PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)

12 Months Ended

Dec. 31, 2015

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

Net Periodic Benefit Cost for All Significant Plans
	Defined Benefit Pension Plans									Other Postretirement Benefits
In millions	2015			2014			2013			2015			2014			2013
Service cost	$	484		$	411		$	471		$	14		$	14		$	19
Interest cost	975			1,096			1,012			59			72			78
Expected return on plan assets	(1,382		)	(1,322		)	(1,248		)	—			—			—
Amortization of prior service cost (credit)	(28		)	22			25			(2		)	(2		)	(4		)
Amortization of unrecognized (gain) loss	706			500			788			(11		)	(14		)	4
Curtailment/settlement/other (1) (2)	—			(2		)	5			—			—			—
Net periodic benefit cost	$	755		$	705		$	1,053		$	60		$	70		$	97

(1) The 2013 impact primarily relates to settlements associated with the wind-up of a Canadian pension plan.

(2) The 2014 impact relates to settlements associated with the wind-up of a pension plan in The Netherlands and a pension plan in Canada.

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive (Income) Loss for All Significant Plans
	Defined Benefit Pension Plans									Other Postretirement Benefits
In millions	2015			2014			2013			2015		2014		2013
Net (gain) loss	$	(127	)	$	3,528		$	(2,343	)	$	11	$	63	$	(404	)
Prior service cost (credit) arising during period	63			(500		)	—			—		—		—
Amortization of prior service (cost) credit	28			(22		)	(25		)	2		2		4
Amortization of unrecognized gain (loss)	(706		)	(498		)	(793		)	11		14		(4		)
Total recognized in other comprehensive (income) loss	$	(742	)	$	2,508		$	(3,161	)	$	24	$	79	$	(404	)
Total recognized in net periodic benefit cost and other comprehensive (income) loss	$	13		$	3,213		$	(2,108	)	$	84	$	149	$	(307	)

Schedule of Change in Projected Benefit Obligations, Plan Assets and Funded Status of All Significant Plans [Table Text Block]

Change in Projected Benefit Obligations, Plan Assets and Funded Status of All Significant Plans
In millions	Defined Benefit Pension Plans						Other Postretirement Benefits
Change in projected benefit obligations:	2015			2014			2015			2014
Benefit obligations at beginning of year	$	27,979		$	25,027		$	1,707		$	1,742
Service cost	484			411			14			14
Interest cost	975			1,096			59			72
Plan participants’ contributions	19			21			—			—
Plan amendments (1)	30			(500		)	—			—
Actuarial changes in assumptions and experience	(929		)	4,096			11			63
Acquisition/divestiture/other activity (2)	(894		)	(1		)	—			—
Benefits paid	(1,289		)	(1,316		)	(172		)	(169		)
Currency impact	(723		)	(779		)	(22		)	(15		)
Termination benefits/curtailment cost/settlements (3)	—			(76		)	—			—
Benefit obligations at end of year	$	25,652		$	27,979		$	1,597		$	1,707
Change in plan assets:
Fair value of plan assets at beginning of year	$	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 (4)	(255		)	(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 to Olin	$	(179	)	$	—		$	—		$	—
Net fair value of plan assets at end of year	$	18,595		$	19,629		$	—		$	—
Funded status at end of year	$	(7,057	)	$	(8,350	)	$	(1,597	)	$	(1,707	)
Net amounts recognized in the consolidated balance sheets at December 31:
Noncurrent assets	$	317		$	263		$	—		$	—
Current liabilities	(64		)	(68		)	(146		)	(147		)
Noncurrent liabilities	(7,310		)	(8,545		)	(1,451		)	(1,560		)
Net amounts recognized in the consolidated balance sheets	$	(7,057	)	$	(8,350	)	$	(1,597	)	$	(1,707	)
Pretax amounts recognized in AOCL at December 31:
Net loss (gain) (5)	$	10,012		$	10,845		$	(154	)	$	(176	)
Prior service credit (5)	(328		)	(419		)	(3		)	(5		)
Pretax balance in AOCL at end of year	$	9,684		$	10,426		$	(157	)	$	(181	)

(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.

