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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2017
Prospective Adoption of New Accounting Pronouncements [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | [1] |  |  |  | $ 16
Customer order backlog |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Useful life of intangible asset |  | 15 years |  |  |
Assets [member] |  |  |  |  |
Prospective Adoption of New Accounting Pronouncements [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | $ 25 |
Liabilities [member] |  |  |  |  |
Prospective Adoption of New Accounting Pronouncements [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | 9 |
Equity [member] |  |  |  |  |
Prospective Adoption of New Accounting Pronouncements [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 0 | $ 16 |
Assets and liabilities [member] | Bottom of range |  |  |  |  |
Prospective Adoption of New Accounting Pronouncements [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | 400 |  |
Assets and liabilities [member] | Top of range |  |  |  |  |
Prospective Adoption of New Accounting Pronouncements [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  | $ 600 |  |
Australian regulated terminal operation |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Remaining amortisation period of intangible asset |  | 82 years |  |  |
Chilean toll roads |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Remaining amortisation period of intangible asset |  | 15 years |  |  |
Indian toll roads |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Remaining amortisation period of intangible asset |  | 15 years |  |  |
Peruvian toll roads |  |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |  |
Remaining amortisation period of intangible asset |  | 24 years |  |  |
Buildings | Top of range |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Estimated useful lives |  | 75 years |  |  |
Transmission stations, towers and related fixtures | Top of range |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Estimated useful lives |  | 40 years |  |  |
Leasehold improvements | Top of range |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Estimated useful lives |  | 50 years |  |  |
Plant and equipment | Top of range |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Estimated useful lives |  | 40 years |  |  |
Network systems | Top of range |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Estimated useful lives |  | 65 years |  |  |
Track | Top of range |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Estimated useful lives |  | 40 years |  |  |
District energy systems | Top of range |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Estimated useful lives |  | 50 years |  |  |
Gas storage assets | Top of range |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Estimated useful lives |  | 50 years |  |  |
[1] | Refer to Note 3 Significant Accounting Policies.

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