INCOME TAXES (Deferred Tax Balances) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Property, Plant and Equipment	$ 508	$ 307
Deferred Tax Liabilities, Property, Plant and Equipment	2,474	2,860
Deferred Tax Assets, Loss and Credit Carryforwards	1,734	2,450
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	2,442	3,715
Deferred Tax Liabilities, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	136	75
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	1,251	1,964
Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals	146	883
Deferred Tax Assets, Goodwill and Intangible Assets	176	128
Deferred Tax Liabilities, Goodwill and Intangible Assets	1,010	1,536
Deferred Tax Assets, Inventory	35	50
Deferred Tax Liabilities, Inventory	171	197
Deferred Tax Assets, Investments	272	179
Deferred Tax Liabilities, Investments	158	119
Deferred Tax Assets, Other	420	737
Deferred Tax Liabilities, Other	414	643
Deferred Tax Assets, Gross	6,838	9,530
Deferred Tax Liabilities, Gross	4,509	6,313
Deferred Tax Assets, Valuation Allowance	1,371	1,061
Deferred Tax Assets, Net of Valuation Allowance	5,467	$ 8,469
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 267