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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
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Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |
Revenues | $ 11,703 | $ 11,224
Net income | 1,130 | 356
Earnings | $ 928 | $ 261

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