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ACQUISTION AND DIVESTITURE ACTIVITY - PRO FORMA INFORMATION (Details) - Compania Transmisora del Norte Grande S.A. [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Revenues $ 11,703 $ 11,224
Net income 1,130 356
Earnings $ 928 $ 261