Retirement Plans (Tables)

6 Months Ended

Nov. 30, 2018

Retirement Plan Tables [Abstract]

Schedule of Retirement Plan Costs

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

Schedule of Net Periodic Benefit Cost

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

Schedule of Tax Qualified Pension Plans Contributions

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