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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Cash Flow Activities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating $ 1,481 $ 753 $ 632
Cash Flow Activities, Investing (5,721) (1,058) (2,346)
Cash Flow Activities, Financing 3,814 899 1,764
Non-Wholly Owned Subsidiaries      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 1,364 681 506
Cash Flow Activities, Investing (5,621) (995) (1,031)
Cash Flow Activities, Financing 3,840 901 564
U.K. regulated distribution      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 220 244 164
Cash Flow Activities, Investing (343) (487) (242)
Cash Flow Activities, Financing 129 245 92
Australian regulated terminal      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 96 128 103
Cash Flow Activities, Investing (9) (22) (37)
Cash Flow Activities, Financing (87) (106) (67)
New England electricity transmission operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating     2
Cash Flow Activities, Investing     0
Cash Flow Activities, Financing     (2)
Colombian regulated distribution      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 7 17 16
Cash Flow Activities, Investing (22) (18) (6)
Cash Flow Activities, Financing 26 0 (7)
Brazilian regulated gas transmission operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 819 0  
Cash Flow Activities, Investing 83 0  
Cash Flow Activities, Financing (839) 0  
U.K. port operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 46 33 19
Cash Flow Activities, Investing (40) (24) (66)
Cash Flow Activities, Financing (10) (14) 61
Australian port operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 37 7 0
Cash Flow Activities, Investing (39) (99) 0
Cash Flow Activities, Financing 12 154 0
Chilean toll roads      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 56 63 70
Cash Flow Activities, Investing (5) (1) 0
Cash Flow Activities, Financing (88) (99) (38)
Brazilian toll roads      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 0 2  
Cash Flow Activities, Investing 0 (70)  
Cash Flow Activities, Financing 0 70  
Peruvian toll roads      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 46 29  
Cash Flow Activities, Investing (67) 25  
Cash Flow Activities, Financing 0 1  
Indian toll roads      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 30 (7)  
Cash Flow Activities, Investing (7) 28  
Cash Flow Activities, Financing (22) (10)  
North American gas storage operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 55 (12) (3)
Cash Flow Activities, Investing (9) 6 (1)
Cash Flow Activities, Financing (76) 46 1
Canadian district energy operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 26 27 22
Cash Flow Activities, Investing (82) (18) (16)
Cash Flow Activities, Financing 102 (13) (23)
U.S. district energy operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 24 26 21
Cash Flow Activities, Investing 8 (33) (13)
Cash Flow Activities, Financing (28) 9 (7)
Holding LP and other      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating (98) 124 92
Cash Flow Activities, Investing (5,089) (282) (650)
Cash Flow Activities, Financing $ 4,721 $ 618 $ 554