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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.