Retirement Benefit Liabilities (Tables)

9 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Summary of Retirement Benefit Liabilities

Retirement benefit liabilities consisted of the following (in millions):

	June 30, 2020		September 30, 2019
Retiree medical liability	$	61	$	67
Pension liability	247		271
Other	17		14
Subtotal	325		352
Less: current portion (included in compensation and benefits, Note 15)	(17)		(16)
Retirement benefits	$	308	$	336

Components of Net Periodic Pension and Retiree Medical Income

The components of net periodic pension and retiree medical income included in continuing operations for the three months ended June 30 are as follows (in millions):

	2020				2019
	Pension		Retiree Medical		Pension		Retiree Medical
Interest cost	$	10	$	—	$	13	$	1
Assumed return on plan assets	(23)		—		(24)		—
Amortization of prior service benefit	—		(9)		—		(9)
Recognized actuarial loss	8		4		6		4
Total income	$	(5)	$	(5)	$	(5)	$	(4)

The components of net periodic pension and retiree medical income included in continuing operations for the nine months ended June 30 are as follows (in millions):

	2020				2019
	Pension		Retiree Medical		Pension		Retiree Medical
Interest cost	$	31	$	1	$	40	$	2
Assumed return on plan assets	(71)		—		(73)		—
Amortization of prior service benefit	—		(27)		—		(26)
Recognized actuarial loss	24		11		17		12
Total income	$	(16)	$	(15)	$	(16)	$	(12)