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ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($) |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Nov. 05, 2018 | Oct. 16, 2018 | Oct. 01, 2018 | Sep. 07, 2018 | Jun. 01, 2018 | Apr. 04, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  | $ 4,652,000,000 | $ 3,535,000,000 | $ 2,115,000,000 |
Net income (loss) |  |  |  |  |  |  |  | 806,000,000 | 574,000,000 | 528,000,000 | [1]
Unit issuance |  |  |  |  |  |  |  | 588,000,000 | 1,212,000,000 | $ 941,000,000 |
Increase through business combinations, deferred tax liability |  |  |  |  |  |  |  | 694,000,000 | 930,000,000 |  |
Goodwill | $ 3,859,000,000 |  |  |  |  |  |  | 3,859,000,000 | 1,301,000,000 |  |
U.S. Data Center Operation [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary | 29.00% |  |  |  |  |  |  |  |  |  |
Consideration transferred | $ 315,000,000 |  |  |  |  |  |  | 315,000,000 |  |  |
Equity funded consideration | 164,000,000 |  |  |  |  |  |  | 164,000,000 |  |  |
Asset level debt raised | 151,000,000 |  |  |  |  |  |  | 151,000,000 |  |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  |  | 10,000,000 |  |  |
Revenues |  |  |  |  |  |  |  | 0 |  |  |
Net income (loss) |  |  |  |  |  |  |  | 0 |  |  |
Cash | 315,000,000 |  |  |  |  |  |  | 315,000,000 |  |  |
Goodwill expected to be deductible for tax purposes | 463,000,000 |  |  |  |  |  |  | 463,000,000 |  |  |
Goodwill | 463,000,000 |  |  |  |  |  |  | 463,000,000 |  |  |
U.S. Data Center Operation [Member] | Consortium |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred | 1,103,000,000 |  |  |  |  |  |  | 1,103,000,000 |  |  |
Equity funded consideration | 577,000,000 |  |  |  |  |  |  | 577,000,000 |  |  |
Equity funded consideration from non-controlling interests | 413,000,000 |  |  |  |  |  |  | 413,000,000 |  |  |
Asset level debt raised | $ 526,000,000 |  |  |  |  |  |  | 526,000,000 |  |  |
Rayalseema Expressway Limited [Domain] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 26.00% |  |  |  |  |  |  |  |  |
Consideration transferred |  | $ 5,000,000 |  |  |  |  |  |  |  |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  |  | 1,000,000 |  |  |
Revenues |  |  |  |  |  |  |  | 2,000,000 |  |  |
Net income (loss) |  |  |  |  |  |  |  | 0 |  |  |
Cash |  | 3,000,000 |  |  |  |  |  |  |  |  |
Contingent consideration, acquisition-date fair value |  | 2,000,000 |  |  |  |  |  |  |  |  |
Rayalseema Expressway Limited [Domain] | Consortium |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  | 16,000,000 |  |  |  |  |  |  |  |  |
Cash |  | 10,000,000 |  |  |  |  |  |  |  |  |
Contingent consideration, acquisition-date fair value |  | $ 6,000,000 |  |  |  |  |  |  |  |  |
North American Residential Energy Infrastructure Operation [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 30.00% |  |  |  |  |  |  |  |
Consideration transferred |  |  | $ 723,000,000 |  |  |  |  |  |  |  |
Equity funded consideration |  |  | 427,000,000 |  |  |  |  |  |  |  |
Asset level debt raised |  |  | 64,000,000 |  |  |  |  |  |  |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  |  | 4,000,000 |  |  |
Revenues |  |  |  |  |  |  |  | 192,000,000 |  |  |
Net income (loss) |  |  |  |  |  |  |  | 5,000,000 |  |  |
Cash |  |  | 491,000,000 |  |  |  |  |  |  |  |
Goodwill expected to be deductible for tax purposes |  |  | 0 |  |  |  |  |  |  |  |
Goodwill |  |  | 1,260,000,000 |  |  |  |  |  |  |  |
North American Residential Energy Infrastructure Operation [Member] | Consortium |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | 2,400,000,000 |  |  |  |  |  |  |  |
Equity funded consideration |  |  | 2,000,000,000 |  |  |  |  |  |  |  |
Asset level debt raised |  |  | $ 216,000,000 |  |  |  |  |  |  |  |
Western Canadian Natural Gas Gathering and Processing Operation [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  | 29.00% |  |  |  |  |  |  |
Consideration transferred |  |  |  | $ 559,000,000 |  |  |  |  |  |  |
Equity funded consideration |  |  |  | 281,000,000 |  |  |  |  |  |  |
Asset level debt raised |  |  |  | 278,000,000 |  |  |  |  |  |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  |  | 3,000,000 |  |  |
Revenues |  |  |  |  |  |  |  | 61,000,000 |  |  |
Net income (loss) |  |  |  |  |  |  |  | 4,000,000 |  |  |
Cash |  |  |  | 559,000,000 |  |  |  |  |  |  |
Goodwill expected to be deductible for tax purposes |  |  |  | 0 |  |  |  |  |  |  |
