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Summary of Quarterly Operating Results (Unaudited) (Parenthetical) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 31, 2020
Feb. 29, 2020
Nov. 30, 2019
Aug. 31, 2019
May 31, 2019
Feb. 28, 2019
Nov. 30, 2018
Aug. 31, 2018
May 31, 2020
May 31, 2019
May 31, 2018
Selected Quarterly Financial Information [Line Items]                      
Retirement plans mark-to-market adjustment $ 794       $ 3,900       $ 794 $ 3,882 $ (10)
Integration expenses 63 $ 72 $ 64 $ 71 84 $ 69 $ 114 $ 121 270 388 477
Goodwill and other asset impairment charges     66           435   380
Benefit from reduction of valuation allowance on tax loss carryforwards     $ 133     90     133 90  
Deferred income tax expense 51               348 (85) (183)
PROVISION FOR INCOME TAXES (BENEFIT)                 383 115 $ (219)
Business realignment costs         $ 316 4       320  
Income tax benefit from accelerated deductions to be claimed on 2018 tax return             60     (75)  
Increase (Decrease) in Income Taxes             4        
Netherlands [Member]                      
Selected Quarterly Financial Information [Line Items]                      
PROVISION FOR INCOME TAXES (BENEFIT)           $ 50          
CARES Act [Member]                      
Selected Quarterly Financial Information [Line Items]                      
PROVISION FOR INCOME TAXES (BENEFIT) (71)               $ (71)    
FedEx Office and FedEx Logistics Operating Segments [Member]                      
Selected Quarterly Financial Information [Line Items]                      
Goodwill and other asset impairment charges $ 369                    
FedEx Ground Segment [Member]                      
Selected Quarterly Financial Information [Line Items]                      
Settlement of a legal matter             $ 46     $ 46