INCOME TAXES (Deferred Tax Balances) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Property, Plant and Equipment	$ 460	$ 508
Deferred Tax Liabilities, Property, Plant and Equipment	2,550	2,474
Deferred Tax Assets, Loss and Credit Carryforwards	2,244	1,734
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	2,226	2,442
Deferred Tax Liabilities, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	213	136
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	1,250	1,251
Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals, Other	110	146
Deferred Tax Assets, Goodwill and Intangible Assets	151	176
Deferred Tax Liabilities, Goodwill and Intangible Assets	942	1,010
Deferred Tax Assets, Inventory	68	35
Deferred Tax Liabilities, Inventory	163	171
Deferred Tax Assets, Investments	181	272
Deferred Tax Liabilities, Investments	60	158
Deferred Tax Assets, Other	587	420
Deferred Tax Liabilities, Other	442	414
Deferred Tax Assets, Gross	7,167	6,838
Deferred Tax Liabilities, Gross	4,480	4,509
Deferred Tax Assets, Valuation Allowance	(1,320)	(1,371)
Deferred Tax Assets, Net of Valuation Allowance	5,847	$ 5,467
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 267