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RETIREMENT BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2017
Employee Benefits [Abstract]  
Disclosure of defined benefit plans
US$ MILLIONS
 
2017
 
2016
Plan assets
 
$
228

 
$
198

Less accrued benefit obligation
 
(328
)
 
(296
)
Accrued benefit liability
 
$
(100
)
 
$
(98
)