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CAPITAL MANAGEMENT (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Capital Management [Abstract] |
Schedule of invested capital | We define Invested Capital as partnership capital removing the impact of the following items: non-controlling interest - in operating subsidiaries, retained earnings or deficit, accumulated other comprehensive income and ownership changes.
1. | Estimated based on the discounted cash flow models which we utilize in order to value and measure the performance of our operations.
US$ MILLIONS | 2017 |  | 2016
Partnership Capital | $ | 13,474 |  |  | $ | 9,644 |
Remove impact of the following items since inception: |  |  |
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 |
The following table presents the change in Invested Capital during year ended December 31, 2017:
US$ MILLIONS | 2017 |  | 2016
Opening balance | $ | 6,387 |  |  | $ | 5,452 |
Issuance of preferred units | 220 |  |  | 186 |
Issuance of limited partnership units and redeemable partnership units | 992 |  |  | 749 |
Ending balance | $ | 7,599 |  |  | $ | 6,387 |
Weighted Average Invested Capital | $ | 6,885 |  |  | $ | 5,592 |

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