POSTRETIREMENT BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Schedule of Effect on Operations of Pension Plans and Principal Retiree Benefit Plans

EFFECT ON OPERATIONS OF PENSION PLANS
	Principal pension plans
	Three months ended March 31
(In millions)	2018			2017
Service cost for benefits earned	$	232		$	289
Prior service cost amortization	36			73
Expected return on plan assets	(820		)	(849		)
Interest cost on benefit obligations	666			717
Net actuarial loss amortization	951			710
Curtailment loss	—			43			(a)
Pension plans cost	$	1,065		$	983

(a) Curtailment loss resulting from our intent to sell the Industrial Solutions business within our Power segment.

	Other pension plans
	Three months ended March 31
(In millions)	2018			2017
Service cost for benefits earned	$	95		$	151
Prior service credit amortization	—			(1		)
Expected return on plan assets	(358		)	(294		)
Interest cost on benefit obligations	156			142
Net actuarial loss amortization	82			103
Pension plans cost (income)	$	(25	)	$	101

EFFECT ON OPERATIONS OF PRINCIPAL RETIREE BENEFIT PLANS
	Principal retiree benefit plans
	Three months ended March 31
(In millions)	2018			2017
Service cost for benefits earned	$	13		$	26
Prior service credit amortization	(56		)	(43		)
Expected return on plan assets	(7		)	(9		)
Interest cost on benefit obligations	49			57
Net actuarial gain amortization	(20		)	(21		)
Curtailment loss	—			3			(a)
Retiree benefit plans cost (income)	$	(21	)	$	13

(a) Curtailment loss resulting from our intent to sell the Industrial Solutions business within our Power segment.