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CAPITAL MANAGEMENT (Tables)
 12 Months Ended
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