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RECENT BUSINESS ACQUISITIONS (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Jul. 31, 2015
Black Oak Getty Wind [Member]      
Business Acquisition [Line Items]      
Cash consideration (fair value of total consideration)   $ 8  
Equity Method Investment Ownership Percentage   100.00%  
PEMEX [Member]      
Business Acquisition [Line Items]      
Ownership Percentage in consolidated entity 50.00%    
IEnova [Member]      
Business Acquisition [Line Items]      
Ownership percentage before acquisition     50.00%
Acquired percentage interest in joint venture     100.00%
Net Debt Not Assumed By Investee $ 170    
Business Acquisition Purchase Price Allocation Equity Method Investment $ 1,325    
Ownership Percentage in consolidated entity 25.00%    
Equity Method Investment Ownership Percentage     50.00%