Retirement Plans

3 Months Ended

Aug. 31, 2019

Compensation And Retirement Disclosure [Abstract]

(5) Retirement Plans

We sponsor programs that provide retirement benefits to most of our employees. These programs include defined benefit pension plans, defined contribution plans and postretirement healthcare plans. Key terms of our retirement plans are provided in our Annual Report.

Our retirement plans costs for the three-month periods ended August 31 were as follows (in millions):

	2019		2018
Defined benefit pension plans, net	$	37	$	28
Defined contribution plans		142		144
Postretirement healthcare plans		22		19
	$	201	$	191

Net periodic benefit cost of the pension and postretirement healthcare plans for the three-month periods ended August 31 included the following components (in millions):

	U.S. Pension Plans						International Pension Plans						Postretirement Healthcare Plans
	2019			2018			2019			2018			2019		2018
Service cost	$	192		$	172		$	24		$	24		$	11	$	9
Other retirement plans (income) expense:
Interest cost		250			238			11			13			11		10
Expected return on plan assets		(400	)		(377	)		(13	)		(12	)		—		—
Amortization of prior service credit and other		(27	)		(29	)		—			(1	)		—		—
		(177	)		(168	)		(2	)		—			11		10
	$	15		$	4		$	22		$	24		$	22	$	19

We made voluntary contributions to our U.S. Pension Plans of $1.0 billion during the first quarter of 2020 and $250 million during the first quarter of 2019.