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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Cash Flow Activities (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 14, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   $ 2,143 $ 1,362 $ 1,481
Cash Flow Activities, Investing   (11,372) (5,564) (5,721)
Cash Flow Activities, Financing   9,542 4,418 3,814
Disposal of investments in associates and joint ventures   135 1,289 0
Non-Wholly Owned Subsidiaries        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   2,110 1,245 1,364
Cash Flow Activities, Investing   (11,125) (5,486) (5,621)
Cash Flow Activities, Financing   9,337 4,451 3,840
U.K. regulated distribution operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   271 226 220
Cash Flow Activities, Investing   (416) (413) (343)
Cash Flow Activities, Financing   147 179 129
Australian regulated terminal operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   91 85 96
Cash Flow Activities, Investing   (23) (21) (9)
Cash Flow Activities, Financing   (55) (63) (87)
Colombian regulated distribution operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   26 11 7
Cash Flow Activities, Investing   (24) (26) (22)
Cash Flow Activities, Financing   (4) 0 26
Brazilian regulated gas transmission operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   839 868 819
Cash Flow Activities, Investing   (21) (26) 83
Cash Flow Activities, Financing   (702) (792) (839)
Colombian natural gas distribution operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   72 94  
Cash Flow Activities, Investing   (38) (217)  
Cash Flow Activities, Financing   (73) 205  
Brazilian electricity transmission operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   22 0  
Cash Flow Activities, Investing   (4) 0  
Cash Flow Activities, Financing   (6) 0  
North American rail operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   0 0  
Cash Flow Activities, Investing   (6,460) 0  
Cash Flow Activities, Financing   6,578 0  
U.K. ports operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   27 27 46
Cash Flow Activities, Investing   (43) (17) (40)
Cash Flow Activities, Financing   9 (8) (10)
Australian port operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   52 42 37
Cash Flow Activities, Investing   (45) (68) (39)
Cash Flow Activities, Financing   (10) 22 12
Chilean toll roads        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   62 74 56
Cash Flow Activities, Investing   (2) (1) (5)
Cash Flow Activities, Financing   (55) (82) (88)
Peruvian toll roads        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   47 91 46
Cash Flow Activities, Investing   (39) (33) (67)
Cash Flow Activities, Financing   0 0 0
Indian toll roads        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   7 18 30
Cash Flow Activities, Investing   (9) (184) (7)
Cash Flow Activities, Financing   (29) 209 (22)
North American gas storage operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   83 0 55
Cash Flow Activities, Investing   (10) (8) (9)
Cash Flow Activities, Financing   (63) 7 (76)
Canadian district energy operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   53 39 26
Cash Flow Activities, Investing   (68) (42) (82)
Cash Flow Activities, Financing   14 (45) 102
U.S. district energy operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   22 24 24
Cash Flow Activities, Investing   (29) (16) 8
Cash Flow Activities, Financing   2 (18) (28)
Western Canadian natural gas gathering and processing operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   92 48  
Cash Flow Activities, Investing   (1,396) (1,923)  
Cash Flow Activities, Financing   1,339 1,910  
North American residential energy infrastructure operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   128 16  
Cash Flow Activities, Investing   (228) (2,182)  
Cash Flow Activities, Financing   87 2,188  
Indian natural gas operations        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   208 0  
Cash Flow Activities, Investing   (1,950) 0  
Cash Flow Activities, Financing   1,746 0  
U.S. data center operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   51 (1)  
Cash Flow Activities, Investing   (6) (1,103)  
Cash Flow Activities, Financing   (35) 1,118  
Australian Data Center Operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   0 0  
Cash Flow Activities, Investing   (277) 0  
Cash Flow Activities, Financing   286 0  
U.K. telecom towers operation        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   3 0  
Cash Flow Activities, Investing   (280) 0  
Cash Flow Activities, Financing   289 0  
Holding LP and other        
Disclosure of subsidiaries [line items]        
Cash Flow Activities, Operating   (46) (417) (98)
Cash Flow Activities, Investing   243 794 (5,089)
Cash Flow Activities, Financing   $ (128) $ (379) $ 4,721
Classification of assets as held for sale | Colombian regulated distribution operation        
Disclosure of subsidiaries [line items]        
Ownership and voting Interest 17.00%      
Disposal of investments in associates and joint ventures $ 90