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CAPITAL MANAGEMENT (Tables)
 12 Months Ended
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