XML 70 R55.htm IDEA: XBRL DOCUMENT v3.10.0.1
INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 15, 2018
Dec. 31, 2017
Aug. 31, 2017
May 31, 2017
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disclosure Of Associates And Joint Ventures [Line Items]                    
Proceeds from sales of investments accounted for using equity method         $ 0   $ 0 $ 1,289,000,000 $ 0  
Gain (Loss) on Disposition of Business         $ 0   $ 0 338,000,000 $ 0  
Decrease (Increase) in Investment in Associates and Joint Ventures From Disposition Of Interests               951,000,000   $ 177,000,000
Acquisitions               72,000,000   620,000,000
Chilean electricity transmission operation [Member]                    
Disclosure Of Associates And Joint Ventures [Line Items]                    
Proceeds from sales of investments accounted for using equity method $ 1,300,000,000                  
Gain (Loss) on Disposition of Business           $ 338,000,000        
Gain (Loss) on Disposition of Business, Net of Tax           209,000,000        
Reclassification adjustments on exchange differences on translation, net of tax           $ 35,000,000        
Brazilian toll roads                    
Disclosure Of Associates And Joint Ventures [Line Items]                    
Gain (loss) on investment     $ 0              
Decrease (Increase) in Investment in Associates and Joint Ventures From Disposition Of Interests                   177,000,000
Acquisitions               $ 0   $ 349,000,000
Ownership Interest   45.00%               8.00%
North American natural gas transmission operation                    
Disclosure Of Associates And Joint Ventures [Line Items]                    
Acquisitions       $ 200,000,000