Retirement and Post-Retirement Benefit Plans (Tables)

9 Months Ended

Jul. 31, 2020

Retirement Benefits [Abstract]

Schedule of Pension and Post-Retirement Benefit (Credit) Cost

The components of HP’s pension and post-retirement benefit (credit) cost recognized in the Consolidated Condensed Statements of Earnings were as follows:

	Three months ended July 31
	U.S. Defined Benefit Plans				Non-U.S. Defined Benefit Plans				Post-Retirement Benefit Plans
	2020		2019		2020		2019		2020		2019
	In millions
Service cost	$	—	$	—	$	16	$	14	$	—	$	—
Interest cost	103		123		4		6		3		4
Expected return on plan assets	(175)		(146)		(10)		(9)		(6)		(5)
Amortization and deferrals:
Actuarial loss (gain)	16		15		11		8		(3)		(8)
Prior service benefit	—		—		(1)		(1)		(3)		(3)
Net periodic (credit) benefit cost	(56)		(8)		20		18		(9)		(12)
Curtailment gain	—		—		—		(9)		—		—
Settlement loss	2		1		—		—		—		—
Total periodic (credit) benefit cost	$	(54)	$	(7)	$	20	$	9	$	(9)	$	(12)
	Nine months ended July 31
	U.S. Defined Benefit Plans				Non-U.S. Defined Benefit Plans				Post- Retirement Benefit Plans
	2020		2019		2020		2019		2020		2019
	In millions
Service cost	$	—	$	—	$	47	$	43	$	1	$	—
Interest cost	309		369		13		18		8		12
Expected return on plan assets	(525)		(437)		(31)		(28)		(17)		(15)
Amortization and deferrals:
Actuarial loss (gain)	48		45		32		24		(8)		(24)
Prior service benefit	—		—		(2)		(2)		(9)		(9)
Net periodic (credit) benefit cost	(168)		(23)		59		55		(25)		(36)
Curtailment gain	—		—		—		(9)		—		—
Settlement loss	3		2		—		—		—		—
Special termination benefit cost	—		—		—		—		44		—
Total periodic (credit) benefit cost	$	(165)	$	(21)	$	59	$	46	$	19	$	(36)