Business Segments and Disaggregated Revenue - Schedule of Segment Information (Parenthetical) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
May 31, 2021 |
May 31, 2020 |
May 31, 2019 |
|
| Segment Reporting Information [Line Items] | |||
| Integration expenses | $ 210 | $ 270 | $ 388 |
| Business realignment costs | 116 | 320 | |
| Goodwill and other asset impairment charges | 435 | ||
| FedEx Express Segment [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Business realignment costs | $ 116 | ||
| FedEx Office and FedEx Express [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Goodwill and other asset impairment charges | $ 435 | ||
| FedEx Ground Segment [Member] | |||
| Segment Reporting Information [Line Items] | |||
| Ground independent contractor legal expense | $ 46 | ||