OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended			12 Months Ended
		Jun. 30, 2015		Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014	Dec. 31, 2014
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	[1]	$ 173			$ 173			$ 226
San Diego Gas and Electric Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, current		1			1			1
Due to affiliate, current		7			7			21
Revenues from unconsolidated affiliates		2		$ 3	5		$ 6
Southern California Gas Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, current		273			273			4
Due to affiliate, current		0			0			13
Revenues from unconsolidated affiliates		17		$ 16	36		$ 34
Due to/from Sempra Energy | San Diego Gas and Electric Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due to affiliate, current		7			7			17
Income taxes due from Sempra Energy	[2]				97			16
Due to/from Sempra Energy | Southern California Gas Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, current		273	[3]		273	[3]		0
Income taxes due to Sempra Energy	[2]				(19)
Income taxes due from Sempra Energy	[2]							9
Loan to unconsolidated affiliate, principal		279			$ 279
Interest rate on due from affiliate, noncurrent					0.08%
Subsidiary Of Common Parent S D G E [Member] | Southern California Gas Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, current		0			$ 0			4
Subsdiary Of Common Parent So Cal Gas [Member] | San Diego Gas and Electric Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due to affiliate, current		$ 0			$ 0			$ 4

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

[2] 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.

[3] Net receivable includes a loan to Sempra Energy of $279 million at June 30, 2015 at an interest rate of 0.08 percent.