INCOME TAXES (Components of deferred tax assets and liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Foreign tax credits	$ 1,814	$ 2,129
Accrued expenses	881	789
Oil and gas properties	0	236
Net operating losses	2,235	2,043
Employee benefit plans	245	248
Other	212	260
Deferred tax assets	5,387	5,705
Valuation allowances	(4,507)	(4,575)
Net deferred tax assets	880	1,130
Deferred tax liabilities:
Property, plant, equipment and mine development costs	(4,200)	(3,754)
Undistributed earnings	(578)	(811)
Other	(130)	(223)
Total deferred tax liabilities	(4,908)	(4,788)
Net deferred tax liabilities	$ (4,028)	$ (3,658)