OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	$ 200	[1]		$ 226	[1]
San Diego Gas and Electric Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, current	41			1
Due to affiliate, current	2			21
Revenues from unconsolidated affiliates	3		3
Southern California Gas Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, current	61			4
Due to affiliate, current	0			13
Revenues from unconsolidated affiliates	19		18
Due to/from Sempra Energy | San Diego Gas and Electric Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, current	40			0
Due to affiliate, current	0			17
Income taxes due from Sempra Energy	15	[2]		16	[2]
Due to/from Sempra Energy | Southern California Gas Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, current	59			0
Income taxes due to Sempra Energy	(107)	[2]
Income taxes due from Sempra Energy				9	[2]
Subsidiary Of Common Parent S D G E [Member] | Southern California Gas Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, current	2			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	2			4
Subsidiary Of Common Parent Other Affiliates [Member] | San Diego Gas and Electric Company [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, current	$ 1			$ 1

[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 the companies having always filed a separate return.