Pension & Postretirement Expenses (Tables)

9 Months Ended

Jun. 30, 2017

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 June 30,						Nine Months Ended June 30,
		2016			2017			2016		2017
Service cost		$	22		21			67		63
Interest cost		50			42			149		126
Expected return on plan assets		(88		)	(86	)		(264	)	(258	)
Net amortization		40			53			121		159
Total		$	24		30			73		90