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Retirement Plans (Tables)
 3 Months Ended
Aug. 31, 2017
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):

 

 

 

2017

 

 

2016

 

Defined benefit pension plans

 

$

37

 

 

$

58

 

Defined contribution plans

 

 

127

 

 

 

119

 

Postretirement healthcare plans

 

 

19

 

 

 

19

 

 

 

$

183

 

 

$

196

 

 
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

 

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

    Service cost

 

$

170

 

 

$

160

 

 

$

23

 

 

$

20

 

 

$

9

 

 

$

9

 

    Interest cost

 

 

279

 

 

 

282

 

 

 

12

 

 

 

11

 

 

 

10

 

 

 

10

 

    Expected return on plan assets

 

 

(406

)

 

 

(375

)

 

 

(11

)

 

 

(11

)

 

 

—

 

 

 

—

 

    Amortization of prior service credit and other

 

 

(30

)

 

 

(30

)

 

 

—

 

 

 

1

 

 

 

—

 

 

 

—

 

 

 

$

13

 

 

$

37

 

 

$

24

 

 

$

21

 

 

$

19

 

 

$

19

 

 
Schedule of Tax Qualified Pension Plans Contributions

Contributions to our tax-qualified U.S. domestic pension plans (“U.S. Pension Plans”) for the three-month periods ended August 31 were as follows (in millions):

 

 

 

2017

 

 

2016

 

Required

 

$

—

 

 

$

—

 

Voluntary

 

 

250

 

 

 

250

 

 

 

$

250

 

 

$

250