SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	$ 26	$ 6
Due from unconsolidated affiliates - noncurrent	201	186
Due to unconsolidated affiliates - current	$ (11)	(14)
Joint venture with PEMEX [Member]
Related Party Transaction [Line Items]
Related party transaction rate	5.27%
ESJ joint venture [Member]
Related Party Transaction [Line Items]
Related party transaction rate	7.15%
Sempra LNG and Midstream [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent	$ 0	3
LIBOR [Member] \| Joint venture with PEMEX [Member]
Related Party Transaction [Line Items]
Variable percentage rate	450.00%
LIBOR [Member] \| ESJ joint venture [Member]
Related Party Transaction [Line Items]
Variable percentage rate	637.50%
Sempra South American Utilities [Member] \| Eletrans [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent	$ 96	72
Sempra South American Utilities [Member] \| Other related parties [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent	1	0
Sempra Mexico [Member] \| PEMEX Three year loan A [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent	2	3
Sempra Mexico [Member] \| PEMEX Four year loan A [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent	44	42
Sempra Mexico [Member] \| PEMEX Four year loan B [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent	35	34
Sempra Mexico [Member] \| PEMEX Four year loan C [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent	9	8
Sempra Mexico [Member] \| ESJ joint venture [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - noncurrent	14	24
Parent Company [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	73	62
Due from unconsolidated affiliates - noncurrent	0	457
Due to unconsolidated affiliates - current	(359)	(332)
San Diego Gas and Electric Company [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	4	1
Due to unconsolidated affiliates - current	(15)	(55)
San Diego Gas and Electric Company [Member] \| Due to/from Sempra Energy [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	3	0
Due to unconsolidated affiliates - current	0	(34)
Income taxes due from (to) Sempra Energy	159	28
San Diego Gas and Electric Company [Member] \| Due to/from Various Affiliates
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	1	1
Due to unconsolidated affiliates - current	(7)	(8)
San Diego Gas and Electric Company [Member] \| Due to/from SoCalGas
Related Party Transaction [Line Items]
Due to unconsolidated affiliates - current	(8)	(13)
Southern California Gas Company [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	8	48
Due to unconsolidated affiliates - current	(28)	0
Southern California Gas Company [Member] \| Due to/from Sempra Energy [Member]
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	0	35
Due to unconsolidated affiliates - current	(28)	0
Income taxes due from (to) Sempra Energy	$ 5	$ 1
Related party transaction rate	0.68%	0.11%
Loan to unconsolidated affiliate, principal	$ 31	$ 50
Southern California Gas Company [Member] \| Due to/from SDG&E
Related Party Transaction [Line Items]
Due from unconsolidated affiliates - current	$ 8	$ 13

Loan to unconsolidated affiliate, principal

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

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Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due after 1 year (or 1 business cycle).

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Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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