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ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($) |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 01, 2018 | Apr. 04, 2017 | Jun. 30, 2018 | Dec. 31, 2017
Disclosure of detailed information about business combination [line items] |  |  |  |
Goodwill |  |  | $ 1,949,000,000 | $ 1,301,000,000
Colombian Gas Distribution Operation [Member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Profit (loss) |  |  | 571,000,000 |
Proportion of ownership interest in subsidiary | 16.00% |  |  |
Total consideration | $ 150,000,000 |  |  |
Equity funded consideration | 88,000,000 |  |  |
Cash | $ 118,000,000 |  |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  | 2,000,000 |
Pre-existing equity interest, percentage | 3.00% |  |  |
Business combinations, pre-existing interest, equity | $ 32,000,000 |  |  |
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination |  |  | 0 |
Increase through business combinations, deferred tax liability | 76,000,000 |  |  |
Goodwill not deductible tax purposes | 76,000,000 |  |  |
Goodwill | 770,000,000 |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  | $ 2,457,000,000 |
Goodwill expected to be deductible for tax purposes | 0 |  |  |
Colombian Gas Distribution Operation [Member] | Consortium |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Total consideration | 522,000,000 |  |  |
Equity funded consideration | $ 309,000,000 |  |  |
Brazilian Regulated Gas Transmission Operation [Member] |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Proportion of ownership interest in subsidiary |  | 28.00% |  |
Total consideration |  | $ 1,568,000,000 |  |
Cash |  | 1,306,000,000 |  |
Deferred consideration |  | $ 262,000,000 |  |
Period of payable from close of transaction |  | 5 years |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  | 8,000,000
Deferred consideration, annual interest accrual |  | 3.35% |  |
Increase through business combinations, deferred tax liability |  | $ 893,000,000 |  |
Goodwill |  | 804,000,000 |  |
Goodwill expected to be deductible for tax purposes |  | 0 |  |
Brazilian Regulated Gas Transmission Operation [Member] | Consortium |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Total consideration |  | 5,100,000,000 |  |
Cash |  | 4,200,000,000 |  |
Deferred consideration |  | $ 900,000,000 |  |
Aggregated individually immaterial business combinations |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |
Total consideration |  |  |  | 30,000,000
Cash |  |  |  | 9,000,000
Deferred consideration |  |  |  | 21,000,000
Goodwill |  |  |  | $ 14,000,000

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