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CAPITAL MANAGEMENT (Tables) | 12 Months Ended
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Dec. 31, 2018
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.
US$ MILLIONS | 2018 |  | 2017
Partnership Capital | $ | 14,668 |  |  | $ | 13,474 |
Remove impact of the following items since inception: |  |  |
Non-controlling interest - in operating subsidiaries | (7,303 | ) |  | (5,875 | )
Deficit | 1,228 |  |  | 1,366 |
Accumulated other comprehensive income | (328 | ) |  | (1,257 | )
Ownership changes | (109 | ) |  | (109 | )
Invested Capital | $ | 8,156 |  |  | $ | 7,599 |
The following table presents the change in Invested Capital during year ended December 31, 2018:
US$ MILLIONS | 2018 |  | 2017
Opening balance | $ | 7,599 |  |  | $ | 6,387 |
Issuance of preferred units, net of repurchases | 341 |  |  | 220 |
Repurchases of limited partnership units and redeemable partnership units, net of issuances | (16 | ) |  | 992 |
Issuance of Exchange LP Units | 232 |  |  | — |
Ending balance | $ | 8,156 |  |  | $ | 7,599 |
Weighted Average Invested Capital | $ | 7,858 |  |  | $ | 6,885 |

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