Summary of Significant Accounting Policies - Revisions (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	May 31, 2014
Short-term investments	$ 2,276		$ 2,922
Net Income (Loss) [Abstract]
Total selling and administrative expense	2,480	2,058
Total before tax	1,229	1,038
Income tax expense	267	259
Net income	962	779
Basic earnings per common share for NIKE, Inc. (in dollars per share)	$ 1.11	$ 0.88
Diluted earnings per common share for NIKE, Inc. (in dollars per share)	$ 1.09	$ 0.86
Comprehensive Income [Abstract]
Net income	962	779
TOTAL COMPREHENSIVE INCOME	1,101	682
Cash provided by operations:
Net income	962	779
Amortization and other	(34)	30
(Increase) in inventories	(111)	(61)
(Decrease) in accounts payable, accrued liabilities and income taxes	(251)	(114)
Cash provided by operations	588	618
Cash provided (used) by investing activities:
Purchases of short-term investments	(1,296)	(1,417)
Sales of short-term investments	762	250
Additions to property, plant and equipment	262	245
Increase in other assets, net of other liabilities	0	(1)
Cash (used) provided by investing activities	280	(694)
Cash used by financing activities:
(Decrease) increase in notes payable	(17)	3
Cash used by financing activities	(882)	(592)
Net increase (decrease) in cash and equivalents	83	(676)
Cash and equivalents, beginning of period	2,220	3,337
CASH AND EQUIVALENTS, END OF PERIOD	2,303	2,661
As Reported
Net Income (Loss) [Abstract]
Total selling and administrative expense		2,056
Total before tax		1,040
Income tax expense		260
Net income		780
Basic earnings per common share for NIKE, Inc. (in dollars per share)		$ 0.88
Diluted earnings per common share for NIKE, Inc. (in dollars per share)		$ 0.86
Comprehensive Income [Abstract]
Net income		780
TOTAL COMPREHENSIVE INCOME		683
Cash provided by operations:
Net income		780
Amortization and other		31
(Increase) in inventories		(63)
(Decrease) in accounts payable, accrued liabilities and income taxes		(135)
Cash provided by operations		597
Cash provided (used) by investing activities:
Purchases of short-term investments		(1,328)
Sales of short-term investments		436
Additions to property, plant and equipment		215
Increase in other assets, net of other liabilities		(4)
Cash (used) provided by investing activities		(392)
Cash used by financing activities:
(Decrease) increase in notes payable		(3)
Cash used by financing activities		(598)
Net increase (decrease) in cash and equivalents		(401)
Cash and equivalents, beginning of period		3,337
CASH AND EQUIVALENTS, END OF PERIOD		2,936
Adjustment
Net Income (Loss) [Abstract]
Total selling and administrative expense		2
Total before tax		(2)
Income tax expense		(1)
Net income		(1)
Basic earnings per common share for NIKE, Inc. (in dollars per share)		$ 0.00
Diluted earnings per common share for NIKE, Inc. (in dollars per share)		$ 0.00
Comprehensive Income [Abstract]
Net income		(1)
TOTAL COMPREHENSIVE INCOME		(1)
Cash provided by operations:
Net income		(1)
Amortization and other		(1)
(Increase) in inventories		2
(Decrease) in accounts payable, accrued liabilities and income taxes		21
Cash provided by operations		21
Cash provided (used) by investing activities:
Purchases of short-term investments		(89)
Sales of short-term investments		(186)
Additions to property, plant and equipment		30
Increase in other assets, net of other liabilities		3
Cash (used) provided by investing activities		(302)
Cash used by financing activities:
(Decrease) increase in notes payable		6
Cash used by financing activities		6
Net increase (decrease) in cash and equivalents		(275)
Cash and equivalents, beginning of period		0
CASH AND EQUIVALENTS, END OF PERIOD		(275)
Prior Year Revision To Capitalized Costs | Adjustment
Net Income (Loss) [Abstract]
Net income		(1)
Comprehensive Income [Abstract]
Net income		(1)
Cash provided by operations:
Net income		(1)
Cash provided by operations		(3)
Cash provided (used) by investing activities:
Cash (used) provided by investing activities		3
Prior Year Revision To Short-term Investments | Adjustment
Short-term investments		275
Cash provided (used) by investing activities:
Purchases of short-term investments		(89)
Sales of short-term investments		(186)
Cash (used) provided by investing activities		275
Cash used by financing activities:
CASH AND EQUIVALENTS, END OF PERIOD		(275)
Prior Year Revision to Inventory Amounts | Adjustment
Cash flow impact on accrued liabilities		2
Cash provided by operations:
(Increase) in inventories		2
Prior Period Revisions to Non-cash Property Plant And Equipment Additions | Adjustment
Cash provided (used) by investing activities:
Additions to property, plant and equipment		$ 30