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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Cash Flows Impact of Investments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | $ 1,481 | $ 753 | $ 632
Cash used by investing activities | (5,721) | (1,058) | (2,346)
Cash from financing activities | 3,814 | 899 | 1,764
Change during the year | (426) | 594 | 50
Associates and Joint Ventures |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | 2,033 | 1,504 | 1,282
Cash used by investing activities | (2,883) | (2,591) | (1,932)
Cash from financing activities | 1,485 | 880 | 405
Change during the year | 635 | (207) | (245)
Other Ownership Interests | 519 | (177) | (163)
Partnership's Share | 116 | (30) | (82)
Brazilian toll roads |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | 345 | 249 | 194
Cash used by investing activities | (1,046) | (491) | (534)
Cash from financing activities | 800 | 212 | 59
Change during the year | 99 | (30) | (281)
Other Ownership Interests | 57 | (19) | (194)
Partnership's Share | 42 | (11) | (87)
North American natural gas transmission operation |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | 258 | 163 | 98
Cash used by investing activities | (169) | (170) | (157)
Cash from financing activities | (79) | 2 | 10
Change during the year | 10 | (5) | (49)
Other Ownership Interests | 5 | (2) | (32)
Partnership's Share | 5 | (3) | (17)
Chilean electricity transmission operation |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | 256 | 273 | 274
Cash used by investing activities | (240) | (207) | (122)
Cash from financing activities | 14 | (27) | (197)
Change during the year | 30 | 39 | (45)
Other Ownership Interests | 22 | 28 | (32)
Partnership's Share | 8 | 11 | (13)
European telecommunications infrastructure operation |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | 338 | 325 | 253
Cash used by investing activities | (226) | (323) | (101)
Cash from financing activities | (58) | (83) | (19)
Change during the year | 54 | (81) | 133
Other Ownership Interests | 43 | (64) | 106
Partnership's Share | 11 | (17) | 27
Brazilian rail business |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | 472 | 337 | 309
Cash used by investing activities | (458) | (780) | (929)
Cash from financing activities | 292 | 272 | 588
Change during the year | 306 | (171) | (32)
Other Ownership Interests | 272 | (152) | (29)
Partnership's Share | 34 | (19) | (3)
Australian port operation |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | 80 | 15 |
Cash used by investing activities | (15) | (391) |
Cash from financing activities | (22) | 433 |
Change during the year | 43 | 57 |
Other Ownership Interests | 40 | 47 |
Partnership's Share | 3 | 10 |
Other |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | 284 | 142 | 154
Cash used by investing activities | (729) | (229) | (89)
Cash from financing activities | 538 | 71 | (36)
Change during the year | 93 | (16) | 29
Other Ownership Interests | 80 | (15) | 18
Partnership's Share | $ 13 | $ (1) | $ 11

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