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ACQUISTION AND DIVESTITURE ACTIVITY - DIVESTITURES (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
May 31, 2016
Mar. 31, 2016
Mar. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 12, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Liabilities assumed           $ 0 $ 448  
Sempra LNG & Midstream [Member] | Disposal Group Disposed of by Sale [Member] | Energy South [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Gain on sale of equity interests $ 130 $ 130            
Gain on sale of assets, after tax 78              
Proceeds from sale               $ 318
Cash               $ 2
Liabilities assumed $ 67              
Sempra LNG & Midstream [Member] | Rockies Express [Member]                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Ownership percentage in equity method investee     25.00% 25.00% 25.00%      
Proceeds from sale of investments     $ 443 $ 440        
Equity method investment       484 $ 484      
Estimated fair value       $ 440 440      
Other than temporary impairment in investment         44      
Other than temporary impairment in investment, net of tax         $ 27