Retirement Benefit Liabilities (Tables)

6 Months Ended

Mar. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Summary of retirement benefit liabilities

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

	March 31, 2015			September 30, 2014
Retiree medical liability	$	468		$	479
Pension liability	297			323
Other	15			16
Subtotal	780			818
Less: current portion (included in compensation and benefits, Note 14)	(43		)	(43		)
Retirement benefits	$	737		$	775

Components of net periodic pension and retiree medical expense

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

	2015					2014
	Pension			Retiree Medical		Pension			Retiree Medical
Interest cost	18			5		20			7
Assumed return on plan assets	(28		)	—		(26		)	—
Amortization of prior service costs	—			—		—			(2		)
Recognized actuarial loss	7			5		6			5
Total expense (income)	$	(3	)	$	10	$	—		$	10

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

	2015					2014
	Pension			Retiree Medical		Pension			Retiree Medical
Interest cost	36			10		40			13
Assumed return on plan assets	(56		)	—		(52		)	—
Amortization of prior service costs	—			—		—			(4		)
Recognized actuarial loss	14			10		12			11
Total expense	$	(6	)	$	20	$	—		$	20