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FINANCIAL RISK MANAGEMENT (Assumed financial exposure to credit risk) (Details) - Credit risk
$ in Millions
Dec. 31, 2018
USD ($)
Disclosure of credit risk exposure [line items]  
Trade and other receivables $ 1,828
United States of America, Dollars  
Disclosure of credit risk exposure [line items]  
Trade and other receivables 1,059
Euro Member Countries, Euro  
Disclosure of credit risk exposure [line items]  
Trade and other receivables 60
Argentina, Pesos  
Disclosure of credit risk exposure [line items]  
Trade and other receivables 8
Mexico, Pesos  
Disclosure of credit risk exposure [line items]  
Trade and other receivables 171
Brazil, Brazil Real  
Disclosure of credit risk exposure [line items]  
Trade and other receivables 444
Colombia, Pesos  
Disclosure of credit risk exposure [line items]  
Trade and other receivables 83
Other currencies  
Disclosure of credit risk exposure [line items]  
Trade and other receivables $ 1