ACQUISITIONS, DIVESTITURES AND DISCONTINUED OPERATIONS - ACQUISITION ACTIVITY (Details) $ in Millions	Mar. 19, 2021 USD ($) MW	Dec. 31, 2020
Saavi Energia [Member] | ESJ [Member]
Business Acquisition [Line Items]
Percent ownership held by noncontrolling interests		50.00%
IEnova [Member] | Saavi Energia Asset Acquisition [Member] | Sempra Mexico [Member]
Business Acquisition [Line Items]
Purchase price	$ 65
Cash acquired	14
Debt assumed	277
Related party note payable assumed	$ 94
Subsequent acquisition, percentage	100.00%
Equity interest in acquiree, fair value	$ 34
Assets acquired	458
Liabilities assumed	$ 345
Power generation facility, nameplate capacity (in MW) | MW	155
Intangible assets acquired	$ 198
Intangible assets acquired, useful life	14 years
Second power generation facility, nameplate capacity (in MW) | MW	108
IEnova [Member] | ESJ [Member] | Sempra Mexico [Member]
Business Acquisition [Line Items]
Percent ownership held by noncontrolling interests		50.00%