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EMPLOYEE BENEFIT PLANS - PROFIT SHARING PLANS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Chilquinta Energia Profit Sharing [Member]      
Profit Sharing Plans [Line Items]      
Recorded Annual Profit Sharing Expense $ 7 $ 7 $ 5
Luz del Sur Profit Sharing [Member]      
Profit Sharing Plans [Line Items]      
Recorded Annual Profit Sharing Expense $ 13 $ 12 $ 10