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FINANCIAL ASSETS
 6 Months Ended
Jun. 30, 2018
Financial Instruments [Abstract]  
FINANCIAL ASSETS
FINANCIAL ASSETS
(US$ MILLIONS)
 
June 30, 2018
 
December 31, 2017
Current
 
 
 
 
Marketable securities (1)
 
$
262

 
$
207

Restricted cash
 
77

 
68

Derivative contracts
 
99

 
75

Loans and notes receivable
 
46

 
11

Total current
 
$
484

 
$
361

Non-current
 
 
 
 
Marketable securities (1)
 
$
1

 
$
1

Restricted cash
 
7

 
11

Derivative contracts
 
61

 
7

Loans and notes receivable
 
179

 
150

Other financial assets (2)
 
214

 
254

Total non-current
 
$
462

 
$
423

____________________________________
(1) 
During the three and six month period ended June 30, 2018, the partnership recognized $nil and $nil (June 30, 2017: $6 million and $39 million) of net gains on disposition of marketable securities.    
(2) 
Other financial assets include secured debentures to homebuilding companies in our business services segment.