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SIGNIFICANT ACCOUNTING POLICIES (Details)
 12 Months Ended
Dec. 31, 2017
Customer order backlog  
Disclosure of detailed information about intangible assets [line items]  
Useful life of intangible asset 15 years
Australian regulated terminal  
Disclosure of detailed information about intangible assets [line items]  
Remaining amortisation period of intangible asset 83 years
Chilean toll roads  
Disclosure of detailed information about intangible assets [line items]  
Remaining amortisation period of intangible asset 16 years
Indian toll roads  
Disclosure of detailed information about intangible assets [line items]  
Remaining amortisation period of intangible asset 6 years
Peruvian toll roads  
Disclosure of detailed information about intangible assets [line items]  
Remaining amortisation period of intangible asset 25 years
Buildings | Top of range  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives 70 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 60 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