Net periodic benefit expense included in our Consolidated Statements of Operations, and other amounts recognized in our Consolidated Statements of Stockholders' Deficit, for the three and six months ended April 30, 2018 and 2017 is comprised of the following:



	Three Months Ended April 30,												Six Months Ended April 30,
	Pension Benefits						Health and Life Insurance Benefits						Pension Benefits						Health and Life Insurance Benefits
(in millions)	2018			2017			2018			2017			2018			2017			2018			2017
Service cost for benefits earned during the period	$	2		$	2		$	1		$	2		$	4		$	4		$	2		$	3
Interest on obligation	27			26			11			12			54			53			22			24
Amortization of cumulative loss	27			30			2			5			53			59			4			11
Settlements	—			—			—			—			9			—			—			—
Contractual termination benefits	—			—			—			—			—			1			—			—
Premiums on pension insurance	—			4			—			—			2			8			—			—
Expected return on assets	(41		)	(39		)	(6		)	(6		)	(81		)	(79		)	(12		)	(12		)
Net periodic benefit expense	$	15		$	23		$	8		$	13		$	41		$	46		$	16		$	26