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CAPITAL MANAGEMENT - Invested Capital (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of Capital Management [Abstract] |  |  |  |
Total partnership capital | $ 13,474 | $ 9,644 | $ 7,176 | $ 6,322
Non-controlling interest - in operating subsidiaries | (5,875) | (2,771) |  |
Deficit | 1,366 | 697 |  |
Accumulated other comprehensive income | (1,257) | (1,074) |  |
Ownership changes | (109) | (109) |  |
Invested Capital | $ 7,599 | $ 6,387 | $ 5,452 |
Bottom of range |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |
Targeted returns on invested capital | 12.00% |  |  |
Top of range |  |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |  |
Targeted returns on invested capital | 15.00% |  |  |

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