ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accounts payable	$ 1,473	$ 1,654
Salaries, wages and other compensation	312	249
Accrued interesta	243	178
PT-FI contingenciesb	196	115
Pension, postretirement, postemployment and other employee benefits	91	69
Legal matters	86	88
Accrued taxes, other than income taxes	76	79
Deferred revenue	65	12
Leases	38	44
Other	128	88
Total accounts payable and accrued liabilities	2,708	2,576
Cash interest paid, net	$ 472	$ 591	$ 500