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DISPOSITION OF CHILEAN ELECTRICITY TRANSMISSION OPERATION - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 15, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |
Proceeds from sales of investments accounted for using equity method |  | $ 0 |  | $ 0 | $ 1,289 | $ 0 |  |
Investments accounted for using equity method |  | 4,407 |  |  | 4,407 |  | $ 5,572 | $ 4,727
Gain (Loss) on Disposition of Business |  | 0 |  | 0 | 338 | 0 |  |
Current tax expense (income) |  | 46 |  | $ 38 | 216 | $ 50 |  |
Chilean electricity transmission operation [Member] |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |
Ownership and Voting Interest Held In Associate And Joint Venture | 27.80% |  |  |  |  |  |  |
Proceeds from sales of investments accounted for using equity method | $ 1,300 |  |  |  |  |  |  |
Investments accounted for using equity method | $ 951 | $ 0 |  |  | 0 |  | $ 930 |
Gain (Loss) on Disposition of Business |  |  | $ 338 |  |  |  |  |
Transaction Related Costs |  |  | 11 |  |  |  |  |
Current tax expense (income) |  |  | 129 |  | $ 127 |  |  |
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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