INCOME TAXES (Components of deferred tax assets and liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Foreign tax credits	$ 1,716	$ 1,814
Accrued expenses	1,108	1,069
Net operating losses	2,249	2,235
Employee benefit plans	198	204
Other	267	270
Deferred tax assets	5,538	5,592
Valuation allowances	(4,576)	(4,507)
Net deferred tax assets	962	1,085
Deferred tax liabilities:
Property, plant, equipment and mine development costs	(4,372)	(4,405)
Undistributed earnings	(639)	(601)
Other	(157)	(107)
Total deferred tax liabilities	(5,168)	(5,113)
Net deferred tax liabilities	$ (4,206)	$ (4,028)