Retirement Plans (Details 3) (USD $) In Millions, unless otherwise specified	6 Months Ended
Nov. 30, 2011	Nov. 30, 2010
Pension Plans Contributions [Abstract]
Required U.S. retirement plan contributions	$ 226	$ 158
December 2011 U.S. Pension Plans contribution	127
Expected Quarterly Pension Contributions Remaining	$ 300

The employer's contributions paid to the plan in December 2011. Contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

No definition available.

Name:	fdx_DefinedBenefitPlanDecemberEmployerContributionsInCurrentFiscalYear
Namespace Prefix:	fdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant