Summary of Significant Accounting Policies - Revisions (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013	May 31, 2014
Short-term investments	$ 2,440		$ 2,440		$ 2,922
Net Income (Loss) [Abstract]
Total selling and administrative expense	2,438	2,091	4,918	4,149
Total before tax	878	714	2,107	1,752
Income tax expense	223	180	490	439
Net income	655	534	1,617	1,313
Basic earnings per common share for NIKE, Inc. (in dollars per share)	$ 0.76	$ 0.60	$ 1.87	$ 1.48
Diluted earnings per common share for NIKE, Inc. (in dollars per share)	$ 0.74	$ 0.59	$ 1.83	$ 1.44
Comprehensive Income [Abstract]
Net income	655	534	1,617	1,313
TOTAL COMPREHENSIVE INCOME	956	447	2,057	1,129
Cash provided by operations:
Net income	(655)	(534)	(1,617)	(1,313)
Deferred income taxes			49	24
Amortization and other			(54)	51
(Increase) in inventories			(318)	(277)
(Decrease) in accounts payable, accrued liabilities and income taxes payable			(217)	(283)
Cash provided by operations			1,235	948
Cash used by investing activities:
Purchases of short-term investments			2,588	2,848
Maturities of short-term investments			1,862	1,662
Sales of short-term investments			1,045	546
Additions to property, plant and equipment			487	449
Increase in other assets, net of other liabilities			0	(1)
Cash (used) provided by investing activities			(166)	(1,189)
Cash used by financing activities:
(Decrease) increase in notes payable			(58)	59
Cash used by financing activities			(1,304)	(997)
Net increase (decrease) in cash and equivalents			53	(1,251)
Cash and equivalents, beginning of period			2,220	3,337
CASH AND EQUIVALENTS, END OF PERIOD	2,273	2,086	2,273	2,086
As Reported
Net Income (Loss) [Abstract]
Total selling and administrative expense		2,088		4,144
Total before tax		717		1,757
Income tax expense		180		440
Net income		537		1,317
Basic earnings per common share for NIKE, Inc. (in dollars per share)		$ 0.60		$ 1.48
Diluted earnings per common share for NIKE, Inc. (in dollars per share)		$ 0.59		$ 1.45
Comprehensive Income [Abstract]
Net income		537		1,317
TOTAL COMPREHENSIVE INCOME		450		1,133
Cash provided by operations:
Net income		(537)		(1,317)
Deferred income taxes				23
Amortization and other				54
(Increase) in inventories				(280)
(Decrease) in accounts payable, accrued liabilities and income taxes payable				(305)
Cash provided by operations				929
Cash used by investing activities:
Purchases of short-term investments				2,759
Maturities of short-term investments				1,602
Sales of short-term investments				517
Additions to property, plant and equipment				428
Increase in other assets, net of other liabilities				(10)
Cash (used) provided by investing activities				(1,177)
Cash used by financing activities:
(Decrease) increase in notes payable				66
Cash used by financing activities				(990)
Net increase (decrease) in cash and equivalents				(1,251)
Cash and equivalents, beginning of period				3,337
CASH AND EQUIVALENTS, END OF PERIOD		2,086		2,086
Adjustment
Net Income (Loss) [Abstract]
Total selling and administrative expense		3		5
Total before tax		(3)		(5)
Income tax expense		0		(1)
Net income		(3)		(4)
Basic earnings per common share for NIKE, Inc. (in dollars per share)		$ 0.00		$ 0.00
Diluted earnings per common share for NIKE, Inc. (in dollars per share)		$ 0.00		$ (0.01)
Comprehensive Income [Abstract]
Net income		(3)		(4)
TOTAL COMPREHENSIVE INCOME		(3)		(4)
Cash provided by operations:
Net income		3		4
Deferred income taxes				1
Amortization and other				(3)
(Increase) in inventories				3
(Decrease) in accounts payable, accrued liabilities and income taxes payable				22
Cash provided by operations				19
Cash used by investing activities:
Purchases of short-term investments				89
Maturities of short-term investments				60
Sales of short-term investments				29
Additions to property, plant and equipment				21
Increase in other assets, net of other liabilities				9
Cash (used) provided by investing activities				(12)
Cash used by financing activities:
(Decrease) increase in notes payable				(7)
Cash used by financing activities				(7)
Net increase (decrease) in cash and equivalents				0
Cash and equivalents, beginning of period				0
CASH AND EQUIVALENTS, END OF PERIOD		0		0
Prior Year Revision To Capitalized Costs | Adjustment
Net Income (Loss) [Abstract]
Net income		(3)		(4)
Comprehensive Income [Abstract]
Net income		(3)		(4)
Cash provided by operations:
Net income		3		4
Cash provided by operations				(9)
Cash used by investing activities:
Cash (used) provided by investing activities				(9)
Prior Year Revision To Short-term Investments | Adjustment
Cash used by investing activities:
Purchases of short-term investments				89
Maturities of short-term investments				60
Sales of short-term investments				29
Prior Year Revision to Inventory Amounts | Adjustment
Cash flow impact on accrued liabilities				(3)
Cash provided by operations:
(Increase) in inventories				3
Prior Period Revisions to Non-cash Property Plant And Equipment Additions | Adjustment
Cash provided by operations:
Cash provided by operations				$ 21