OTHER FINANCIAL DATA - DUE TO DUE FROM AFFILIATES (Details) - USD ($)		6 Months Ended		12 Months Ended
		Jun. 30, 2016		Dec. 31, 2015
Transactions With Affiliates Disclosure [Line Items]
Due from affiliates, current		$ 6,000,000		$ 6,000,000	[1]
Due to affiliaties, current		(8,000,000)		(14,000,000)	[1]
Due from unconsolidated affiliates		192,000,000		186,000,000	[1]
San Diego Gas and Electric Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliates, current		163,000,000		1,000,000	[1]
Due to affiliaties, current		(190,000,000)		(55,000,000)	[1]
Southern California Gas Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliates, current		7,000,000		48,000,000	[1]
Due to affiliaties, current		(25,000,000)		0	[1]
Due to/from Sempra Energy | San Diego Gas and Electric Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliates, current		163,000,000	[2]	0
Due to affiliaties, current		0		(34,000,000)
Income taxes due from Sempra Energy		$ 59,000,000		28,000,000	[3]
Interest rate on due from affiliate, noncurrent		0.35%
Loan to unconsolidated affiliate, principal		$ 172,000,000
Due to/from Sempra Energy | Southern California Gas Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliates, current		0		35,000,000	[4]
Due to affiliaties, current		(25,000,000)		0
Income taxes due from Sempra Energy		9,000,000		$ 1,000,000	[3]
Interest rate on due from affiliate, noncurrent				0.11%
Loan to unconsolidated affiliate, principal				$ 50,000,000
Due to/from SDG&E | Southern California Gas Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliates, current		7,000,000		13,000,000
Due to/from SoCalGas | San Diego Gas and Electric Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due to affiliaties, current		(7,000,000)		(13,000,000)
Due to/from Other Affiliates | San Diego Gas and Electric Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliates, current		$ 0		1,000,000
Joint venture with PEMEX [Member]
Transactions With Affiliates Disclosure [Line Items]
Interest rate on due from affiliate, noncurrent		4.97%
PEMEX Four year loan C [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from unconsolidated affiliates	[5],[6]	$ 8,000,000		8,000,000
PEMEX Three year loan A [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from unconsolidated affiliates	[5],[6]	2,000,000		3,000,000
PEMEX Four year loan B [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from unconsolidated affiliates	[5],[6]	35,000,000		34,000,000
PEMEX Four year loan A [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from unconsolidated affiliates	[5],[6]	43,000,000		42,000,000
ESJ joint venture [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from unconsolidated affiliates	[5],[7]	$ 17,000,000		24,000,000
Interest rate on due from affiliate, noncurrent		6.84%
Eletrans [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from unconsolidated affiliates	[5],[8]	$ 79,000,000		72,000,000
Interest rate on due from affiliate, noncurrent		4.00%
Sempra South American Utilities [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from unconsolidated affiliates		$ 2,000,000		0
Sempra Natural Gas Segment [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from unconsolidated affiliates		6,000,000		3,000,000
Affiliate Of Investee [Member] | San Diego Gas and Electric Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due to affiliaties, current		$ (183,000,000)		$ (8,000,000)

[1] Derived from audited financial statements.

[2] At June 30, 2016, net receivable included outstanding advances to Sempra Energy of $172 million at an interest rate of 0.35 percent.

[3] SDG&E and SoCalGas are included in the consolidated income tax return of Sempra Energy and are allocated income tax expense from Sempra Energy in an amount equal to that which would result from each company having always filed a separate return.

[4] At December 31, 2015, net receivable included outstanding advances to Sempra Energy of $50 million at an interest rate of 0.11 percent.

[5] Amounts include principal balances plus accumulated interest outstanding.

[6] U.S. dollar-denominated loan, at a variable interest rate based on a 30-day LIBOR plus 450 basis points (4.97 percent at June 30, 2016), to finance the Los Ramones Norte pipeline project.

[7] U.S. dollar-denominated loan, at a variable interest rate based on a 30-day LIBOR plus 637.5 basis points (6.84 percent at June 30, 2016), to finance the first phase of the Energía Sierra Juárez wind project, which is a joint venture of IEnova.

[8] U.S. dollar-denominated loan, at a fixed interest rate with no stated maturity date, to provide project financing for the construction of transmission lines at Eletrans S.A. and Eletrans II S.A., both of which are joint ventures at Chilquinta Energía.