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SIGNIFICANT ACCOUNTING POLICIES SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jan. 01, 2019
Jun. 30, 2019
Jun. 30, 2019
Disclosure of initial application of standards or interpretations [line items]      
Statement that lessee accounts for short-term leases using recognition exemption     Payments associated with short-term leases and leases of low-value assets are recognized on a straight-line basis as an expense in profit or loss. Short-term leases are leases with a lease term of 12 months or less. Low-value assets are generally comprised of IT-equipment and small items of office furniture.
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16 5.83%    
Change in net income   $ 0  
IFRS 16 [Member]      
Disclosure of initial application of standards or interpretations [line items]      
Additions to right-of-use assets $ 85    
Increase (decrease) in deferred tax liability (asset)   0  
Increase in finance lease liability 92    
Change in deficit $ 0    
Change in net income   $ 0 $ 1