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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - NONCONTROLLING INTERESTS (Details) $ / shares in Units, MXN in Millions, $ in Millions			1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 13, 2016 USD ($) $ / shares MXN / $ shares	Oct. 13, 2016 MXN shares	Dec. 31, 2016 USD ($) facility	Dec. 31, 2017 USD ($) company facility	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 19, 2016	Oct. 18, 2016
Noncontrolling Interest [Line Items]
Impact of issuance on equity					$ 196	$ 1,701
IEnova [Member]
Noncontrolling Interest [Line Items]
Price of shares issued (in pesos per share) \| $ / shares	$ 80.00
Additional shares purchased \| shares	83,125,000
Cash consideration (fair value of total consideration)	$ 351
Shares issued \| shares	380,000,000	380,000,000
Proceeds from sale of shares	$ 1,570	MXN 29,860
Exchange rate (in pesos) \| MXN / $	18.96
Ownership interest							66.40%	81.10%
IEnova [Member] \| Bridge Loan [Member]
Noncontrolling Interest [Line Items]
Repayments of debt	$ 1,150
IEnova [Member] \| Related Party Debt [Member]
Noncontrolling Interest [Line Items]
Repayments of debt	100
IEnova [Member] \| Revolving Credit Facility [Member]
Noncontrolling Interest [Line Items]
Repayments of debt	250
Ventika [Member] \| IEnova [Member]
Noncontrolling Interest [Line Items]
Cash consideration (fair value of total consideration)	$ 50
Shareholders' equity [Member]
Noncontrolling Interest [Line Items]
Impact of issuance on equity						281
Shareholders' equity [Member] \| IEnova [Member]
Noncontrolling Interest [Line Items]
Impact of issuance on equity						281
Non-controlling interests [Member]
Noncontrolling Interest [Line Items]
Impact of issuance on equity					$ 196	1,420
Non-controlling interests [Member] \| IEnova [Member]
Noncontrolling Interest [Line Items]
Impact of issuance on equity						$ 948
Sempra Renewables [Member] \| Noncontrolling Tax Equity Investors [Member]
Noncontrolling Interest [Line Items]
Number of Tax Equity Limited Liability Companies Formed \| company				2
Proceeds from sale of noncontrolling interests			$ 474
Solar Power Projects [Member] \| Sempra Renewables [Member] \| Noncontrolling Tax Equity Investors [Member]
Noncontrolling Interest [Line Items]
Number of facilities acquired \| facility			3	4
Proceeds from sale of noncontrolling interests				$ 104
Wind Generation Projects [Member] \| Sempra Renewables [Member] \| Noncontrolling Tax Equity Investors [Member]
Noncontrolling Interest [Line Items]
Number of facilities acquired \| facility				1
Proceeds from sale of noncontrolling interests				$ 92