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Retirement Plans
 6 Months Ended
Nov. 30, 2018
Compensation And Retirement Disclosure [Abstract]  
Retirement Plans

(6) 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 periods ended November 30 were as follows (in millions):

 

 

 

Three Months Ended

 

 

Six Months Ended

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Defined benefit pension plans, net

 

$

29

 

 

$

37

 

 

$

57

 

 

$

74

 

Defined contribution plans

 

 

133

 

 

 

124

 

 

 

277

 

 

 

251

 

Postretirement healthcare plans

 

 

18

 

 

 

18

 

 

 

37

 

 

 

37

 

 

 

$

180

 

 

$

179

 

 

$

371

 

 

$

362

 

 

Net periodic benefit cost of the pension and postretirement healthcare plans for the periods ended November 30 included the following components (in millions):

 

 

Three Months Ended

 

 

 

U.S. Pension Plans

 

 

International Pension Plans

 

 

Postretirement Healthcare Plans

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Service cost

 

$

172

 

 

$

170

 

 

$

25

 

 

$

23

 

 

$

8

 

 

$

9

 

Other retirement plans (income) expense:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    Interest cost

 

 

238

 

 

 

278

 

 

 

12

 

 

 

13

 

 

 

10

 

 

 

9

 

    Expected return on plan assets

 

 

(376

)

 

 

(406

)

 

 

(12

)

 

 

(11

)

 

 

—

 

 

 

—

 

   Amortization of prior service credit and other

 

 

(30

)

 

 

(29

)

 

 

—

 

 

 

(1

)

 

 

—

 

 

 

—

 

 

 

 

(168

)

 

 

(157

)

 

 

—

 

 

 

1

 

 

 

10

 

 

 

9

 

 

 

$

4

 

 

$

13

 

 

$

25

 

 

$

24

 

 

$

18

 

 

$

18

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Six Months Ended

 

 

 

U.S. Pension Plans

 

 

International Pension Plans

 

 

Postretirement Healthcare Plans

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Service cost

 

$

344

 

 

$

340

 

 

$

49

 

 

$

46

 

 

$

17

 

 

$

18

 

Other retirement plans (income) expense:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    Interest cost

 

 

476

 

 

 

557

 

 

 

25

 

 

 

25

 

 

 

20

 

 

 

19

 

    Expected return on plan assets

 

 

(753

)

 

 

(812

)

 

 

(24

)

 

 

(22

)

 

 

—

 

 

 

—

 

   Amortization of prior service credit and other

 

 

(59

)

 

 

(59

)

 

 

(1

)

 

 

(1

)

 

 

—

 

 

 

—

 

 

 

 

(336

)

 

 

(314

)

 

 

—

 

 

 

2

 

 

 

20

 

 

 

19

 

 

 

$

8

 

 

$

26

 

 

$

49

 

 

$

48

 

 

$

37

 

 

$

37

 

Contributions to our tax-qualified U.S. domestic pension plans for the six-month periods ended November 30 were as follows (in millions):

 

 

2018

 

 

2017

 

Required

 

$

—

 

 

$

268

 

Voluntary

 

 

500

 

 

 

482

 

 

 

$

500

 

 

$

750