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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2018 USD ($) | May 31, 2018 USD ($) air-craft $ / shares shares | May 31, 2017 USD ($) $ / shares shares | May 31, 2016 USD ($) $ / shares shares | Jan. 26, 2016 shares
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Advertising and promotion expenses |  | $ 442 | $ 458 | $ 417 |
Depreciable life range for majority of aircraft costs |  | 15 to 30 years |  |  |
Depreciation expense, excluding gains and losses on sales of property and equipment |  | $ 3,095 | 2,995 | 2,631 |
Interest Costs Capitalized |  | $ 61 | $ 41 | $ 42 |
Number of Idle Aircraft | air-craft |  | 5 |  |  |
Number of months aircraft remained idle |  | an average of 20 months |  |  |
Gain on sale of TNT express business |  | $ 85 |  |  |
Stock Repurchase Program Number Of Shares Authorized To Be Repurchased | shares |  |  |  |  | 25,000,000
Number of Shares Repurchased | shares |  | 4,300,000 | 3,000,000 | 18,200,000 |
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  | $ 237.45 | $ 172.13 | $ 149.35 |
Payments for Repurchase of Common Stock |  | $ 1,017 | $ 509 | $ 2,722 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | shares |  | 12,000,000 |  |  |
Dividends Payable, Date Declared |  | Jun. 11, 2018 |  |  |
Dividends Payable Amount Per Share | $ / shares |  | $ 0.65 |  |  |
Dividends Payable, Date To Be Paid |  | Jul. 09, 2018 |  |  |
Dividends Payable, Date Of Record |  | Jun. 25, 2018 |  |  |
Minimum [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Intangible assets amortization periods |  | 3 years |  |  |
Maximum [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Intangible assets amortization periods |  | 15 years |  |  |
FedEx Express Segment [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Depreciation expense, excluding gains and losses on sales of property and equipment |  | $ 1,679 | $ 1,662 | $ 1,377 |
FedEx Express Segment [Member] | TNT Express Business [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |
Gain on sale of TNT express business | $ 85 |  |  |  |

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