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ACQUISITION OF BUSINESSES - Purchase Price Allocation (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Mar. 22, 2019 | Jan. 04, 2019 | Dec. 31, 2018 | Nov. 05, 2018 | Oct. 16, 2018 | Oct. 01, 2018 | Sep. 07, 2018 | Jun. 01, 2018
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Consideration transferred |  |  |  |  |  |  |  |  |
Non-controlling interest, Exchange LP units, equity | $ 21 |  |  | $ 71 |  |  |  |  |
Fair value of assets and liabilities acquired |  |  |  |  |  |  |  |  |
Goodwill | 4,005 |  |  | 3,859 |  |  |  |  |
Indian Natural Gas Operation [Member] |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |
Cash |  | $ 443 |  |  |  |  |  |  |
Total consideration |  | 443 |  |  |  |  |  |  |
Fair value of assets and liabilities acquired |  |  |  |  |  |  |  |  |
Accounts receivable and other |  | 94 |  |  |  |  |  |  |
Property, plant and equipment |  | 2,134 |  |  |  |  |  |  |
Intangible assets |  | 295 |  |  |  |  |  |  |
Accounts payable and other |  | (66) |  |  |  |  |  |  |
Net assets acquired before non-controlling interest |  | 2,457 |  |  |  |  |  |  |
Non-controlling interest |  | (2,014) |  |  |  |  |  |  |
Net assets acquired |  | $ 443 |  |  |  |  |  |  |
Australian Data Center Operation [Member] |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |
Cash |  |  | $ 78 |  |  |  |  |  |
Total consideration |  |  | 78 |  |  |  |  |  |
Fair value of assets and liabilities acquired |  |  |  |  |  |  |  |  |
Accounts receivable and other |  |  | 2 |  |  |  |  |  |
Accounts payable and other |  |  | (9) |  |  |  |  |  |
Investment Properties Recognised as of Acquisition Date |  |  | 211 |  |  |  |  |  |
Goodwill |  |  | 68 |  |  |  |  |  |
Net assets acquired before non-controlling interest |  |  | 272 |  |  |  |  |  |
Non-controlling interest |  |  | (194) |  |  |  |  |  |
Net assets acquired |  |  | $ 78 |  |  |  |  |  |
Aggregated individually immaterial business combinations |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |
Cash | 14 |  |  |  |  |  |  |  |
Business combinations, pre-existing interest, equity | 17 |  |  |  |  |  |  |  |
Total consideration | 31 |  |  |  |  |  |  |  |
Fair value of assets and liabilities acquired |  |  |  |  |  |  |  |  |
Accounts receivable and other | 3 |  |  |  |  |  |  |  |
Intangible assets | 225 |  |  |  |  |  |  |  |
Accounts payable and other | (22) |  |  |  |  |  |  |  |
Goodwill | 15 |  |  |  |  |  |  |  |
Cash and cash equivalents | 5 |  |  |  |  |  |  |  |
Non-recourse borrowings | (105) |  |  |  |  |  |  |  |
Deferred income tax and other liabilities | (20) |  |  |  |  |  |  |  |
Net assets acquired before non-controlling interest | 101 |  |  |  |  |  |  |  |
Non-controlling interest | (70) |  |  |  |  |  |  |  |
Net assets acquired | $ 31 |  |  |  |  |  |  |  |
U.S. Data Center Operation [Member] |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |
Cash |  |  |  | 315 |  |  |  |  |
Total consideration |  |  |  | 315 |  |  |  |  |
Fair value of assets and liabilities acquired |  |  |  |  |  |  |  |  |
Accounts receivable and other |  |  |  | 3 |  |  |  |  |
Property, plant and equipment |  |  |  | 440 |  |  |  |  |
Intangible assets |  |  |  | 221 |  |  |  |  |
Accounts payable and other |  |  |  | (24) |  |  |  |  |
Goodwill |  |  |  | 463 |  |  |  |  |
Net assets acquired before non-controlling interest |  |  |  | 1,103 |  |  |  |  |
Non-controlling interest |  |  |  | (788) |  |  |  |  |
Net assets acquired |  |  |  | $ 315 |  |  |  |  |
Rayalseema Expressway Limited [Domain] |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | $ 3 |  |  |  |
Contingent consideration, acquisition-date fair value |  |  |  |  | 2 |  |  |  |
Total consideration |  |  |  |  | 5 |  |  |  |
Fair value of assets and liabilities acquired |  |  |  |  |  |  |  |  |
