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PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT - Cost Model (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Utilities    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment, revalued assets, at cost $ 3,407 $ 2,961
Transport    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment, revalued assets, at cost 1,741 1,970
Energy    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment, revalued assets, at cost 4,189 2,246
Data Infrastructure [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment, revalued assets, at cost $ 444 $ 0