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ACQUISTION AND DIVESTITURE ACTIVITY - SUMMARY OF DECONSOLIDATIONS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Equity method investment $ 2,080   $ 2,889
Disposal Group Disposed of by Sale [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Proceeds, net of transaction costs 304 $ 152  
Cash (2) (10)  
Restricted cash 0 (5)  
Inventory (3) 0  
Other current assets (14) (23)  
Regulatory assets (12) 0  
Goodwill (72) 0  
Property, plant and equipment, net (199) (1,557)  
Other noncurrent assets (53) (65)  
Accounts payable and accrued expenses 12 188  
Due to affiliates 0 39  
Other current liabilities 13 0  
Long-term debt, including current portion 67 251  
Deferred income taxes 36 0  
Regulatory liabilities 23 0  
Asset retirement obligations 12 0  
Other noncurrent liabilities 18 12  
Accumulated other comprehensive income 0 (7)  
Gain on sale of business and equity interests (130) (60)  
Equity method investment $ 0 $ (1,085)