Retirement Benefit Liabilities (Tables)

9 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Summary of retirement benefit liabilities

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

	June 30, 2015			September 30, 2014
Retiree medical liability	$	463		$	479
Pension liability	293			323
Other	16			16
Subtotal	772			818
Less: current portion (included in compensation and benefits, Note 14)	(43		)	(43		)
Retirement benefits	$	729		$	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 June 30 are as follows (in millions):

	2015						2014
	Pension			Retiree Medical			Pension			Retiree Medical
Service cost	$	1		$	—		$	1		$	—
Interest cost	17			5			19			6
Assumed return on plan assets	(28		)	—			(26		)	—
Amortization of prior service costs	—			(1		)	—			(2		)
Recognized actuarial loss	6			6			6			6
Total expense (income)	$	(4	)	$	10		$	—		$	10

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

	2015						2014
	Pension			Retiree Medical			Pension			Retiree Medical
Service cost	$	1		$	—		$	1		$	—
Interest cost	53			15			59			19
Assumed return on plan assets	(84		)	—			(78		)	—
Amortization of prior service costs	—			(1		)	—			(6		)
Recognized actuarial loss	20			16			18			17
Total expense (income)	$	(10	)	$	30		$	—		$	30