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PROPERTY, PLANT AND EQUIPMENT - Net Book Value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance $ 4,497 $ 3,677
Change in accounting policies(1)   3
Additions, net of disposals 364 420
Non-cash additions 3  
Depreciation expense (131) (113)
Fair value adjustments 215 347
Net foreign currency exchange differences 163 163
Ending balance 5,111 4,497
Gross carrying amount    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 3,696 3,141
Change in accounting policies(1)   3
Additions, net of disposals 358 413
Non-cash additions 6  
Depreciation expense 0 0
Fair value adjustments 0 0
Net foreign currency exchange differences 137 139
Ending balance 4,197 3,696
Accumulated depreciation    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance (567) (437)
Change in accounting policies(1)   0
Additions, net of disposals 6 7
Non-cash additions (3)  
Depreciation expense (131) (113)
Fair value adjustments 0 0
Net foreign currency exchange differences (24) (24)
Ending balance (719) (567)
Accumulated fair value adjustments    
Reconciliation of changes in property, plant and equipment [abstract]    
Beginning balance 1,368 973
Change in accounting policies(1)   0
Additions, net of disposals 0 0
Non-cash additions 0  
Depreciation expense 0 0
Fair value adjustments 215 347
Net foreign currency exchange differences 50 48
Ending balance $ 1,633 $ 1,368