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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

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