PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Tables)

12 Months Ended

Dec. 31, 2016

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	2016 (1)			2015			2014			2016 (1)			2015			2014
Service cost	$	463		$	484		$	411		$	13		$	14		$	14
Interest cost	846			975			1,096			52			59			72
Expected return on plan assets	(1,447		)	(1,382		)	(1,322		)	—			—			—
Amortization of prior service cost (credit)	(24		)	(28		)	22			(3		)	(2		)	(2		)
Amortization of unrecognized (gain) loss	587			706			500			(7		)	(11		)	(14		)
Curtailment/settlement/other (2)	(36		)	—			(2		)	—			—			—
Net periodic benefit cost	$	389		$	755		$	705		$	55		$	60		$	70

(1) Includes net periodic benefit costs of $26 million for defined benefit pension plans and $8 million of other postretirement benefits for plans assumed from Dow Corning.

(2) The 2016 impact relates to the curtailment of benefits for certain participants of a Dow Corning plan in the U.S. 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	2016			2015			2014			2016		2015		2014
Net (gain) loss	$	1,954		$	(127	)	$	3,528		$	14	$	11	$	63
Prior service cost (credit) arising during period	—			63			(500		)	—		—		—
Amortization of prior service (cost) credit	24			28			(22		)	3		2		2
Amortization of unrecognized gain (loss)	(587		)	(706		)	(498		)	7		11		14
Total recognized in other comprehensive (income) loss	$	1,391		$	(742	)	$	2,508		$	24	$	24	$	79
Total recognized in net periodic benefit cost and other comprehensive loss	$	1,780		$	13		$	3,213		$	79	$	84	$	149

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:	2016			2015			2016			2015
Benefit obligations at beginning of year	$	25,652		$	27,979		$	1,597		$	1,707
Service cost	463			484			13			14
Interest cost	846			975			52			59
Plan participants’ contributions	19			19			—			—
Plan amendments	—			30			—			—
Actuarial changes in assumptions and experience	1,967			(929		)	13			11
Acquisition/divestiture/other activity (1)	3,201			(894		)	313			—
Benefits paid	(1,324		)	(1,289		)	(154		)	(172		)
Currency impact	(506		)	(723		)	1			(22		)
Termination benefits/curtailment cost/settlements (2)	(38		)	—			—			—
Benefit obligations at end of year	$	30,280		$	25,652		$	1,835		$	1,597
Change in plan assets:
Fair value of plan assets at beginning of year	$	18,774		$	19,629		$	—		$	—
Actual return on plan assets	1,437			314			—			—
Currency impact	(404		)	(488		)	—			—
Employer contributions	629			844			—			—
Plan participants’ contributions	19			19			—			—
Acquisition/divestiture/other activity (3)	2,077			(255		)	—			—
Benefits paid	(1,324		)	(1,289		)	—			—
Fair value of plan assets at end of year	$	21,208		$	18,774		$	—		$	—
Less: Fair value of assets due to Olin	$	—		$	(179	)	$	—		$	—
Net fair value of plan assets at end of year	$	21,208		$	18,595		$	—		$	—
Funded status at end of year	$	(9,072	)	$	(7,057	)	$	(1,835	)	$	(1,597	)
Net amounts recognized in the consolidated balance sheets at December 31:
Noncurrent assets	$	292		$	317		$	—		$	—
Current liabilities	(74		)	(64		)	(158		)	(146		)
Noncurrent liabilities	(9,290		)	(7,310		)	(1,677		)	(1,451		)
Net amounts recognized in the consolidated balance sheets	$	(9,072	)	$	(7,057	)	$	(1,835	)	$	(1,597	)
Pretax amounts recognized in AOCL at December 31:
Net loss (gain)	$	11,379		$	10,012		$	(133	)	$	(154	)
Prior service credit	(304		)	(328		)	—			(3		)
Pretax balance in AOCL at end of year	$	11,075		$	9,684		$	(133	)	$	(157	)

(1) The 2016 impact includes pension benefit obligations of $3,252 million and other postretirement benefit obligations of $313 million assumed with the ownership restructure of Dow Corning. The 2016 impact also includes the transfer of benefit obligations of $53 million in the U.S. through the purchase of annuity contracts from an insurance company. 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. 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. See Notes 4, 5 and 6 for additional information.

(2) The 2016 impact primarily relates to the curtailment of benefits for certain participants of a U.S. Dow Corning plan of $36 million.

(3) The 2016 impact includes plan assets assumed with the ownership restructure of Dow Corning of $2,327 million. The 2016 impact also includes the purchase of annuity contracts of $55 million in the U.S. associated with the transfer of benefit obligations to an insurance company and the transfer of plan assets associated with the Reverse Morris Trust transaction with Olin of $184 million. 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 in the U.S. associated with the transfer of benefit obligations to an insurance company.

