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ACQUISITION OF BUSINESSES - Purchase Price Allocation (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Nov. 05, 2018 | Oct. 16, 2018 | Oct. 01, 2018 | Sep. 07, 2018 | Jun. 01, 2018 | Dec. 31, 2017 | Apr. 04, 2017
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Consideration transferred |  |  |  |  |  |  |  |
Non-controlling interest, Exchange LP units, equity | $ 71 |  |  |  |  |  | $ 0 |
Fair value of assets and liabilities acquired |  |  |  |  |  |  |  |
Goodwill | 3,859 |  |  |  |  |  | 1,301 |
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 |  |  |  |  |  |  |
Goodwill | 463 |  |  |  |  |  |  |
Accounts payable and other | (24) |  |  |  |  |  |  |
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 |  |  |  |  |
Goodwill |  |  | 1,260 |  |  |  |  |
Accounts payable and other |  |  | (235) |  |  |  |  |
Non-recourse borrowings |  |  | (877) |  |  |  |  |
Cash and cash equivalents |  |  | 24 |  |  |  |  |
Deferred income tax assets |  |  | 23 |  |  |  |  |
Deferred income tax and other liabilities |  |  | (472) |  |  |  |  |
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 |  |  |  |
Goodwill |  |  |  | 524 |  |  |  |
Accounts payable and other |  |  |  | (46) |  |  |  |
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 |  |  |
Goodwill |  |  |  |  | 37 |  |  |
Accounts payable and other |  |  |  |  | (61) |  |  |
Non-recourse borrowings |  |  |  |  | (279) |  |  |
Cash and cash equivalents |  |  |  |  | 1 |  |  |
Deferred income tax and other liabilities |  |  |  |  | (37) |  |  |
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 |  |
Goodwill |  |  |  |  |  | 621 |  |
Accounts payable and other |  |  |  |  |  | (165) |  |
Non-recourse borrowings |  |  |  |  |  | (177) |  |
Cash and cash equivalents |  |  |  |  |  | 36 |  |
Deferred income tax and other liabilities |  |  |  |  |  | (143) |  |
Net assets acquired before non-controlling interest |  |  |  |  |  | 1,064 |  |
Non-controlling interest |  |  |  |  |  | (914) |  |
Net assets acquired |  |  |  |  |  | $ 150 |  |
Brazilian regulated gas transmission operation |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  | $ 1,306
Deferred consideration, acquisition-date fair value |  |  |  |  |  |  |  | 262
Total consideration |  |  |  |  |  |  |  | 1,568
Fair value of assets and liabilities acquired |  |  |  |  |  |  |  |
Accounts receivable and other |  |  |  |  |  |  |  | 317
Intangible assets |  |  |  |  |  |  |  | 5,515
Goodwill |  |  |  |  |  |  |  | 804
Accounts payable and other |  |  |  |  |  |  |  | (202)
Cash and cash equivalents |  |  |  |  |  |  |  | 89
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
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 |
Non-recourse borrowings |  |  |  |  |  |  | (30) |
Deferred income tax and other liabilities |  |  |  |  |  |  | (30) |
Net assets acquired before non-controlling interest |  |  |  |  |  |  | 86 |
Non-controlling interest |  |  |  |  |  |  | (56) |
Net assets acquired |  |  |  |  |  |  | $ 30 |

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