Condensed Consolidating Financial Statements (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended													12 Months Ended
	May 31, 2013		Feb. 28, 2013		Nov. 30, 2012		Aug. 31, 2012	May 31, 2012		Feb. 29, 2012		Nov. 30, 2011	Aug. 31, 2011	May 31, 2013	May 31, 2012	May 31, 2011
Condensed Financial Statements Captions [Line Items]
REVENUES	$ 11,435		$ 10,953		$ 11,107		$ 10,792	$ 11,008		$ 10,564		$ 10,587	$ 10,521	$ 44,287	$ 42,680	$ 39,304
OPERATING EXPENSES:
Salaries and employee benefits														16,570	16,099	15,276
Purchased transportation														7,272	6,335	5,674
Rentals and landing fees														2,521	2,487	2,462
Depreciation and amortization														2,386	2,113	1,973
Fuel														4,746	4,956	4,151
Maintenance and repairs														1,909	1,980	1,979
Business realignment, impairment and other charges														660	134	89
Other														5,672	5,390	5,322
OPERATING EXPENSES														41,736	39,494	36,926
OPERATING INCOME	502	[1]	589	[1]	718	[1]	742	856	[2]	813	[2]	780	737	2,551	3,186	2,378
OTHER INCOME (EXPENSE):
Interest, net														(61)	(39)	(77)
Other, net														(35)	(6)	(36)
INCOME BEFORE INCOME TAXES														2,455	3,141	2,265
PROVISION FOR INCOME TAXES														894	1,109	813
NET INCOME	303	[1]	361	[1]	438	[1]	459	550	[2]	521	[2]	497	464	1,561	2,032	1,452
COMPREHENSIVE INCOME (LOSS)														2,694	(371)	1,342
Parent Company [Member]
OPERATING EXPENSES:
Salaries and employee benefits														103	114	109
Rentals and landing fees														5	5	4
Depreciation and amortization														1	1	1
Maintenance and repairs														1	1	1
Business realignment, impairment and other charges														21
Intercompany charges, net														(227)	(218)	(222)
Other														96	97	107
OTHER INCOME (EXPENSE):
Equity in earnings of subsidiaries														1,561	2,032	1,452
Interest, net														(108)	(75)	(88)
Intercompany charges, net														113	80	104
Other, net														(5)	(5)	(16)
INCOME BEFORE INCOME TAXES														1,561	2,032	1,452
NET INCOME														1,561	2,032	1,452
COMPREHENSIVE INCOME (LOSS)														2,622	(120)	1,240
Guarantor Subsidiaries [Member]
Condensed Financial Statements Captions [Line Items]
REVENUES														37,073	36,412	33,124
OPERATING EXPENSES:
Salaries and employee benefits														14,375	14,153	13,206
Purchased transportation														4,839	4,509	4,034
Rentals and landing fees														2,198	2,221	2,209
Depreciation and amortization														2,200	1,962	1,784
Fuel														4,650	4,877	4,003
Maintenance and repairs														1,791	1,882	1,862
Business realignment, impairment and other charges														639	134	28
Intercompany charges, net														(329)	(323)	(317)
Other														4,565	4,482	4,392
OPERATING EXPENSES														34,928	33,897	31,201
OPERATING INCOME														2,145	2,515	1,923
OTHER INCOME (EXPENSE):
Equity in earnings of subsidiaries														253	395	200
Interest, net														42	31	13
Intercompany charges, net														(131)	(102)	(135)
Other, net														(20)	(10)	(14)
INCOME BEFORE INCOME TAXES														2,289	2,829	1,987
PROVISION FOR INCOME TAXES														710	875	677
NET INCOME														1,579	1,954	1,310
COMPREHENSIVE INCOME (LOSS)														1,618	1,796	1,329
Non Guarantor Subsidiaries [Member]
Condensed Financial Statements Captions [Line Items]
REVENUES														7,543	6,569	6,498
OPERATING EXPENSES:
Salaries and employee benefits														2,092	1,832	1,961
Purchased transportation														2,574	1,944	1,745
Rentals and landing fees														324	267	253
Depreciation and amortization														185	150	188
Fuel														96	79	148
Maintenance and repairs														117	97	116
Business realignment, impairment and other charges																61
Intercompany charges, net														556	541	539
Other														1,193	988	1,032
OPERATING EXPENSES														7,137	5,898	6,043
OPERATING INCOME														406	671	455
OTHER INCOME (EXPENSE):
Interest, net														5	5	(2)
Intercompany charges, net														18	22	31
Other, net														(10)	9	(6)
INCOME BEFORE INCOME TAXES														419	707	478
PROVISION FOR INCOME TAXES														184	234	136
NET INCOME														235	473	342
COMPREHENSIVE INCOME (LOSS)														268	380	425
Consolidation Eliminations [Member]
Condensed Financial Statements Captions [Line Items]
REVENUES														(329)	(301)	(318)
OPERATING EXPENSES:
Purchased transportation														(141)	(118)	(105)
Rentals and landing fees														(6)	(6)	(4)
Other														(182)	(177)	(209)
OPERATING EXPENSES														(329)	(301)	(318)
OTHER INCOME (EXPENSE):
Equity in earnings of subsidiaries														(1,814)	(2,427)	(1,652)
INCOME BEFORE INCOME TAXES														(1,814)	(2,427)	(1,652)
NET INCOME														(1,814)	(2,427)	(1,652)
COMPREHENSIVE INCOME (LOSS)														$ (1,814)	$ (2,427)	$ (1,652)

[1] The fourth quarter of 2013 includes $496 million of business realignment costs and an impairment charge of $100 million resulting from the decision to retire 10 aircraft and related engines at FedEx Express. The third quarter of 2013 includes $47 million of business realignment costs. The second quarter of 2013 includes $13 million of business realignment costs.

[2] The fourth quarter of 2012 includes an impairment charge of $134 million resulting from the decision to retire 24 aircraft and related engines at FedEx Express. The third quarter of 2012 includes the reversal of a $66 million legal reserve.