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ACQUISITION OF BUSINESSES - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 01, 2018
Dec. 31, 2017
Apr. 04, 2017
Fair value of assets and liabilities acquired        
Goodwill $ 1,949   $ 1,301  
Colombian Gas Distribution Operation [Member]        
Consideration transferred        
Cash   $ 118    
Business combinations, pre-existing interest, equity   32    
Total consideration   150    
Fair value of assets and liabilities acquired        
Cash and cash equivalents   21    
Accounts receivable and other   275    
Property, plant and equipment   487    
Intangible assets   17    
Goodwill   770    
Accounts payable and other   (238)    
Deferred income tax and other liabilities   (83)    
Non-recourse borrowings   (185)    
Net assets acquired before non-controlling interest   1,064    
Non-controlling interest   (914)    
Net assets acquired   $ 150    
Aggregated individually immaterial business combinations        
Consideration transferred        
Cash     9  
Deferred consideration, acquisition-date fair value     21  
Total consideration     30  
Fair value of assets and liabilities acquired        
Accounts receivable and other     28  
Property, plant and equipment     104  
Goodwill     14  
Deferred income tax and other liabilities     (30)  
Non-recourse borrowings     (30)  
Net assets acquired before non-controlling interest     86  
Non-controlling interest     (56)  
Net assets acquired     $ 30  
Brazilian Regulated Gas Transmission Operation [Member]        
Consideration transferred        
Cash       $ 1,306
Deferred consideration, acquisition-date fair value       262
Total consideration       1,568
Fair value of assets and liabilities acquired        
Cash and cash equivalents       89
Accounts receivable and other       317
Intangible assets       5,515
Goodwill       804
Accounts payable and other       (202)
Deferred income tax and other liabilities       (946)
Net assets acquired before non-controlling interest       5,577
Non-controlling interest       (4,009)
Net assets acquired       $ 1,568