OTHER FINANCIAL DATA - TRANSACTIONS WITH AFFILIATES 2 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	$ 200	[1]	$ 226	[1]
Joint venture with PEMEX [Member]
Transactions With Affiliates Disclosure [Line Items]
Interest rate on due from affiliate, noncurrent	4.67%
PEMEX Four year loan C [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	8	[1],[2]	8	[1],[2]
PEMEX Three year loan A [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	44	[1],[2]	44	[1],[2]
PEMEX Four year loan B [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	33	[1],[2]	33	[1],[2]
PEMEX Four year loan A [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	41	[1],[2]	40	[1],[2]
ESJ joint venture [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	23	[1],[3]	22	[1],[3]
Interest rate on due from affiliate, noncurrent	6.55%
Eletrans [Member]
Transactions With Affiliates Disclosure [Line Items]
Due from affiliate, noncurrent	46	[1],[4]	41	[1],[4]
Interest rate on due from affiliate, noncurrent	4.00%
Affiliate Of Investee [Member]
Transactions With Affiliates Disclosure [Line Items]
Due From Joint Ventures Noncurrent	$ 5	[1],[5]	$ 38	[1],[5]

[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 (4.67 percent at March 31, 2015), to finance the Los Ramones Norte pipeline project.

[3] U.S. dollar-denominated loan, at a variable interest rate based on a 30-day LIBOR plus 637.5 basis points (6.55 percent at March 31, 2015), to finance the first phase of the Energía Sierra Juárez wind project.

[4] 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.

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