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 Plans
	Defined Benefit Pension Plans									Other Postretirement Benefits
In millions	2016			2015			2014			2016			2015			2014
Service cost	$	39		$	44		$	30		$	1		$	1		$	1
Interest cost	131			164			183			8			10			13
Expected return on plan assets	(217		)	(226		)	(232		)	—			—			—
Amortization of prior service cost (credit)	(1		)	(1		)	6			—			(1		)	—
Amortization of net (gain) loss	75			87			66			(7		)	(10		)	(10		)
Net periodic benefit cost	$	27		$	68		$	53		$	2		$	—		$	4

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 Plans
	Defined Benefit Pension Plans									Other Postretirement Benefits
In millions	2016			2015			2014			2016		2015		2014
Net (gain) loss	$	208		$	34		$	450		$	4	$	19	$	(12	)
Prior service cost (credit) arising during period	—			4			(38		)	—		—		—
Amortization of prior service (cost) credit	1			1			(6		)	—		1		—
Amortization of net gain (loss)	(75		)	(87		)	(66		)	7		10		10
Total recognized in other comprehensive (income) loss	$	134		$	(48	)	$	340		$	11	$	30	$	(2	)
Total recognized in net periodic benefit cost and other comprehensive loss	$	161		$	20		$	393		$	13	$	30	$	2

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 for all Plans
In millions	Defined Benefit Pension Plans						Other Postretirement Benefits
Change in projected benefit obligation:	2016			2015			2016			2015
Benefit obligation at beginning of year	$	3,993		$	4,345		$	276		$	270
Service cost	39			44			1			1
Interest cost	131			164			8			10
Plan amendments	—			4			—			—
Actuarial changes in assumptions and experience	155			(178		)	4			19
Benefits paid	(285		)	(293		)	(25		)	(24		)
Other (1)	(8		)	(93		)	—			—
Benefit obligation at end of year	$	4,025		$	3,993		$	264		$	276

Change in plan assets:
Fair value of plan assets at beginning of year	$	3,173		$	3,543		$	—		$	—
Actual return on plan assets	165			14			—			—
Employer contributions	52			2			—			—
Asset transfers (1)	(8		)	(93		)	—			—
Benefits paid	(285		)	(293		)	—			—
Fair value of plan assets at end of year	$	3,097		$	3,173		$	—		$	—

Funded status at end of year	$	(928	)	$	(820	)	$	(264	)	$	(276	)



Net amounts recognized in the consolidated balance sheets at December 31:
Current liabilities	$	(2	)	$	(2	)	$	(24	)	$	(26	)
Noncurrent liabilities	(926		)	(818		)	(240		)	(250		)
Net amounts recognized in the consolidated balance sheets	$	(928	)	$	(820	)	$	(264	)	$	(276	)

Pretax amounts recognized in AOCL at December 31:
Net loss (gain)	$	2,035		$	1,902		$	(69	)	$	(80	)
Prior service credit	(13		)	(14		)	—			—
Pretax balance in AOCL at end of year	$	2,022		$	1,888		$	(69	)	$	(80	)


(1)	The 2015 impact includes the transfer of benefit obligations of $71 million through the purchase of annuity contracts from 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	$	275	$	25
2018	274		22
2019	273		22
2020	273		21
2021	272		21
2022 through 2026	1,314		88
Total	$	2,681	$	199

Schedule of Allocation of Plan Assets [Table Text Block]



Strategic Target Allocation of Plan Assets
Asset Category	Target Allocation
Equity securities	23	%
Fixed income securities	45	%
Alternative investments	27	%
Other	5	%
Total	100	%

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The following tables summarize the bases used to measure the Corporation's pension plan assets at fair value for the years ended December 31, 2016 and 2015:



