Retirement Benefit Liabilities (Tables)

6 Months Ended

Mar. 31, 2022

Retirement Benefits [Abstract]

Schedule of Retirement Benefit Liabilities

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

	March 31, 2022		September 30, 2021
Retiree medical liability	$	41	$	42
Pension liability	122		141
Other	19		19
Subtotal	182		202
Less: current portion (included in compensation and benefits, Note 11)	(11)		(11)
Retirement benefits	$	171	$	191

Schedule of 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 March 31 are as follows (in millions):

	2022				2021
	Pension		Retiree Medical		Pension		Retiree Medical
Interest cost	$	(10)	$	(1)	$	(8)	$	(1)
Assumed return on plan assets	25		—		24		—
Amortization of prior service benefit	—		9		—		9
Recognized actuarial loss	(7)		(2)		(8)		(3)
Total income	$	8	$	6	$	8	$	5

The components of net periodic pension and retiree medical income included in continuing operations for the six months ended March 31 are as follows (in millions):

	2022				2021
	Pension		Retiree Medical		Pension		Retiree Medical
Interest cost	$	(19)	$	(1)	$	(17)	$	(1)
Assumed return on plan assets	49		—		48		—
Amortization of prior service benefit	—		17		—		18
Recognized actuarial loss	(14)		(5)		(16)		(6)
Total income	$	16	$	11	$	15	$	11