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DISPOSITION OF CHILEAN ELECTRICITY TRANSMISSION OPERATION DISPOSITION OF CHILEAN ELECTRICITY TRANSMISSION OPERATION - Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 15, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |
Proceeds from sales of investments accounted for using equity method |  | $ 1,289 | $ 0 | $ 0
Investments accounted for using equity method |  | 4,591 | 5,572 | 4,727
Gain (loss) on disposition of business |  | 338 | 0 | 0
Current income tax expense |  | 318 | $ 106 | $ 33
Chilean electricity transmission operation |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |
Ownership and Voting Interest | 27.80% |  |  |
Proceeds from sales of investments accounted for using equity method | $ 1,300 |  |  |
Investments accounted for using equity method | $ 951 |  |  |
Gain (loss) on disposition of business |  | 338 |  |
Transaction Related Costs |  | 11 |  |
Current income tax expense |  | 129 |  |
Increase (decrease) through transfer between revaluation surplus and retained earnings, equity |  | 641 |  |
Reclassification adjustments on exchange differences on translation, net of tax |  | $ 35 |  |

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