Goodwill |  |  |  | 524,000,000 |  |  |  |  |  |  |
Western Canadian Natural Gas Gathering and Processing Operation [Member] | Consortium |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  | 2,000,000,000 |  |  |  |  |  |  |
Equity funded consideration |  |  |  | 982,000,000 |  |  |  |  |  |  |
Asset level debt raised |  |  |  | $ 974,000,000 |  |  |  |  |  |  |
Simhapuri Expressway Limited [Domain] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  | 29.00% |  |  |  |  |  |
Consideration transferred |  |  |  |  | $ 53,000,000 |  |  |  |  |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  |  | 1,000,000 |  |  |
Revenues |  |  |  |  |  |  |  | 15,000,000 |  |  |
Net income (loss) |  |  |  |  |  |  |  | (8,000,000) |  |  |
Cash |  |  |  |  | 53,000,000 |  |  |  |  |  |
Goodwill expected to be deductible for tax purposes |  |  |  |  | 0 |  |  |  |  |  |
Increase through business combinations, deferred tax liability |  |  |  |  | 37,000,000 |  |  |  |  |  |
Goodwill |  |  |  |  | 37,000,000 |  |  |  |  |  |
Goodwill not deductible tax purposes |  |  |  |  | 0 |  |  |  |  |  |
Simhapuri Expressway Limited [Domain] | Consortium |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  | $ 182,000,000 |  |  |  |  |  |
Colombian Gas Distribution Operation [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  | 16.00% |  |  |  |  |
Consideration transferred |  |  |  |  |  | $ 150,000,000 |  |  |  |  |
Equity funded consideration |  |  |  |  |  | 88,000,000 |  |  |  |  |
Asset level debt raised |  |  |  |  |  | 62,000,000 |  |  |  |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  |  | 2,000,000 |  |  |
Revenues |  |  |  |  |  |  |  | 516,000,000 |  |  |
Net income (loss) |  |  |  |  |  |  |  | 41,000,000 |  |  |
Cash |  |  |  |  |  | 118,000,000 |  |  |  |  |
Goodwill expected to be deductible for tax purposes |  |  |  |  |  | 0 |  |  |  |  |
Goodwill |  |  |  |  |  | $ 621,000,000 |  |  |  |  |
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 |  |  |  |  |
Colombian Gas Distribution Operation [Member] | Consortium |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | 522,000,000 |  |  |  |  |
Equity funded consideration |  |  |  |  |  | 309,000,000 |  |  |  |  |
Asset level debt raised |  |  |  |  |  | $ 213,000,000 |  |  |  |  |
Brazilian regulated gas transmission operation |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  | 28.00% |  |  |  |
Consideration transferred |  |  |  |  |  |  | $ 1,568,000,000 |  |  |  |
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  |  |  | $ 8,000,000 |  |
Cash |  |  |  |  |  |  | 1,306,000,000 |  |  |  |
Goodwill expected to be deductible for tax purposes |  |  |  |  |  |  | 0 |  |  |  |
Increase through business combinations, deferred tax liability |  |  |  |  |  |  | 893,000,000 |  |  |  |
Goodwill |  |  |  |  |  |  | 804,000,000 |  |  |  |
Deferred consideration, acquisition-date fair value |  |  |  |  |  |  | $ 262,000,000 |  |  |  |
Deferred consideration, annual interest accrual |  |  |  |  |  |  | 3.35% |  |  |  |
Period of payable from close of transaction |  |  |  |  |  |  | 5 years |  |  |  |
Goodwill not deductible tax purposes |  |  |  |  |  |  | $ 0 |  |  |  |
Brazilian regulated gas transmission operation | Consortium |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  | 5,100,000,000 |  |  |  |
Cash |  |  |  |  |  |  | 4,200,000,000 |  |  |  |
Deferred consideration, acquisition-date fair value |  |  |  |  |  |  | $ 900,000,000 |  |  |  |
Brazilian Regulated Gas Transmission Operation and other insignificant transactions |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Pro forma revenue |  |  |  |  |  |  |  | 6,328,000,000 |  |  |
Pro forma net income |  |  |  |  |  |  |  | 819,000,000 |  |  |
Non-controlling Interest - Exchange LP Units, equity [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Unit issuance |  |  |  |  |  |  |  | $ 232,000,000 |  |  |
Non-controlling Interest - Exchange LP Units, equity [Member] | North American Residential Energy Infrastructure Operation [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |
Exchange LP unit conversion, shares |  |  | 0.5509 |  |  |  |  |  |  |  |
Unit issuance |  |  | $ 232,000,000 |  |  |  |  |  |  |  |
Issued for cash |  |  | 5,700,000 |  |  |  |  |  |  |  |
[1] | Certain net income allocations have been reclassified to provide comparability with the current year consolidated statements of partnership capital.

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