INCOME TAXES (Deferred Tax Balances) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Property, Plant and Equipment		$ 494	$ 406
Deferred Tax Liabilities, Property, Plant and Equipment		3,177	2,519
Deferred Tax Assets, Loss and Credit Carryforwards		1,920	2,079
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits		2,432	2,115
Deferred Tax Liabilities, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits		210	143
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other		1,678	1,220
Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals, Other		43	151
Deferred Tax Assets, Goodwill and Intangible Assets		120	157
Deferred Tax Liabilities, Goodwill and Intangible Assets		688	954
Deferred Tax Assets, Inventory		28	53
Deferred Tax Liabilities, Inventory		234	239
Deferred Tax Assets, Investments		125	190
Deferred Tax Liabilities, Investments		48	84
Deferred Tax Assets, Other		851	620
Deferred Tax Liabilities, Other		120	247
Deferred Tax Assets, Gross		7,648	6,840
Deferred Tax Liabilities, Gross		4,520	4,337
Deferred Tax Assets, Valuation Allowance		(1,262)	(1,225)
Deferred Tax Assets, Net of Valuation Allowance		$ 6,386	$ 5,615
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 267