OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES 2 (Details) - USD ($) $ in Millions		3 Months Ended
		Jun. 30, 2015		Dec. 31, 2014
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	[1]	$ 173		$ 226
Joint venture with PEMEX [Member]
Transactions With Affiliates Disclosure [Line Items]
Interest rate on due from affiliate, noncurrent		4.68%
PEMEX Four year loan C [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	[1],[2]	$ 8		8
PEMEX Three year loan A [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	[1],[2]	3	[3]	44
PEMEX Four year loan B [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	[1],[2]	33		33
PEMEX Four year loan A [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	[1],[2]	41		40
ESJ joint venture [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	[1],[4]	$ 23		22
Interest rate on due from affiliate, noncurrent		6.56%
Eletrans [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	[1],[5]	$ 61		41
Interest rate on due from affiliate, noncurrent		4.00%
Affiliate Of Investee [Member]
Transactions With Affiliates Disclosure [Line Items]
Due From Joint Ventures Noncurrent	[1],[6]	$ 4		$ 38

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

[2] U.S. dollar-denominated loan, at a variable interest rate based on a 30-day LIBOR plus 450 basis points (4.68 percent at June 30, 2015), to finance the Los Ramones Norte pipeline project.

[3] In May 2015, approximately $41 million was paid with proceeds from project financing at the joint venture.

[4] U.S. dollar-denominated loan, at a variable interest rate based on a 30-day LIBOR plus 637.5 basis points (6.56 percent at June 30, 2015), to finance the first phase of the Energía Sierra Juárez wind project.

[5] 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., an affiliate of Chilquinta Energía.

[6] Amounts represent accounts receivable from various Sempra Renewables and Sempra Mexico joint venture investments.