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 nine months ended July 31, 2018 and 2017 are 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)	2018			2017			2018			2017			2018			2017			2018			2017
Service cost for benefits earned during the period	$	1		$	2		$	1		$	1		$	5		$	6		$	3		$	4
Interest on obligation	27			27			10			11			81			80			32			35
Amortization of cumulative loss	26			30			3			6			79			89			7			17
Settlements	—			23			—			—			9			23			—			—
Contractual termination benefits	—			9			—			4			—			10			—			4
Curtailments and other	—			—			—			(58		)	—			—			—			(58		)
Premiums on pension insurance	1			4			—			—			3			12			—			—
Expected return on assets	(40		)	(40		)	(5		)	(5		)	(121		)	(119		)	(17		)	(17		)
Net periodic benefit expense	$	15		$	55		$	9		$	(41	)	$	56		$	101		$	25		$	(15	)