PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Change in Projected Benefit Obligations, Plan Assets and Funded Status of All Significant Plans) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Deferred charges and other assets	$ 23,400	$ 23,400	$ 21,200
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)	25	25
Defined Benefit Plan, Change in Benefit Obligations [Roll Forward]
Benefit Obligations, Beginning Balance		30,280	25,652
Service cost		506	463	$ 484
Interest cost		883	846	975
Plan participants' contributions		14	19
Actuarial changes in assumptions and experience		1,804	1,967
Benefits paid		(1,440)	(1,324)
Plan amendments		14	0
Acquisition/divestiture/other		50	3,201
Effect of foreign exchange rates		932	(506)
Termination Benefits/curtailment cost/settlements		(1,192)	(38)
Benefit Obligations, Ending Balance	31,851	31,851	30,280	25,652
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance		21,208	18,774
Actual return on plan assets		2,500	1,437
Employer contributions		1,676	629
Plan participants' contributions		14	19
Benefits paid		1,440	1,324
Acquisition/divestitures/other		(15)	2,077
Effect of foreign exchange rates		646	(404)
Settlements		(1,188)	0
Fair value of plan assets, ending balance	23,401	23,401	21,208	18,774
Funded status at end of year	(8,450)	(8,450)	(9,072)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Deferred charges and other assets	548	548	292
Accrued and other current liabilities	(48)	(48)	(74)
Pension and other postretirement benefits - noncurrent	(8,950)	(8,950)	(9,290)
Net amounts recognized in the consolidated balance sheets	(8,450)	(8,450)	(9,072)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net loss (gain)	10,899	10,899	11,379
Prior service credit	(265)	(265)	(304)
Pretax balance in AOCL at end of year	10,634	10,634	11,075
Other Postretirement Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligations [Roll Forward]
Benefit Obligations, Beginning Balance		1,835	1,597
Service cost		14	13	14
Interest cost		54	52	59
Plan participants' contributions		0	0
Actuarial changes in assumptions and experience		(198)	13
Benefits paid		(151)	(154)
Plan amendments		0	0
Acquisition/divestiture/other		0	313
Effect of foreign exchange rates		13	1
Termination Benefits/curtailment cost/settlements		0	0
Benefit Obligations, Ending Balance	1,567	1,567	1,835	1,597
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance		0	0
Actual return on plan assets		0	0
Employer contributions		0	0
Plan participants' contributions		0	0
Benefits paid		0	0
Acquisition/divestitures/other		0	0
Effect of foreign exchange rates		0	0
Settlements		0	0
Fair value of plan assets, ending balance	0	0	0	$ 0
Funded status at end of year	(1,567)	(1,567)	(1,835)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Deferred charges and other assets	0	0	0
Accrued and other current liabilities	(125)	(125)	(158)
Pension and other postretirement benefits - noncurrent	(1,442)	(1,442)	(1,677)
Net amounts recognized in the consolidated balance sheets	(1,567)	(1,567)	(1,835)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net loss (gain)	(326)	(326)	(133)
Prior service credit	0	0	0
Pretax balance in AOCL at end of year	(326)	(326)	(133)
Pension Plan, Excluding Plans with Plan Assets [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status at end of year	(754)	(754)	(1,476)
Other Postretirement Benefit Plans, Excluding Plans with Plan Assets [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status at end of year	(1,567)	(1,567)	(1,835)
Insurance Company[Member] [Domain] | Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement			53
Defined Benefit Plan, Plan Assets, Payment for Settlement			55
Olin [Member] | Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Defined Benefit Plan, Plan Assets, Divestiture			184
Dow Corning Corporation [Member] | Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Projected benefit obligations			3,252
Defined Benefit Plan, Plan Assets, Business Combination			2,327
Dow Corning Corporation [Member] | Other Postretirement Benefits [Member]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Projected benefit obligations			313
UNITED STATES | Pension Plans With Plan Assets [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status at end of year	(5,363)	(5,363)	(5,122)
UNITED STATES | Other Postretirement Benefit Plans With Plan Assets [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status at end of year	0	0	0
UNITED STATES | Dow Corning Corporation [Member] | Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment			36
Foreign Plan [Member] | Pension Plans With Plan Assets [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status at end of year	(2,333)	(2,333)	(2,474)
Foreign Plan [Member] | Other Postretirement Benefit Plans With Plan Assets [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Funded status at end of year	0	0	$ 0
CHINA | Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Pension and other postretirement benefits - noncurrent	(69)	(69)
KOREA, REPUBLIC OF | Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Defined Benefit Plan, Benefit Obligation, Divestiture		25
Defined Benefit Plan, Benefit Obligation, Plan Conversion, Payment For Settlement		22
Defined Benefit Plan, Plan Assets, Plan Conversion, Payment For Settlement		$ 18
Nonqualified Plan [Member] | UNITED STATES | Defined Benefit Pension Plans [Member]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Defined Benefit Plan, Benefit Obligation, Change In Control, Payment For Settlement	$ 1,170