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BORROWINGS (Tables)
 6 Months Ended
Jun. 30, 2021
Financial Instruments [Abstract]  
Disclosure of detailed information about borrowings
As of
US$ MILLIONSJune 30, 2021December 31, 2020
Current$12 $11 
Non-current3,728 3,466 
Total$3,740 $3,477