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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | $ 1,362 | $ 1,481 | $ 753
Cash used by investing activities | (5,564) | (5,721) | (1,058)
Cash from financing activities | 4,418 | 3,814 | 899
Change during the year | 216 | (426) | 594
Utilities |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | 380 | 433 | 352
Cash used by investing activities | 6,189 | (803) | (311)
Cash from financing activities | (6,716) | 494 | (21)
Change during the year | (147) | 124 | 20
Other Ownership Interests | (106) | 102 | 12
Partnership's Share | (41) | 22 | 8
Transport |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | 776 | 1,000 | 675
Cash used by investing activities | (1,018) | (1,673) | (1,783)
Cash from financing activities | 369 | 1,121 | 969
Change during the year | 127 | 448 | (139)
Other Ownership Interests | 77 | 370 | (122)
Partnership's Share | 50 | 78 | (17)
Energy |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | 320 | 261 | 152
Cash used by investing activities | (288) | (171) | (174)
Cash from financing activities | (46) | (77) | 15
Change during the year | (14) | 13 | (7)
Other Ownership Interests | (10) | 6 | (4)
Partnership's Share | (4) | 7 | (3)
Data Infrastructure [Member] |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | 323 | 338 | 325
Cash used by investing activities | (305) | (226) | (323)
Cash from financing activities | 19 | (57) | (83)
Change during the year | 37 | 55 | (81)
Other Ownership Interests | 29 | 44 | (63)
Partnership's Share | 8 | 11 | (18)
Corporate |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | 7 | 1 |
Cash used by investing activities | (7) | (10) |
Cash from financing activities | 0 | 4 |
Change during the year | 0 | (5) |
Other Ownership Interests | 0 | (3) |
Partnership's Share | 0 | (2) |
Associates and Joint Ventures |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |
Cash from operating activities | 1,806 | 2,033 | 1,504
Cash used by investing activities | 4,571 | (2,883) | (2,591)
Cash from financing activities | (6,374) | 1,485 | 880
Change during the year | 3 | 635 | (207)
Other Ownership Interests | (10) | 519 | (177)
Partnership's Share | $ 13 | $ 116 | $ (30)

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