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PARTIAL DISPOSITION OF OUR INTEREST IN CHILEAN TOLL ROAD BUSINESS - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 07, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure Of Associates And Joint Ventures [Line Items]          
Proceeds from sales of investments accounted for using equity method   $ 135 $ 0 $ 135 $ 1,289
Gain (Loss) on Disposition of Business   $ 0 $ 0 0 $ 338
Chilean toll roads          
Disclosure Of Associates And Joint Ventures [Line Items]          
Ownership and Voting Interest Held In Associate And Joint Venture 17.00%        
Proceeds from sales of investments accounted for using equity method $ 365        
Dividends received 200        
Partnership's share of proceeds from sales of investments accounted for using equity method $ 165        
Gain (Loss) on Disposition of Business       354  
Reclassification adjustments on exchange differences on translation, net of tax       $ 38