Basis of Fair Value Measurements at December 31, 2016 In millions	Quoted Prices in Active Markets for Identical Items (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Total
Cash and cash equivalents	$	—	$	242		$	—	$	242
Equity securities:
U.S. equity	$	235	$	17		$	—	$	252
Non-U.S. equity - developed countries	67		98			—		165
Emerging markets	43		80			6		129
Convertible bonds	1		—			—		1
Equity derivatives	—		(3		)	—		(3		)
Total equity securities	$	346	$	192		$	6	$	544
Fixed income securities:
U.S. government and municipalities	$	—	$	838		$	—	$	838
U.S. agency mortgage backed securities	—		50			—		50
Corporates - investment grade	—		423			—		423
Non-U.S. governments - developed countries	—		4			—		4
Non-U.S. corporates - developed countries	—		81			—		81
Emerging markets debt	—		7			—		7
Other asset-backed securities	—		33			—		33
Other fixed income funds	—		—			77		77
Fixed income derivatives	—		(16		)	—		(16		)
High yield bonds	—		1			—		1
Total fixed income securities	$	—	$	1,421		$	77	$	1,498
Alternative investments:
Real estate	$	—	$	—		$	329	$	329
Private equity	—		—			214		214
Absolute return	—		160			104		264
Total alternative investments	$	—	$	160		$	647	$	807
Total other securities	$	—	$	(13	)	$	19	$	6
Total pension plan assets at fair value	$	346	$	2,002		$	749	$	3,097



Basis of Fair Value Measurements at December 31, 2015 In millions	Quoted Prices in Active Markets for Identical Items (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Cash and cash equivalents	$	1	$	173	$	—	$	174
Equity securities:
U.S. equity	$	237	$	35	$	—	$	272
Non-U.S. equity - developed countries	71		136		—		207
Emerging markets	45		90		5		140
Equity derivatives	—		3		—		3
Total equity securities	$	353	$	264	$	5	$	622
Fixed income securities:
U.S. government and municipalities	$	—	$	574	$	—	$	574
U.S. agency mortgage backed securities	—		56		—		56
Corporates - investment grade	—		677		—		677
Non-U.S. governments - developed countries	—		5		—		5
Non-U.S. corporates - developed countries	—		146		—		146
Emerging markets debt	—		12		—		12
Other asset-backed securities	—		13		—		13
Other fixed income funds	—		—		51		51
Fixed income derivatives	—		15		—		15
High yield bonds	—		3		—		3
Total fixed income securities	$	—	$	1,501	$	51	$	1,552
Alternative investments:
Real estate	$	—	$	—	$	284	$	284
Private equity	—		—		220		220
Absolute return	—		114		165		279
Total alternative investments	$	—	$	114	$	669	$	783
Total other securities	$	—	$	20	$	22	$	42
Total pension plan assets at fair value	$	354	$	2,072	$	747	$	3,173

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 are provided below:



Pension Plan Assumptions	Benefit Obligations at December 31						Net Periodic Costs for the Year
	2016		2015		2014		2016		2015		2014
Discount rate	4.00	%	4.26	%	3.90	%	4.26	%	3.90	%	4.75	%
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	—		—		—		6.80	%	6.80	%	6.80	%

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 obligation	$	4,025	$	3,993
Accumulated benefit obligation	$	3,997	$	3,960
Fair value of plan assets	$	3,097	$	3,173

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, 2016 and 2015:



Fair Value Measurement of Level 3	Equity Securities			Fixed Income Securities			Alternative Investments			Other Securities			Total
Pension Plan Assets
In millions
Balance at January 1, 2015	$	4		$	33		$	687		$	22		$	746
Actual return on plan assets:
Relating to assets held at Dec 31, 2015	2			(4		)	(35		)	—			(37		)
Relating to assets sold during 2015	—			1			60			—			61
Purchases, sales and settlements	—			21			(42		)	—			(21		)
Transfers out of Level 3, net	(1		)	—			—			—			(1		)
Foreign currency impact	—			—			(1		)	—			(1		)
Balance at December 31, 2015	$	5		$	51		$	669		$	22		$	747
Actual return on plan assets:
Relating to assets held at Dec 31, 2016	1			(6		)	(30		)	2			(33		)
Relating to assets sold during 2016	—			—			39			(8		)	31
Purchases, sales and settlements	—			32			(30		)	3			5
Foreign currency impact	—			—			(1		)	—			(1		)
Balance at December 31, 2016	$	6		$	77		$	647		$	19		$	749