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ACQUISITION AND DIVESTITURE ACTIVITY - ASSETS HELD FOR SALE (Details) - Sempra Mexico [Member] - TdM [Member]
$ in Millions
1 Months Ended 3 Months Ended
Feb. 29, 2016
MW
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Assets Held for Sale [Line Items]      
Power generating capacity | MW 625    
Deferred tax expense from the outside basis difference   $ 5 $ (29)
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]      
Assets Held for Sale, Assets [Abstract]      
Cash   1  
Inventories   11  
Other current assets   31  
Deferred income taxes   9  
Property, plant and equipment, net   120  
Other noncurrent assets   24  
Total assets held for sale   196  
Assets Held for Sale, Liabilities [Abstract]      
Accounts payable   6  
Other current liabilities   4  
Asset retirement obligations   4  
Other noncurrent liabilities   26  
Total liabilities held for sale   $ 40