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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.