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ACQUISITION OF BUSINESSES - Purchase Price Allocation (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 01, 2018 | Dec. 31, 2017 | Apr. 04, 2017
--- | --- | --- | --- | ---
Fair value of assets and liabilities acquired |  |  |  |
Goodwill | $ 1,949 |  | $ 1,301 |
Colombian Gas Distribution Operation [Member] |  |  |  |
Consideration transferred |  |  |  |
Cash |  | $ 118 |  |
Business combinations, pre-existing interest, equity |  | 32 |  |
Total consideration |  | 150 |  |
Fair value of assets and liabilities acquired |  |  |  |
Cash and cash equivalents |  | 21 |  |
Accounts receivable and other |  | 275 |  |
Property, plant and equipment |  | 487 |  |
Intangible assets |  | 17 |  |
Goodwill |  | 770 |  |
Accounts payable and other |  | (238) |  |
Deferred income tax and other liabilities |  | (83) |  |
Non-recourse borrowings |  | (185) |  |
Net assets acquired before non-controlling interest |  | 1,064 |  |
Non-controlling interest |  | (914) |  |
Net assets acquired |  | $ 150 |  |
Aggregated individually immaterial business combinations |  |  |  |
Consideration transferred |  |  |  |
Cash |  |  | 9 |
Deferred consideration, acquisition-date fair value |  |  | 21 |
Total consideration |  |  | 30 |
Fair value of assets and liabilities acquired |  |  |  |
Accounts receivable and other |  |  | 28 |
Property, plant and equipment |  |  | 104 |
Goodwill |  |  | 14 |
Deferred income tax and other liabilities |  |  | (30) |
Non-recourse borrowings |  |  | (30) |
Net assets acquired before non-controlling interest |  |  | 86 |
Non-controlling interest |  |  | (56) |
Net assets acquired |  |  | $ 30 |
Brazilian Regulated Gas Transmission Operation [Member] |  |  |  |
Consideration transferred |  |  |  |
Cash |  |  |  | $ 1,306
Deferred consideration, acquisition-date fair value |  |  |  | 262
Total consideration |  |  |  | 1,568
Fair value of assets and liabilities acquired |  |  |  |
Cash and cash equivalents |  |  |  | 89
Accounts receivable and other |  |  |  | 317
Intangible assets |  |  |  | 5,515
Goodwill |  |  |  | 804
Accounts payable and other |  |  |  | (202)
Deferred income tax and other liabilities |  |  |  | (946)
Net assets acquired before non-controlling interest |  |  |  | 5,577
Non-controlling interest |  |  |  | (4,009)
Net assets acquired |  |  |  | $ 1,568

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