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FINANCIAL RISK MANAGEMENT (Assumed financial exposure to credit risk) (Details) - Credit risk
$ in Millions
Dec. 31, 2020
USD ($)
Disclosure of credit risk exposure [line items]  
Trade and other receivables $ 1,450
United States of America, Dollars  
Disclosure of credit risk exposure [line items]  
Trade and other receivables 798
Euro Member Countries, Euro  
Disclosure of credit risk exposure [line items]  
Trade and other receivables 14
Argentina, Pesos  
Disclosure of credit risk exposure [line items]  
Trade and other receivables 12
Mexico, Pesos  
Disclosure of credit risk exposure [line items]  
Trade and other receivables 160
Brazil, Brazil Real  
Disclosure of credit risk exposure [line items]  
Trade and other receivables 397
Colombia, Pesos  
Disclosure of credit risk exposure [line items]  
Trade and other receivables 68
Other currencies  
Disclosure of credit risk exposure [line items]  
Trade and other receivables $ 1