Accounts receivable and other |  |  |  |  | 3 |  |  |  |
Intangible assets |  |  |  |  | 226 |  |  |  |
Accounts payable and other |  |  |  |  | (60) |  |  |  |
Non-recourse borrowings |  |  |  |  | (151) |  |  |  |
Net assets acquired before non-controlling interest |  |  |  |  | 18 |  |  |  |
Non-controlling interest |  |  |  |  | (13) |  |  |  |
Net assets acquired |  |  |  |  | $ 5 |  |  |  |
North American Residential Energy Infrastructure Operation [Member] |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  | $ 491 |  |  |
Non-controlling interest, Exchange LP units, equity |  |  |  |  |  | 232 |  |  |
Total consideration |  |  |  |  |  | 723 |  |  |
Fair value of assets and liabilities acquired |  |  |  |  |  |  |  |  |
Accounts receivable and other |  |  |  |  |  | 187 |  |  |
Property, plant and equipment |  |  |  |  |  | 669 |  |  |
Intangible assets |  |  |  |  |  | 1,863 |  |  |
Accounts payable and other |  |  |  |  |  | (235) |  |  |
Goodwill |  |  |  |  |  | 1,260 |  |  |
Cash and cash equivalents |  |  |  |  |  | 24 |  |  |
Non-recourse borrowings |  |  |  |  |  | (877) |  |  |
Deferred income tax and other liabilities |  |  |  |  |  | (472) |  |  |
Inventory recognised as of acquisition date |  |  |  |  |  | 23 |  |  |
Net assets acquired before non-controlling interest |  |  |  |  |  | 2,442 |  |  |
Non-controlling interest |  |  |  |  |  | (1,719) |  |  |
Net assets acquired |  |  |  |  |  | $ 723 |  |  |
Western Canadian Natural Gas Gathering and Processing Operation [Member] |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  | $ 559 |  |
Total consideration |  |  |  |  |  |  | 559 |  |
Fair value of assets and liabilities acquired |  |  |  |  |  |  |  |  |
Accounts receivable and other |  |  |  |  |  |  | 55 |  |
Property, plant and equipment |  |  |  |  |  |  | 1,442 |  |
Intangible assets |  |  |  |  |  |  | 157 |  |
Accounts payable and other |  |  |  |  |  |  | (46) |  |
Goodwill |  |  |  |  |  |  | 524 |  |
Cash and cash equivalents |  |  |  |  |  |  | 10 |  |
Deferred income tax and other liabilities |  |  |  |  |  |  | (186) |  |
Net assets acquired before non-controlling interest |  |  |  |  |  |  | 1,956 |  |
Non-controlling interest |  |  |  |  |  |  | (1,397) |  |
Net assets acquired |  |  |  |  |  |  | $ 559 |  |
Simhapuri Expressway Limited [Domain] |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  | $ 53 |
Total consideration |  |  |  |  |  |  |  | 53 |
Fair value of assets and liabilities acquired |  |  |  |  |  |  |  |  |
Accounts receivable and other |  |  |  |  |  |  |  | 33 |
Intangible assets |  |  |  |  |  |  |  | 488 |
Accounts payable and other |  |  |  |  |  |  |  | (61) |
Goodwill |  |  |  |  |  |  |  | 23 |
Cash and cash equivalents |  |  |  |  |  |  |  | 1 |
Non-recourse borrowings |  |  |  |  |  |  |  | (279) |
Deferred income tax and other liabilities |  |  |  |  |  |  |  | (23) |
Net assets acquired before non-controlling interest |  |  |  |  |  |  |  | 182 |
Non-controlling interest |  |  |  |  |  |  |  | (129) |
Net assets acquired |  |  |  |  |  |  |  | $ 53 |
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 |  |  |  |  |  |  |  |  |
Accounts receivable and other |  |  |  |  |  |  |  |  | 245
Property, plant and equipment |  |  |  |  |  |  |  |  | 394
Intangible assets |  |  |  |  |  |  |  |  | 253
Accounts payable and other |  |  |  |  |  |  |  |  | (165)
Goodwill |  |  |  |  |  |  |  |  | 621
Cash and cash equivalents |  |  |  |  |  |  |  |  | 36
Non-recourse borrowings |  |  |  |  |  |  |  |  | (177)
Deferred income tax and other liabilities |  |  |  |  |  |  |  |  | (143)
Net assets acquired before non-controlling interest |  |  |  |  |  |  |  |  | 1,064
Non-controlling interest |  |  |  |  |  |  |  |  | (914)
Net assets acquired |  |  |  |  |  |  |  |  | $ 150

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