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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Income Statement Impact of Investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |
Revenues | $ 3,535 | $ 2,115 |  | $ 1,855 |
Net income | 574 | 528 | [1] | 391 | [1]
OCI | 323 | 576 |  | (202) |
Comprehensive income | 897 | 1,104 |  | 189 |
Associates and Joint Ventures |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |
Revenues | 6,469 | 4,818 |  | 4,312 |
Net income | 378 | 570 |  | 326 |
OCI | 1,750 | 2,155 |  | (1,647) |
Comprehensive income | 2,128 | 2,725 |  | (1,321) |
Attributable to Other Ownership Interests | 1,665 | 2,033 |  | (977) |
Attributable to Partnership's Share | 463 | 692 |  | (344) |
Brazilian toll roads |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |
Revenues | 928 | 766 |  | 758 |
Net income | 95 | 185 |  | (12) |
OCI | (39) | 382 |  | (1,118) |
Comprehensive income | 56 | 567 |  | (1,130) |
Attributable to Other Ownership Interests | 19 | 275 |  | (778) |
Attributable to Partnership's Share | 37 | 292 |  | (352) |
North American natural gas transmission operation |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |
Revenues | 681 | 573 |  | 522 |
Net income | 15 | 133 |  | (29) |
OCI | (1) | 5 |  | 0 |
Comprehensive income | 14 | 138 |  | (29) |
Attributable to Other Ownership Interests | 7 | 69 |  | (19) |
Attributable to Partnership's Share | 7 | 69 |  | (10) |
Chilean electricity transmission operation |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |
Revenues | 441 | 433 |  | 432 |
Net income | 37 | 38 |  | 75 |
OCI | 806 | 217 |  | (145) |
Comprehensive income | 843 | 255 |  | (70) |
Attributable to Other Ownership Interests | 609 | 184 |  | (51) |
Attributable to Partnership's Share | 234 | 71 |  | (19) |
European telecommunications infrastructure operation |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |
Revenues | 783 | 767 |  | 579 |
Net income | 58 | 121 |  | 62 |
OCI | 435 | 376 |  | 72 |
Comprehensive income | 493 | 497 |  | 134 |
Attributable to Other Ownership Interests | 409 | 393 |  | 104 |
Attributable to Partnership's Share | 84 | 104 |  | 30 |
Brazilian rail business |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |
Revenues | 1,409 | 1,024 |  | 1,074 |
Net income | 56 | 70 |  | 136 |
OCI | 490 | 976 |  | (668) |
Comprehensive income | 546 | 1,046 |  | (532) |
Attributable to Other Ownership Interests | 486 | 931 |  | (474) |
Attributable to Partnership's Share | 60 | 115 |  | (58) |
Australian port operation |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |
Revenues | 418 | 164 |  |  |
Net income | 19 | (31) |  |  |
OCI | 78 | (81) |  |  |
Comprehensive income | 97 | (112) |  |  |
Attributable to Other Ownership Interests | 80 | (97) |  |  |
Attributable to Partnership's Share | 17 | (15) |  |  |
Other |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |
Revenues | 1,809 | 1,091 |  | 947 |
Net income | 98 | 54 |  | 94 |
OCI | (19) | 280 |  | 212 |
Comprehensive income | 79 | 334 |  | 306 |
Attributable to Other Ownership Interests | 55 | 278 |  | 241 |
Attributable to Partnership's Share | $ 24 | $ 56 |  | $ 65 |
[1] | Certain net income allocations have been reclassified to provide comparability with the current year consolidated statements of partnership capital.

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