POSTRETIREMENT BENEFIT PLANS (Tables)

6 Months Ended

Jun. 30, 2017

Compensation and Retirement Disclosure [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 June 30						Six months ended June 30
(In millions)	2017			2016			2017				2016
Service cost for benefits earned	$	254		$	291		$	543			$	606
Prior service cost amortization	72			76			145				152
Expected return on plan assets	(849		)	(836		)	(1,698		)		(1,670		)
Interest cost on benefit obligations	712			735			1,429				1,469
Net actuarial loss amortization	697			612			1,407				1,224
Curtailment loss (gain)	—			(1		)	43			(a)	(1		)
Pension plans cost	$	886		$	877		$	1,869			$	1,780

(a) Curtailment loss resulting from our intent to sell the Industrial Solutions business within our Energy Connections & Lighting segment.

	Other pension plans
	Three months ended June 30						Six months ended June 30
(In millions)	2017			2016			2017			2016
Service cost for benefits earned	$	123		$	118		$	274		$	231
Prior service credit amortization	(1		)	—			(2		)	(1		)
Expected return on plan assets	(301		)	(259		)	(595		)	(522		)
Interest cost on benefit obligations	145			168			287			340
Net actuarial loss amortization	107			65			210			129
Pension plans cost	$	73		$	92		$	174		$	177

EFFECT ON OPERATIONS OF PRINCIPAL RETIREE BENEFIT PLANS
	Principal retiree benefit plans
	Three months ended June 30						Six months ended June 30
(In millions)	2017			2016			2017				2016
Service cost for benefits earned	$	26		$	27		$	52			$	52
Prior service credit amortization	(43		)	(41		)	(86		)		(82		)
Expected return on plan assets	(9		)	(11		)	(18		)		(22		)
Interest cost on benefit obligations	56			63			113				126
Net actuarial gain amortization	(20		)	(14		)	(41		)		(27		)
Curtailment loss	—			—			3			(a)	—
Retiree benefit plans cost	$	10		$	24		$	23			$	47

(a) Curtailment loss resulting from our intent to sell the Industrial Solutions business within our Energy Connections & Lighting segment.