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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Cash Flow Activities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating $ 1,362 $ 1,481 $ 753
Cash Flow Activities, Investing (5,564) (5,721) (1,058)
Cash Flow Activities, Financing 4,418 3,814 899
Non-Wholly Owned Subsidiaries      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 1,245 1,364 681
Cash Flow Activities, Investing (5,486) (5,621) (995)
Cash Flow Activities, Financing 4,451 3,840 901
U.K. regulated distribution operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 226 220 244
Cash Flow Activities, Investing (413) (343) (487)
Cash Flow Activities, Financing 179 129 245
Australian regulated terminal operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 85 96 128
Cash Flow Activities, Investing (21) (9) (22)
Cash Flow Activities, Financing (63) (87) (106)
Colombian regulated distribution operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 11 7 17
Cash Flow Activities, Investing (26) (22) (18)
Cash Flow Activities, Financing 0 26 0
Brazilian regulated gas transmission operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 868 819  
Cash Flow Activities, Investing (26) 83  
Cash Flow Activities, Financing (792) (839)  
Colombian Gas Distribution Operation [Member]      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 94 0  
Cash Flow Activities, Investing (217) 0  
Cash Flow Activities, Financing 205 0  
U.K. port operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 27 46 33
Cash Flow Activities, Investing (17) (40) (24)
Cash Flow Activities, Financing (8) (10) (14)
Australian port operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 42 37 7
Cash Flow Activities, Investing (68) (39) (99)
Cash Flow Activities, Financing 22 12 154
Chilean toll roads      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 74 56 63
Cash Flow Activities, Investing (1) (5) (1)
Cash Flow Activities, Financing (82) (88) (99)
Brazilian toll roads      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating     2
Cash Flow Activities, Investing     (70)
Cash Flow Activities, Financing     70
Peruvian toll roads      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 91 46 29
Cash Flow Activities, Investing (33) (67) 25
Cash Flow Activities, Financing 0 0 1
Indian toll roads      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 18 30 (7)
Cash Flow Activities, Investing (184) (7) 28
Cash Flow Activities, Financing 209 (22) (10)
North American gas storage operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 0 55 (12)
Cash Flow Activities, Investing (8) (9) 6
Cash Flow Activities, Financing 7 (76) 46
Canadian district energy operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 39 26 27
Cash Flow Activities, Investing (42) (82) (18)
Cash Flow Activities, Financing (45) 102 (13)
U.S. district energy operation      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 24 24 26
Cash Flow Activities, Investing (16) 8 (33)
Cash Flow Activities, Financing (18) (28) 9
Western Canadian Natural Gas Gathering and Processing Operation [Member]      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 48 0  
Cash Flow Activities, Investing (1,923) 0  
Cash Flow Activities, Financing 1,910 0  
North American Residential Energy Infrastructure Operation [Member]      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating 16 0  
Cash Flow Activities, Investing (2,182) 0  
Cash Flow Activities, Financing 2,188 0  
U.S. Data Center Operation [Member]      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating (1) 0  
Cash Flow Activities, Investing (1,103) 0  
Cash Flow Activities, Financing 1,118 0  
Holding LP and other      
Disclosure of subsidiaries [line items]      
Cash Flow Activities, Operating (417) (98) 124
Cash Flow Activities, Investing 794 (5,089) (282)
Cash Flow Activities, Financing $ (379) $ 4,721 $ 618