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ACQUISITION OF BUSINESSES - Additional Information (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 01, 2018
Apr. 04, 2017
Jun. 30, 2018
Dec. 31, 2017
Disclosure of detailed information about business combination [line items]        
Goodwill     $ 1,949,000,000 $ 1,301,000,000
Colombian Gas Distribution Operation [Member]        
Disclosure of detailed information about business combination [line items]        
Profit (loss)     571,000,000  
Proportion of ownership interest in subsidiary 16.00%      
Total consideration $ 150,000,000      
Equity funded consideration 88,000,000      
Cash $ 118,000,000      
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination     2,000,000  
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  
Increase through business combinations, deferred tax liability 76,000,000      
Goodwill not deductible tax purposes 76,000,000      
Goodwill 770,000,000      
Revenue of combined entity as if combination occurred at beginning of period     $ 2,457,000,000  
Goodwill expected to be deductible for tax purposes 0      
Colombian Gas Distribution Operation [Member] | Consortium        
Disclosure of detailed information about business combination [line items]        
Total consideration 522,000,000      
Equity funded consideration $ 309,000,000      
Brazilian Regulated Gas Transmission Operation [Member]        
Disclosure of detailed information about business combination [line items]        
Proportion of ownership interest in subsidiary   28.00%    
Total consideration   $ 1,568,000,000    
Cash   1,306,000,000    
Deferred consideration   $ 262,000,000    
Period of payable from close of transaction   5 years    
Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination       8,000,000
Deferred consideration, annual interest accrual   3.35%    
Increase through business combinations, deferred tax liability   $ 893,000,000    
Goodwill   804,000,000    
Goodwill expected to be deductible for tax purposes   0    
Brazilian Regulated Gas Transmission Operation [Member] | Consortium        
Disclosure of detailed information about business combination [line items]        
Total consideration   5,100,000,000    
Cash   4,200,000,000    
Deferred consideration   $ 900,000,000    
Aggregated individually immaterial business combinations        
Disclosure of detailed information about business combination [line items]        
Total consideration       30,000,000
Cash       9,000,000
Deferred consideration       21,000,000
Goodwill       $ 14,000,000