Retirement Plans (Details 3) (USD $) In Millions, unless otherwise specified	6 Months Ended
Nov. 30, 2012	Nov. 30, 2011
Pension Plans Contributions [Abstract]
Required U.S. pension plan contributions	$ 280	$ 226
December 2012 U.S. Pension Plans contribution	$ 140

The employer's contributions paid to the plan in December 2012. 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