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CAPITAL MANAGEMENT (Tables)
 6 Months Ended
Jun. 30, 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.
 
As of
US$ MILLIONS
June 30, 2018
 
December 31, 2017
Partnership Capital
$
12,276

 
$
13,474

Remove impact of the following items since inception:
 
 
 
Non-controlling interest - in operating subsidiaries
(5,125
)
 
(5,875
)
Deficit
842

 
1,366

Accumulated other comprehensive income
(120
)
 
(1,257
)
Ownership changes
(109
)
 
(109
)
Invested Capital
$
7,764

 
$
7,599

The following table presents the change in Invested Capital during the three and six-month periods ended June 30, 2018:
 
For the three-month
period ended June 30
 
For the six-month
period ended June 30
US$ MILLIONS
2018

 
2017

 
2018

 
2017

Opening balance
$
7,760

 
$
6,613

 
$
7,599

 
$
6,387

Issuance of preferred units
—

 
—

 
157

 
220

Issuance of limited partnership units and redeemable partnership units
4

 
5

 
8

 
11

Ending balance
$
7,764

 
$
6,618

 
$
7,764

 
$
6,618

Weighted Average Invested Capital
$
7,760

 
$
6,613

 
$
7,738

 
$
6,578