REVENUES - Other Revenues (Details)	3 Months Ended
	Mar. 31, 2018
Sempra Renewables [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Operating lease term	15 years
Sempra Renewables [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Operating lease term	25 years
Sempra Mexico [Member] | Minimum [Member]
Lessee, Lease, Description [Line Items]
Operating lease term	15 years
Sempra Mexico [Member] | Maximum [Member]
Lessee, Lease, Description [Line Items]
Operating lease term	25 years