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Retirement Plans (Tables)
9 Months Ended
Feb. 28, 2018
Retirement Plan Tables [Abstract]  
Schedule of Retirement Plan Costs

Our retirement plans costs for the periods ended February 28 were as follows (in millions):

 

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Defined benefit pension plans

 

$

39

 

 

$

57

 

 

$

113

 

 

$

173

 

Defined contribution plans

 

 

135

 

 

 

117

 

 

 

386

 

 

 

348

 

Postretirement healthcare plans

 

 

19

 

 

 

19

 

 

 

56

 

 

 

57

 

 

 

$

193

 

 

$

193

 

 

$

555

 

 

$

578

 

 

Schedule of Net Periodic Benefit Cost

 

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

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Service cost

 

$

169

 

 

$

160

 

 

$

23

 

 

$

20

 

 

$

9

 

 

$

9

 

Interest cost

 

 

279

 

 

 

282

 

 

 

12

 

 

 

11

 

 

 

10

 

 

 

10

 

Expected return on plan assets

 

 

(406

)

 

 

(375

)

 

 

(10

)

 

 

(9

)

 

 

 

 

 

 

Amortization of prior service credit and other

 

 

(29

)

 

 

(30

)

 

 

1

 

 

 

(2

)

 

 

 

 

 

 

 

 

$

13

 

 

$

37

 

 

$

26

 

 

$

20

 

 

$

19

 

 

$

19

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Nine Months Ended

 

 

 

U.S. Pension Plans

 

 

International Pension Plans

 

 

Postretirement Healthcare Plans

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Service cost

 

$

509

 

 

$

479

 

 

$

69

 

 

$

61

 

 

$

27

 

 

$

27

 

Interest cost

 

 

836

 

 

 

846

 

 

 

37

 

 

 

33

 

 

 

29

 

 

 

30

 

Expected return on plan assets

 

 

(1,218

)

 

 

(1,126

)

 

 

(32

)

 

 

(30

)

 

 

 

 

 

 

Amortization of prior service credit and other

 

 

(88

)

 

 

(89

)

 

 

 

 

 

(1

)

 

 

 

 

 

 

 

 

$

39

 

 

$

110

 

 

$

74

 

 

$

63

 

 

$

56

 

 

$

57

 

 

Schedule of Contributions to Pension Plans

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

 

 

2018

 

 

2017

 

Required

 

$

22

 

 

$

444

 

Voluntary

 

 

2,478

 

 

 

1,306

 

 

 

$

2,500

 

 

$

1,750