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Leases (Narrative) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
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 63 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 that they will be exercised.  
Lease, Expense $ 138 $ 150
Variable costs for power generation facility finance leases $ 131 142
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 63 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 that they will be exercised  
Lessee, Lease, Description [Line Items]    
Net Investment in Lease $ 638 $ 522
Lessor lease option to extend 65 years  
Brunswick Pipeline Lease [Member]    
Lessee, Lease, Description [Line Items]    
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 63 years