Pension & Postretirement Expenses (Tables)

6 Months Ended

Mar. 31, 2016

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 March 31,					Six Months Ended March 31,
	2015			2016		2015		2016
Service cost	$	27		23		54		45
Interest cost	61			49		121		99
Expected return on plan assets	(92		)	(88	)	(184	)	(176	)
Net amortization	42			41		85		81
Total	$	38		25		76		49