-type lease, term of contract     15 years
Lessor Sales Type Lease Assumptions And Judgments Value Of Underlying Asset Amount     $ 35
Brunswick Pipeline Lease [Member]      
Lessee, Lease, Description [Line Items]      
Lessor, operating lease, term of contract 34 years    
Net Investment in Lease $ 100    
Lessor lease option to extend 16 years    
Minimum      
Lessee, Lease, Description [Line Items]      
Lessee, operating lease, renewal term 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Lessee, operating lease, renewal term 62 years