Willis Towers Watson sponsors both qualified and non-qualified defined benefit pension plans and other post-retirement welfare (‘PRW’) plans throughout the world. The majority of our plan assets and obligations are in the U.S. and the U.K. We have also included disclosures related to defined benefit plans in certain other countries, including Canada, France, Germany and Ireland. Together, these disclosed funded and unfunded plans represent 99% of Willis Towers Watson’s pension and PRW obligations and are disclosed herein.

Components of Net Periodic Benefit (Income)/Cost for Defined Benefit Pension and Post-retirement Welfare Plans

The following tables set forth the components of net periodic benefit (income)/cost for the Company’s defined benefit pension and PRW plans for the three and six months ended June 30, 2019 and 2018:

	Three Months Ended June 30,
	2019												2018
	U.S.			U.K.			Other			PRW			U.S.			U.K.			Other			PRW
Service cost	$	16		$	3		$	5		$	—		$	17		$	5		$	5		$	—
Interest cost		39			23			5			1			35			24			4			1
Expected return on plan assets		(63	)		(62	)		(8	)		—			(69	)		(77	)		(7	)		—
Settlement		—			—			—			—			—			20			—			—
Amortization of net loss		5			5			—			—			3			12			1			—
Amortization of prior service credit		—			(4	)		—			(1	)		—			(5	)		—			—
Net periodic benefit (income)/cost	$	(3	)	$	(35	)	$	2		$	—		$	(14	)	$	(21	)	$	3		$	1

	Six Months Ended June 30,
	2019												2018
	U.S.			U.K.			Other			PRW			U.S.			U.K.			Other			PRW
Service cost	$	32		$	7		$	10		$	—		$	33		$	10		$	10		$	—
Interest cost		79			47			9			2			70			48			9			2
Expected return on plan assets		(127	)		(125	)		(15	)		—			(137	)		(155	)		(15	)		—
Settlement		—			—			—			—			—			20			—			—
Amortization of net loss		10			10			1			—			6			24			1			—
Amortization of prior service credit		—			(8	)		—			(2	)		—			(10	)		—			—
Net periodic benefit (income)/cost	$	(6	)	$	(69	)	$	5		$	—		$	(28	)	$	(63	)	$	5		$	2

The Company made no contributions to its U.S. plans for the six months ended June 30, 2019 and anticipates making $60 million in contributions over the remainder of the fiscal year. The Company made contributions of $37 million to its U.K. plans for the six months ended June 30, 2019 and anticipates making additional contributions of $39 million for the remainder of the fiscal year. The Company made contributions of $18 million to its other plans for the six months ended June 30, 2019 and anticipates making additional contributions of $5 million for the remainder of the fiscal year.

The Company made contributions to its defined contribution plans of $37 million and $78 million during the three and six months ended June 30, 2019, respectively, and $41 million and $89 million during the three and six months ended June 30, 2018, respectively.