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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES (Details) $ in Millions, $ in Billions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 MXN ($)	Mar. 31, 2016
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	$ 39	$ 37
Due from unconsolidated affiliates - noncurrent	688	598
Due to unconsolidated affiliates - current	(10)	(7)
Due to unconsolidated affiliates, noncurrent	$ (37)	(35)
ESJ joint venture [Member]
Related Party Transaction [Line Items]
Related party transaction rate	8.89%
TAG Pipeline Norte [Member]
Related Party Transaction [Line Items]
Related party transaction rate	5.77%
LIBOR [Member] \| ESJ joint venture [Member]
Related Party Transaction [Line Items]
Variable percentage rate	6.375%
LIBOR [Member] \| TAG Pipeline Norte [Member]
Related Party Transaction [Line Items]
Variable percentage rate	2.90%
Sempra South American Utilities [Member] \| Eletrans [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent	$ 43	103
Sempra South American Utilities [Member] \| Other related parties [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent	1	1
Sempra Mexico [Member] \| IMG [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent	641	487
Total facility	721		$ 14.2
Sempra Mexico [Member] \| ESJ joint venture [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent	$ 3	7
Sempra Mexico [Member] \| TAG Pipeline Norte [Member]
Related Party Transaction [Line Items]
Ownership percentage in equity method investee	50.00%		50.00%
Due to unconsolidated affiliates, noncurrent	$ (37)	(35)
Sempra Mexico [Member] \| Interbank Equilibrium Rate [Member] \| IMG [Member]
Related Party Transaction [Line Items]
Variable percentage rate	2.20%
Related party transaction rate	10.84%
San Diego Gas and Electric Company [Member]
Related Party Transaction [Line Items]
Due to unconsolidated affiliates - current	$ (61)	(40)
Total facility	750
San Diego Gas and Electric Company [Member] \| Due to/from Sempra Energy [Member]
Related Party Transaction [Line Items]
Due to unconsolidated affiliates - current	(43)	(30)
Income taxes due from Sempra Energy	5	27
San Diego Gas and Electric Company [Member] \| Due to/from SoCalGas [Member]
Related Party Transaction [Line Items]
Due to unconsolidated affiliates - current	(6)	(4)
San Diego Gas and Electric Company [Member] \| Due to/from Various Affiliates [Member]
Related Party Transaction [Line Items]
Due to unconsolidated affiliates - current	(12)	(6)
Southern California Gas Company [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	7	4
Due to unconsolidated affiliates - current	(34)	(35)
Total facility	750
Southern California Gas Company [Member] \| Due to/from Sempra Energy [Member]
Related Party Transaction [Line Items]
Due to unconsolidated affiliates - current	(34)	(35)
Income taxes due to Sempra Energy	(4)
Income taxes due from Sempra Energy		10
Southern California Gas Company [Member] \| Due to/from Various Affiliates [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	1	0
Southern California Gas Company [Member] \| Due to/from SDGE [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	$ 6	$ 4
Rockies Express [Member] \| Sempra LNG & Midstream [Member]
Related Party Transaction [Line Items]
Ownership percentage in equity method investee				25.00%