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Retirement Plans
 9 Months Ended
Feb. 28, 2019
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 February 28 were as follows (in millions):

 

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

2019

 

 

2018

 

 

2019

 

 

2018

 

Defined benefit pension plans, net

 

$

28

 

 

$

39

 

 

$

85

 

 

$

113

 

Defined contribution plans

 

 

138

 

 

 

135

 

 

 

415

 

 

 

386

 

Postretirement healthcare plans

 

 

19

 

 

 

19

 

 

 

56

 

 

 

56

 

 

 

$

185

 

 

$

193

 

 

$

556

 

 

$

555

 

 

Net periodic benefit cost of the pension and postretirement healthcare plans for the periods ended February 28 included the following components (in millions):

 

 

Three Months Ended

 

 

 

U.S. Pension Plans

 

 

International Pension Plans

 

 

Postretirement Healthcare Plans

 

 

 

2019

 

 

2018

 

 

2019

 

 

2018

 

 

2019

 

 

2018

 

Service cost

 

$

173

 

 

$

169

 

 

$

23

 

 

$

23

 

 

$

9

 

 

$

9

 

Other retirement plans (income) expense:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    Interest cost

 

 

237

 

 

 

279

 

 

 

13

 

 

 

12

 

 

 

10

 

 

 

10

 

    Expected return on plan assets

 

 

(376

)

 

 

(406

)

 

 

(12

)

 

 

(10

)

 

 

—

 

 

 

—

 

   Amortization of prior service credit and other

 

 

(30

)

 

 

(29

)

 

 

—

 

 

 

1

 

 

 

—

 

 

 

—

 

 

 

 

(169

)

 

 

(156

)

 

 

1

 

 

 

3

 

 

 

10

 

 

 

10

 

 

 

$

4

 

 

$

13

 

 

$

24

 

 

$

26

 

 

$

19

 

 

$

19

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Nine Months Ended

 

 

 

U.S. Pension Plans

 

 

International Pension Plans

 

 

Postretirement Healthcare Plans

 

 

 

2019

 

 

2018

 

 

2019

 

 

2018

 

 

2019

 

 

2018

 

Service cost

 

$

517

 

 

$

509

 

 

$

72

 

 

$

69

 

 

$

26

 

 

$

27

 

Other retirement plans (income) expense:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    Interest cost

 

 

713

 

 

 

836

 

 

 

38

 

 

 

37

 

 

 

30

 

 

 

29

 

    Expected return on plan assets

 

 

(1,129

)

 

 

(1,218

)

 

 

(36

)

 

 

(32

)

 

 

—

 

 

 

—

 

   Amortization of prior service credit and other

 

 

(89

)

 

 

(88

)

 

 

(1

)

 

 

—

 

 

 

—

 

 

 

—

 

 

 

 

(505

)

 

 

(470

)

 

 

1

 

 

 

5

 

 

 

30

 

 

 

29

 

 

 

$

12

 

 

$

39

 

 

$

73

 

 

$

74

 

 

$

56

 

 

$

56

 

Contributions to our U.S. Pension Plans for the nine-month periods ended February 28 were as follows (in millions):

 

 

2019

 

 

2018

 

Required

 

$

—

 

 

$

22

 

Voluntary

 

 

1,000

 

 

 

2,478

 

 

 

$

1,000

 

 

$

2,500