General (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
General Details [Abstract]
Dividends Payable, Date Declared	Nov. 21, 2014
Dividends Payable Amount Per Share	$ 0.20us-gaap_DividendsPayableAmountPerShare		$ 0.20us-gaap_DividendsPayableAmountPerShare
Dividends Payable, Date To Be Paid	Jan. 02, 2015
Dividends Payable, Date Of Record	Dec. 12, 2014
Stock Based Compensation Details [Abstract]
Stock-based compensation	$ 31us-gaap_ShareBasedCompensation	$ 26us-gaap_ShareBasedCompensation	$ 79us-gaap_ShareBasedCompensation	$ 71us-gaap_ShareBasedCompensation
Treasury Shares [Abstract]
Number Of Shares Repurchased	1,000,000fdx_NumberOfSharesRepurchased		1,000,000fdx_NumberOfSharesRepurchased
Treasury Stock Acquired, Average Cost Per Share	$ 156.00
Stock Repurchase Authorization, Number of Shares Authorized to Be Repurchased	15,000,000		15,000,000
Stock Repurchase Authorization, Remaining Number of Shares	14,000,000		14,000,000
Purchase of treasury stock	$ 156		$ 947	$ 1,219

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The total numbers of common stock shares repurchased during the period.

+ References

No definition available.

+ Details

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- Details

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

+ Details

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- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

+ Details

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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

+ Details

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Balance Type:	credit
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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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