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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - NONCONTROLLING INTERESTS (Details) $ / shares in Units, $ in Millions, $ in Millions				1 Months Ended					3 Months Ended		12 Months Ended
	Jan. 12, 2018 USD ($)	Oct. 13, 2016 USD ($) $ / shares $ / $ shares	Oct. 13, 2016 MXN ($) shares	Feb. 28, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)	Dec. 31, 2016 USD ($) facility	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) facility company	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2018	Oct. 19, 2016	Oct. 18, 2016
Noncontrolling Interest [Line Items]
Stock repurchased in the period											$ 21	$ 15	$ 56
Repayments of debt	$ 800						$ 800
Impact of issuance on equity											90	196	1,701
Decrease from divestiture from noncontrolling interests											486
IEnova [Member]
Noncontrolling Interest [Line Items]
Stock repurchased during the period (in shares) \| shares									2,000,000
Stock repurchased in the period									$ 7
Ownership interest															66.40%	81.10%
Price of shares issued (in pesos per share) \| $ / shares		$ 80.00
Additional shares purchased (in shares) \| shares		83,125,000
Cash consideration (fair value of total consideration)		$ 351
Shares issued (in shares) \| shares		380,000,000	380,000,000
Proceeds from sale of shares		$ 1,570	$ 29,860
Exchange rate (in pesos) \| $ / $		18.96
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]
Stock repurchased in the period											21	15	56
Impact of issuance on equity											4		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											86	$ 196	1,420
Decrease from divestiture from noncontrolling interests											$ 486
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
Sempra Renewables [Member] \| Tax equity arrangement – solar [Member]
Noncontrolling Interest [Line Items]
Decrease from divestiture from noncontrolling interests					$ 486
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						$ 85				$ 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
IEnova [Member]
Noncontrolling Interest [Line Items]
Ownership interest					66.50%				66.50%		66.50%			66.40%
Subsequent Event [Member] \| IEnova [Member]
Noncontrolling Interest [Line Items]
Stock repurchased during the period (in shares) \| shares				1,600,000
Stock repurchased in the period				$ 6