Pension & Postretirement Expenses (Tables)

3 Months Ended

Dec. 31, 2015

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Summary of Pension and Postretirement Plan Expenses

Total periodic pension and postretirement expense is summarized below (in millions):

	Three Months Ended December 31,
	2014			2015
Service cost	$	27		22
Interest cost	60			50
Expected return on plan assets	(92		)	(88	)
Net amortization	43			40
Total	$	38		24