Schedule of Expected Benefit Payments [Table Text Block]

Estimated Future Benefit Payments at December 31, 2015
In millions	Defined Benefit Pension Plans		Other Postretirement Benefits
2016	$	1,277	$	149
2017	1,281		144
2018	1,311		139
2019	1,351		135
2020	1,385		130
2021 through 2025	7,361		560
Total	$	13,966	$	1,257

Schedule of Allocation of Plan Assets [Table Text Block]

Strategic Weighted-Average Target Allocation of Plan Assets for All Significant Plans
Asset Category	Target Allocation
Equity securities	35	%
Fixed income securities	34	%
Alternative investments	30	%
Other investments	1	%
Total	100	%

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

Basis of Fair Value Measurements of Pension Plan Assets at December 31, 2015	Quoted Prices in Active Markets for Identical Items			Significant Other Observable Inputs		Significant Unobservable Inputs
In millions	(Level 1)			(Level 2)		(Level 3)		Total
Cash and cash equivalents	$	84		$	733	$	—	$	817
Equity securities:
U.S. equity (1)	$	2,525		$	558	$	1	$	3,084
Non-U.S. equity – developed countries	1,877			1,167		—		3,044
Emerging markets	462			542		27		1,031
Convertible bonds	26			177		—		203
Equity derivatives	—			8		—		8
Total equity securities	$	4,890		$	2,452	$	28	$	7,370
Fixed income securities:
U.S. government and municipalities	$	—		$	1,320	$	—	$	1,320
U.S. agency and agency mortgage-backed securities	—			279		—		279
Corporate bonds – investment grade	—			1,527		—		1,527
Non-U.S. governments – developed countries	—			1,161		—		1,161
Non-U.S. corporate bonds – developed countries	—			917		—		917
Emerging market debt	—			109		—		109
Other asset-backed securities	—			88		1		89
High yield bonds	47			166		16		229
Other fixed income funds	—			295		276		571
Fixed income derivatives	—			33		—		33
Total fixed income securities	$	47		$	5,895	$	293	$	6,235
Alternative investments:
Real estate	$	22		$	38	$	1,772	$	1,832
Private equity	—			—		1,054		1,054
Absolute return	—			483		695		1,178
Total alternative investments	$	22		$	521	$	3,521	$	4,064
Other investments	$	—		$	250	$	38	$	288
Total pension plan assets at fair value	$	5,043		$	9,851	$	3,880	$	18,774
Less: Fair value of pension plan assets due to Olin (2)	(179		)	—		—		(179		)
Net pension plan assets at fair value	$	4,864		$	9,851	$	3,880	$	18,595

(1) Includes no Company common stock.

(2) Pension plan assets due to Olin and expected to be transferred in 2016. See Note 6 for additional information.

Basis of Fair Value Measurements of Pension Plan Assets at December 31, 2014	Quoted Prices in Active Markets for Identical Items		Significant Other Observable Inputs		Significant Unobservable Inputs
In millions	(Level 1)		(Level 2)		(Level 3)		Total
Cash and cash equivalents	$	61	$	953	$	—	$	1,014
Equity securities:
U.S. equity (1)	$	3,011	$	428	$	9	$	3,448
Non-U.S. equity – developed countries	1,814		1,410		—		3,224
Emerging markets	472		538		23		1,033
Convertible bonds	15		195		—		210
Equity derivatives	—		7		—		7
Total equity securities	$	5,312	$	2,578	$	32	$	7,922
Fixed income securities:
U.S. government and municipalities	$	—	$	1,406	$	—	$	1,406
U.S. agency and agency mortgage-backed securities	—		310		—		310
Corporate bonds – investment grade	—		1,605		—		1,605
Non-U.S. governments – developed countries	—		1,212		—		1,212
Non-U.S. corporate bonds – developed countries	—		961		—		961
Emerging market debt	—		93		—		93
Other asset-backed securities	—		105		1		106
High yield bonds	—		168		16		184
Other fixed income funds	—		299		294		593
Fixed income derivatives	—		31		—		31
Total fixed income securities	$	—	$	6,190	$	311	$	6,501
Alternative investments:
Real estate	$	31	$	36	$	1,627	$	1,694
Private equity	—		—		1,059		1,059
Absolute return	—		586		656		1,242
Total alternative investments	$	31	$	622	$	3,342	$	3,995
Other investments	$	—	$	157	$	40	$	197
Total pension plan assets at fair value	$	5,404	$	10,500	$	3,725	$	19,629

