PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Change in Projected Benefit Obligations, Plan Assets and Funded Status of All Significant Plans) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Prior Period Reclassification Adjustment				$ 500
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Net Gains (Losses)		$ (585)
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)		(24)
Defined Benefit Plan, Change in Benefit Obligations [Roll Forward]
Benefit Obligations, Beginning Balance		27,979		25,027
Service cost		484		411		$ 471
Interest cost		975		1,096		1,012
Plan participants' contributions		19		21
Plan amendments (1)		30		(500)	[1]
Actuarial changes in assumptions and experience		(929)		4,096
Acquisition/divestiture/other activity		(894)	[2]	(1)
Benefits paid		(1,289)		(1,316)
Currency impact		(723)		(779)
Termination benefits/curtailment cost/settlements		0		(76)	[3]
Benefit Obligations, Ending Balance		25,652		27,979		25,027
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets, beginning balance		19,629		18,827
Actual return on plan assets		314		1,961
Currency impact		(488)		(593)
Employer contributions		844		815
Plan participants' contributions		19		21
Acquisition/divestiture/other activity		(255)	[4]	(86)
Benefits paid		(1,289)		(1,316)
Fair value of plan assets at end of year		18,774		19,629
Less: fair value of assets due Olin		(179)		0
Fair value of plan assets, ending balance		18,595		19,629		18,827
Funded status at end of year		(7,057)		(8,350)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent assets		317		263
Current liabilities		(64)		(68)
Noncurrent liabilities		(7,310)		(8,545)
Net amounts recognized in the consolidated balance sheets		(7,057)		(8,350)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net loss (gain)		10,012		10,845	[5]
Prior service credit		(328)		(419)	[5]
Pretax balance in AOCL at end of year		9,684		10,426
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amortization of Net Gains (Losses)		7
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)		(3)
Defined Benefit Plan, Change in Benefit Obligations [Roll Forward]
Benefit Obligations, Beginning Balance		1,707		1,742
Service cost		14		14		19
Interest cost		59		72		78
Plan participants' contributions		0		0
Plan amendments (1)		0		0
Actuarial changes in assumptions and experience		11		63
Acquisition/divestiture/other activity		0		0
Benefits paid		(172)		(169)
Currency impact		(22)		(15)
Termination benefits/curtailment cost/settlements		0		0
Benefit Obligations, Ending Balance		1,597		1,707		1,742
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
Currency impact		0		0
Employer contributions		0		0
Plan participants' contributions		0		0
Acquisition/divestiture/other activity		0		0
Benefits paid		0		0
Fair value of plan assets at end of year		0		0
Less: fair value of assets due Olin		0		0
Fair value of plan assets, ending balance		0		0		$ 0
Funded status at end of year		(1,597)		(1,707)
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Noncurrent assets		0		0
Current liabilities		(146)		(147)
Noncurrent liabilities		(1,451)		(1,560)
Net amounts recognized in the consolidated balance sheets		(1,597)		(1,707)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net loss (gain)		(154)		(176)
Prior service credit		(3)		(5)
Pretax balance in AOCL at end of year		(157)		$ (181)
Olin [Member] | Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Divestitures, Benefit Obligation	[2]	618
Defined Benefit Plan, Change in Benefit Obligations [Roll Forward]
Acquisition/divestiture/other activity		618
ANGUS Chemical Company [Member] | Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Divestitures, Benefit Obligation	[2]	34
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Acquisition/divestiture/other activity		9
Insurance Company[Member] [Domain] | Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Settlements, Benefit Obligation	[2]	248
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Settlements, Plan Assets		$ 247

[1] The 2014 plan amendments include a change in post-termination interest rates in the U.S. and new legislation in The Netherlands.

[2] The 2015 impact includes the transfer of benefit obligations associated with the Reverse Morris Trust transaction with Olin of $618 million and the transfer of benefit obligations associated with the divestiture of ANGUS to Golden Gate Capital of $34 million. See Notes 5 and 6 as well as the following paragraph for further information. The 2015 impact also includes the transfer of benefit obligations of $248 million in the U.S. through the purchase of annuity contracts from an insurance company.

[3] The 2014 impact relates to settlements associated with the wind-up of a pension plan in The Netherlands and a pension plan in Canada.

[4] The 2015 impact includes the transfer of plan assets associated with the divestiture of ANGUS to Golden Gate Capital of $9 million. The 2015 impact also includes the purchase of annuity contracts of $247 million associated with the transfer of benefit obligations to an insurance company.

[5] The 2014 amounts were adjusted for the Defined Benefit Pension Plans to reclassify $500 million between the "Net loss (gain)" and "Prior service credit" lines.