RECENT ACCOUNTING DEVELOPMENTS Schedule of New Accounting Pronouncements and Changes in Accounting Principles (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Item Effected [Line Items]
Cost of products sold	$ 3,922	$ 3,749	$ 7,870	$ 7,387
Selling and administrative expenses	$ 451	393	$ 872	786
Previous Accounting Guidance [Member]
Item Effected [Line Items]
Cost of products sold		3,789		7,458	$ 15,300	$ 14,057	$ 14,313
Selling and administrative expenses		399		799	1,653	1,484	1,539
Non-operating pension expense		0		0	0	0	0
Adjustments for New Accounting Pronouncement [Member]
Item Effected [Line Items]
Cost of products sold		(40)		(71)	(499)	(638)	(268)
Selling and administrative expenses		(6)		(13)	(32)	(26)	(43)
Non-operating pension expense		46		84	531	664	311
Accounting Standards Update 2017-07 [Member]
Item Effected [Line Items]
Cost of products sold		3,749		7,387	14,801	13,419	14,045
Selling and administrative expenses		393		786	1,621	1,458	1,496
Non-operating pension expense		$ 46		$ 84	$ 531	$ 664	$ 311