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Retirement Plans (Tables)
 3 Months Ended
Aug. 31, 2019
Retirement Plan Tables [Abstract]  
Schedule of Retirement Plan Costs

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

 
Schedule of Net Periodic Benefit Cost

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