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CASH AND CASH EQUIVALENTS (Tables)
 12 Months Ended
Dec. 31, 2020
Cash and cash equivalents [abstract]  
Cash and Cash Equivalents by Type
US Dollars
Figures in millions202020192018
Cash and deposits on call1,081 417 312 
Money market instruments249 39 17 
Total cash and cash equivalents (notes 35 and note 36)
1,330 456 329