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Amount of receivables owed to an entity that is affiliated with the reporting entity by means of direct or indirect ownership, which are usually due after one year (or one business cycle, if longer).

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties.

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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 MXN ($)
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	$ 32,000,000	$ 37,000,000
Due from unconsolidated affiliates - noncurrent	742,000,000	644,000,000
Due to unconsolidated affiliates - current	(5,000,000)	(10,000,000)
Due to unconsolidated affiliates, noncurrent	$ (195,000,000)	$ (37,000,000)
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	4.81%
TAG JV Notes [Member]
Related Party Transaction [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.74%		5.74%
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 Mexico [Member]
Related Party Transaction [Line Items]
Due to unconsolidated affiliates, noncurrent	$ (195,000,000)	$ (37,000,000)
Sempra Mexico [Member] \| IMG [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent	742,000,000	641,000,000
Total facility	751,000,000		$ 14,200,000,000
Sempra Mexico [Member] \| ESJ joint venture [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent	0	3,000,000
Sempra Mexico [Member] \| TAG Pipeline Norte [Member]
Related Party Transaction [Line Items]
Due to unconsolidated affiliates, noncurrent	(39,000,000)	(37,000,000)
Sempra Mexico [Member] \| TAG JV Notes [Member]
Related Party Transaction [Line Items]
Due to unconsolidated affiliates, noncurrent	$ (156,000,000)	0
Sempra Mexico [Member] \| Interbank Equilibrium Rate [Member] \| IMG [Member]
Related Party Transaction [Line Items]
Variable percentage rate	2.20%
Related party transaction rate	9.65%
San Diego Gas and Electric Company [Member]
Related Party Transaction [Line Items]
Due to unconsolidated affiliates - current	$ (53,000,000)	(61,000,000)
Total facility	1,500,000,000
San Diego Gas and Electric Company [Member] \| Due to/from Sempra Energy [Member]
Related Party Transaction [Line Items]
Due to unconsolidated affiliates - current	(37,000,000)	(43,000,000)
Income taxes due from Sempra Energy	130,000,000	5,000,000
San Diego Gas and Electric Company [Member] \| Due to/from SoCalGas [Member]
Related Party Transaction [Line Items]
Due to unconsolidated affiliates - current	(10,000,000)	(6,000,000)
San Diego Gas and Electric Company [Member] \| Due to/from Various Affiliates [Member]
Related Party Transaction [Line Items]
Due to unconsolidated affiliates - current	(6,000,000)	(12,000,000)
Southern California Gas Company [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	11,000,000	7,000,000
Due to unconsolidated affiliates - current	(47,000,000)	(34,000,000)
Total facility	750,000,000
Southern California Gas Company [Member] \| Due to/from Sempra Energy [Member]
Related Party Transaction [Line Items]
Due to unconsolidated affiliates - current	(45,000,000)	(34,000,000)
Income taxes due to Sempra Energy		(4,000,000)
Income taxes due from Sempra Energy	152,000,000
Southern California Gas Company [Member] \| Due to/from Various Affiliates [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	1,000,000	1,000,000
Southern California Gas Company [Member] \| Due to/from SDGE [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	10,000,000	6,000,000
Southern California Gas Company [Member] \| Other related parties [Member]
Related Party Transaction [Line Items]
Due to unconsolidated affiliates - current	$ (2,000,000)	$ 0