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ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts Payable and Accrued Liabilities, Current [Abstract]      
Accounts payable $ 1,654 $ 1,661  
Salaries, wages and other compensation 249 273  
Accrued interesta 178 183  
PT-FI contingenciesb 115 162  
Legal matters 88 16  
Accrued taxes, other than income taxes 79 109  
Pension, postretirement, postemployment and other employee benefitsc 69 78  
Leases 44 0  
Other 100 143  
Total accounts payable and accrued liabilities 2,576 2,625  
Cash interest paid, net $ 591 $ 500 $ 565