Schedule of Expected Benefit Payments [Table Text Block]

The estimated future benefit payments, reflecting expected future service, as appropriate, are presented in the following table:

Estimated Future Benefit Payments at December 31, 2016
In millions	Defined Benefit Pension Plans		Other Postretirement Benefits
2017	$	1,433	$	161
2018	1,460		155
2019	1,501		151
2020	1,536		146
2021	1,571		142
2022 through 2026	8,374		627
Total	$	15,875	$	1,382

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, 2016	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	$	73	$	806		$	—	$	879
Equity securities:
U.S. equity (1)	$	2,642	$	983		$	1	$	3,626
Non-U.S. equity – developed countries	1,955		1,232			1		3,188
Emerging markets	508		557			31		1,096
Convertible bonds	21		199			1		221
Total equity securities	$	5,126	$	2,971		$	34	$	8,131
Fixed income securities:
U.S. government and municipalities	$	—	$	2,091		$	—	$	2,091
U.S. agency and agency mortgage-backed securities	—		309			—		309
Corporate bonds – investment grade	—		1,562			—		1,562
Non-U.S. governments – developed countries	—		1,135			—		1,135
Non-U.S. corporate bonds – developed countries	—		1,176			—		1,176
Emerging market debt	—		131			—		131
Other asset-backed securities	—		95			2		97
High yield bonds	—		190			13		203
Other fixed income funds	—		351			483		834
Fixed income derivatives	—		(17		)	—		(17		)
Total fixed income securities	$	—	$	7,023		$	498	$	7,521
Alternative investments:
Real estate	$	21	$	24		$	2,042	$	2,087
Private equity	—		—			1,128		1,128
Absolute return	—		723			465		1,188
Total alternative investments	$	21	$	747		$	3,635	$	4,403
Other investments	$	—	$	179		$	95	$	274
Total pension plan assets at fair value	$	5,220	$	11,726		$	4,262	$	21,208

(1) Includes no Company common stock.

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 were transferred to Olin in 2016. The final plan assets transferred totaled $184 million, which reflected return on plan assets and benefits paid to participants from the closing date of the Transaction with Olin to the date of transfer. See Note 6 for additional information.

Defined Benefit Pension Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Assumptions Used [Table Text Block]

The weighted-average assumptions used to determine pension plan obligations and net periodic benefit costs for the plans are provided in the two tables below:

Weighted-Average Assumptions for All Pension Plans	Benefit Obligations at December 31						Net Periodic Costs for the Year
	2016		2015		2014		2016		2015		2014
Discount rate	3.52	%	3.88	%	3.60	%	3.85	%	3.60	%	4.54	%
Rate of increase in future compensation levels	3.90	%	4.13	%	4.13	%	4.04	%	4.13	%	4.15	%
Expected long-term rate of return on plan assets	—		—		—		7.22	%	7.35	%	7.40	%

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	2016		2015
Projected benefit obligations	$	27,877	$	23,421
Accumulated benefit obligations	$	26,590	$	22,409
Fair value of plan assets	$	18,523	$	16,066

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

The following table summarizes the changes in fair value of Level 3 pension plan assets for the years ended December 31, 2015 and 2016:

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, 2015	$	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 in (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
Actual return on plan assets:
Relating to assets sold during 2016	—			2			163			(7		)	158
Relating to assets held at Dec 31, 2016	9			(4		)	10			11			26
Purchases, sales and settlements (1)	1			202			(35		)	53			221
Transfers in (out) of Level 3, net	(2		)	3			—			—			1
Foreign currency impact	(2		)	2			(24		)	—			(24		)
Balance at December 31, 2016	$	34		$	498		$	3,635		$	95		$	4,262

(1) Includes $35 million of alternative investments associated with the ownership restructure of Dow Corning.

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
	2016		2015		2014		2016		2015		2014
Discount rate	4.11	%	4.40	%	4.04	%	4.40	%	4.04	%	4.92	%
Rate of increase in future compensation levels	4.25	%	4.50	%	4.50	%	4.50	%	4.50	%	4.50	%
Expected long-term rate of return on plan assets	—		—		—		7.77	%	7.85	%	7.82	%

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
	2016		2015		2014		2016		2015		2014
Discount rate	3.83	%	3.97	%	3.68	%	3.96	%	3.68	%	4.37	%
Initial health care cost trend rate	7.00	%	7.25	%	7.06	%	7.25	%	7.06	%	7.45	%
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		2025		2020		2025		2020		2020

Dow Corning Corporation [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Change in Projected Benefit Obligations, Plan Assets and Funded Status of Plans from Ownership Restructure of Dow Corning [Table Text Block]

Plan Assets and Obligations for all Significant Plans Assumed from Dow Corning at June 1, 2016	Defined Benefit Pension Plans		Other Postretirement Benefits
In millions
Fair value of plan assets	$	2,327	$	—
Projected benefit obligations	3,252		313
Net liability assumed	$	925	$	313