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RETIREMENT BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2018
Employee Benefits [Abstract]  
Disclosure of defined benefit plans
US$ MILLIONS
 
2018
 
2017
Plan assets
 
$
287

 
$
228

Less accrued benefit obligation
 
(368
)
 
(328
)
Accrued benefit liability (1)
 
$
(81
)
 
$
(100
)

 
(1)
Presented within ‘Accounts payable and other’ of the consolidated statements of financial position.