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INSURANCE CONTRACTS (Tables)
 12 Months Ended
Dec. 31, 2019
Insurance Contracts [Abstract]  
Schedule of liabilities under insurance contracts
The following table presents movement in unearned premium reserve:
(US$ MILLIONS)
 
2019
Unearned premium reserves, beginning of year
 
$
—

Acquisitions through business combinations
 
1,603

Premiums written during the year
 
26

Premiums earned during the year
 
(28
)
Foreign currency translation
 
24

Unearned premium reserves, end of year
 
$
1,625

Loss reserves comprise of the following:
(US$ MILLIONS)
 
2019
Case reserves
 
$
69

Incurred but not reported reserves
 
30

Discounting
 
(1
)
Provisions for adverse deviation
 
7

Total loss reserves
 
$
105

The following table presents movement in loss reserves and the impact on losses on claims:
(US$ MILLIONS)
 
2019
Loss reserves, beginning of year
 
$
—

Acquisitions through business combinations
 
104

Claims paid during the year
 
(5
)
Losses on claims related to the current year
 
5

Favorable development on losses on claims related to prior years
 
—

Foreign currency translation
 
1

Loss reserves, end of year
 
$
105