Accumulated Other Comprehensive Income - Reclassification out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	$ 88	$ 17	$ 168	$ 82
Revenues	8,432	8,032	25,673	24,132
Cost of sales	(4,682)	(4,343)	(14,184)	(12,947)
Total selling and administrative expense	(2,496)	(2,566)	(7,898)	(7,703)
Interest expense (income), net	(19)	(5)	(41)	(14)
Income before income taxes	1,323	1,135	3,718	3,550
Tax (expense) benefit	(182)	(185)	(486)	(636)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
NET INCOME	185	201	515	524
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income | Foreign Currency Translation Adjustment
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	1	(2)	1	(2)
Income before income taxes	1	(2)	1	(2)
Tax (expense) benefit	0	0	0	0
NET INCOME	1	(2)	1	(2)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income | Gain (losses) on cash flow hedges
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	176	202	495	525
Tax (expense) benefit	1	(3)	3	(4)
NET INCOME	177	199	498	521
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income | Gain (losses) on cash flow hedges | Foreign exchange forwards and options
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	67	73	141	173
Revenues	24	(24)	96	(99)
Cost of sales	87	153	260	451
Total selling and administrative expense	0	0	0	0
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income | Gain (losses) on cash flow hedges | Interest rate swaps
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense (income), net	(2)	0	(2)	0
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income | Other
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense, net	9	4	17	5
Income before income taxes	9	4	17	5
Tax (expense) benefit	(2)	0	(1)	0
NET INCOME	$ 7	$ 4	$ 16	$ 5