(1)    Includes no Company common stock.

Defined Benefit Pension Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Assumptions Used [Table Text Block]

Weighted-Average Assumptions for All Pension Plans	Benefit Obligations at December 31						Net Periodic Costs for the Year
	2015		2014		2013		2015		2014		2013
Discount rate	3.88	%	3.60	%	4.54	%	3.60	%	4.54	%	3.88	%
Rate of increase in future compensation levels	4.13	%	4.13	%	4.15	%	4.13	%	4.15	%	3.96	%
Expected long-term rate of return on plan assets	—		—		—		7.35	%	7.40	%	7.47	%

Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets at December 31
In millions	2015		2014
Projected benefit obligations	$	23,421	$	25,539
Accumulated benefit obligations	$	22,409	$	24,281
Fair value of plan assets	$	16,066	$	16,932

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

Fair Value Measurement of Level 3 Pension Plan Assets	Equity Securities			Fixed Income Securities			Alternative Investments			Other Investments			Total
In millions
Balance at January 1, 2014	$	12		$	237		$	2,761		$	40		$	3,050
Actual return on plan assets:
Relating to assets sold during 2014	—			22			139			—			161
Relating to assets held at Dec 31, 2014	(12		)	(7		)	191			1			173
Purchases, sales and settlements	32			63			300			(1		)	394
Transfers out of Level 3, net	—			(3		)	—			—			(3		)
Foreign currency impact	—			(1		)	(49		)	—			(50		)
Balance at December 31, 2014	$	32		$	311		$	3,342		$	40		$	3,725
Actual return on plan assets:
Relating to assets sold during 2015	—			18			233			—			251
Relating to assets held at Dec 31, 2015	—			(9		)	58			(2		)	47
Purchases, sales and settlements	2			(27		)	(90		)	—			(115		)
Transfers out of Level 3, net	(6		)	(1		)	5			—			(2		)
Foreign currency impact	—			1			(27		)	—			(26		)
Balance at December 31, 2015	$	28		$	293		$	3,521		$	38		$	3,880

Defined Benefit Pension Plans, U.S.

Defined Benefit Plan Disclosure [Line Items]

Schedule of Assumptions Used [Table Text Block]

Weighted-Average Assumptions for U.S. Pension Plans	Benefit Obligations at December 31						Net Periodic Costs for the Year
	2015		2014		2013		2015		2014		2013
Discount rate	4.40	%	4.04	%	4.92	%	4.04	%	4.92	%	4.02	%
Rate of increase in future compensation levels	4.50	%	4.50	%	4.50	%	4.50	%	4.50	%	4.50	%
Expected long-term rate of return on plan assets	—		—		—		7.85	%	7.82	%	7.85	%

United States Postretirement Benefit Plan of US Entity [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Assumptions Used [Table Text Block]

U.S. Plan Assumptions for Other Postretirement Benefits	Benefit Obligations at December 31						Net Periodic Costs for the Year
	2015		2014		2013		2015		2014		2013
Discount rate	3.97	%	3.68	%	4.37	%	3.68	%	4.37	%	3.67	%
Initial health care cost trend rate	7.25	%	7.06	%	7.45	%	7.06	%	7.45	%	7.84	%
Ultimate health care cost trend rate	5.00	%	5.00	%	5.00	%	5.00	%	5.00	%	5.00	%
Year ultimate trend rate to be reached	2025		2020		2020		2025		2020		2020