PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS

The following table summarizes the components of net periodic pension cost and the cost of other postretirement benefits for the periods presented:



	Three Months Ended June 30,
	United States Pension Benefits						Foreign Pension Benefits						Other Postretirement Benefits
Millions of dollars	2018			2017			2018			2017			2018			2017
Service cost	$	—		$	—		$	2		$	2		$	1		$	2
Interest cost	29			33			6			6			3			4
Expected return on plan assets	(42		)	(44		)	(9		)	(8		)	—			—
Amortization:
Actuarial loss	13			13			2			1			—			—
Prior service credit	—			—			—			—			(2		)	(3		)
Settlement and curtailment (gain) loss	—			—			(3		)	1			—			—
Net periodic benefit cost (credit)	$	—		$	2		$	(2	)	$	2		$	2		$	3



	Six Months Ended June 30,
	United States Pension Benefits						Foreign Pension Benefits						Other Postretirement Benefits
Millions of dollars	2018			2017			2018			2017			2018		2017
Service cost	$	1		$	1		$	3		$	3		$	3	$	4
Interest cost	59			67			12			11			7		8
Expected return on plan assets	(85		)	(88		)	(17		)	(15		)	—		—
Amortization:
Actuarial loss	26			25			5			3			—		—
Prior service credit	(1		)	(1		)	—			—			1		(7		)
Settlement and curtailment (gain) loss	—			—			(3		)	1			—		—
Net periodic cost	$	—		$	4		$	—		$	3		$	11	$	5

The following table summarizes the net periodic cost recognized in operating profit and interest and sundry (income) expense for the periods presented:



	Three Months Ended June 30,
	United States Pension Benefits				Foreign Pension Benefits					Other Postretirement Benefits
Millions of dollars	2018		2017		2018			2017		2018		2017
Operating profit (loss)	$	—	$	—	$	2		$	2	$	1	$	2
Interest and sundry (income) expense	—		2		(4		)	—		1		1
Net periodic benefit cost (credit)	$	—	$	2	$	(2	)	$	2	$	2	$	3



	Six Months Ended June 30,
	United States Pension Benefits					Foreign Pension Benefits					Other Postretirement Benefits
Millions of dollars	2018			2017		2018			2017		2018		2017
Operating profit (loss)	$	1		$	1	$	3		$	3	$	3	$	4
Interest and sundry (income) expense	(1		)	3		(3		)	—		8		1
Net periodic benefit cost (credit)	$	—		$	4	$	—		$	3	$	11	$	5

During the second quarter 2011, we modified retiree medical benefits for certain retirees to be consistent with those benefits provided by the Whirlpool Corporation Group Benefit Plan. We accounted for these changes as a plan amendment in 2011, resulting in a reduction in the postretirement benefit obligation of $138 million, of which approximately $87 million of benefit has been recognized in net earnings since 2011, with an offset to accumulated other comprehensive loss, net of tax. In response, a group of retirees initiated legal proceedings against Whirlpool asserting the above benefits are vested and changes to the plan are not permitted. We disagree with plaintiffs' assertion and are continuing to vigorously defend our position, including through any necessary appeal process. However, an unfavorable final result could require us to immediately reverse the benefit we have recognized to that point, and remeasure the associated postretirement benefit obligation, the impact of which will depend on timing and the actuarial assumptions then in effect.