Benefit Plans (Tables)

6 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Net Pension and Postretirement Cost

Net pension and postretirement cost included the following components for the three months ended March 31:

	Pension Plans						Other Postretirement Benefits
(Millions of dollars)	2016			2015			2016			2015
Service cost	$	20		$	19		$	1		$	1
Interest cost	18			21			1			2
Expected return on plan assets	(27		)	(30		)	—			—
Amortization of prior service credit	(4		)	(4		)	(1		)	(1		)
Amortization of loss	19			17			—			1
Settlements	1			—			—			—
Net pension and postretirement cost	$	27		$	23		$	1		$	2

Net pension and postretirement cost included the following components for the six months ended March 31:

	Pension Plans						Other Postretirement Benefits
(Millions of dollars)	2016			2015			2016			2015
Service cost	$	41		$	38		$	1		$	2
Interest cost	37			43			3			4
Expected return on plan assets	(55		)	(61		)	—			—
Amortization of prior service credit	(7		)	(8		)	(2		)	(2		)
Amortization of loss	39			34			1			1
Settlements	1			—			—			—
Net pension and postretirement cost	$	55		$	46		$	3		$	4