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INTEREST EXPENSE
 12 Months Ended
Dec. 31, 2017
Analysis of income and expense [abstract]  
INTEREST EXPENSE
INTEREST EXPENSE
US$ MILLIONS
 
2017
 
2016
 
2015
Interest on corporate facility
 
$
12

 
$
12

 
$
5

Interest on corporate debt
 
51

 
39

 
22

Interest on non-recourse borrowings
 
361

 
338

 
334

Other financing fees
 
4

 
3

 
6

 
 
$
428

 
$
392

 
$
367