Net periodic benefit expense included in our Consolidated Statements of Operations, and other amounts recognized in our Consolidated Statements of Stockholders' Deficit, for the periods ended July 31 is comprised of the following:



	Three Months Ended July 31,												Nine Months Ended July 31,
	Pension Benefits						Health and Life Insurance Benefits						Pension Benefits						Health and Life Insurance Benefits
(in millions)	2017			2016			2017			2016			2017			2016			2017			2016
Service cost for benefits earned during the period	$	2		$	2		$	1		$	1		$	6		$	7		$	4		$	4
Interest on obligation	27			29			11			14			80			88			35			44
Amortization of cumulative loss	30			26			6			8			89			78			17			24
Amortization of prior service benefit	—			—			—			—			—			—			—			(1		)
Settlements	23			—			—			—			23			—			—			—
Contractual termination benefits	9			1			4			4			10			3			4			4
Curtailments and other	—			—			(58		)	—			—			—			(58		)	—
Premiums on pension insurance	4			4			—			—			12			12			—			—
Expected return on assets	(40		)	(41		)	(5		)	(6		)	(119		)	(125		)	(17		)	(19		)
Net periodic benefit expense	$	55		$	21		$	(41	)	$	21		$	101		$	63		$	(15	)	$	56