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Description of Business and Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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May. 31, 2015 USD ($) $ / shares shares | Feb. 28, 2015 USD ($) $ / shares | Nov. 30, 2014 USD ($) $ / shares | Aug. 31, 2014 USD ($) $ / shares | May. 31, 2014 USD ($) $ / shares | Feb. 28, 2014 USD ($) $ / shares | Nov. 30, 2013 USD ($) $ / shares | Aug. 31, 2013 USD ($) $ / shares | May. 31, 2015 USD ($) $ / shares shares | May. 31, 2014 USD ($) $ / shares shares | May. 31, 2013 USD ($) $ / shares shares | May. 31, 2012 USD ($)
Advertising [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising and promotion expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 403 | $ 407 | $ 424 |
Business Realignment Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Realignment Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 560 |
Business Realignment Costs, Net Of Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 353 |
Business Realignment Costs, Diluted EPS Impact | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.11 |
Business Realignment Costs Paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300 | $ 180 |
Number of Employees Accepted Voluntary Buyout |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,600 |  |
Percent Employees Departed May 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |
Percent Employees Departed Throughout 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |
Percent Employees Departed on May 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |
Capitalized Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Costs Capitalized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37 | $ 29 | $ 45 |
Dividends Declared [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 08, 2015 |  |  |
Dividends Payable Amount Per Share | $ / shares | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.25 |  |  |
Dividends Payable, Date Paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 02, 2015 |  |  |
Dividends Payable, Date Of Record |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 18, 2015 |  |  |
Impairment of Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairments Diluted EPS impact | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.61 |  | $ 0.20 |
Asset impairments, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175 |  | $ 63 |
Number of Impaired Airbus A310-200 Aircraft |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Number of Impaired Airbus A310-300 Aircraft | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  | 3 |
Number of Impaired Airbus A300-600 Aircraft | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Number of Impaired Boeing MD10-10 Aircraft | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 5 |
Number of Impaired Boeing MD11 Aircraft | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |
Number of Impaired Airbus A300-600 Aircraft Engines | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Number of Impaired Boeing MD10-10 Aircraft Engines | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 15 |
Number of Impaired Boeing MD11 Aircraft Engines | 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 |  |  |
Number of Impaired Airbus 310-200 Aircraft Engines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |
Number of Impaired Airbus A310-300 Aircraft Engines | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 2 |
Number of Idle Aircraft | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Aircraft Idle Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 months |  |  |
Asset impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 276 |  |  |
Asset impairment non-cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 246 |  | $ 100 |
Pension And Postretirement Healthcare Plans Equity Impact [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MTM Accounting Cumulative Effect on Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,900
OPERATING EXPENSES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,110 | 16,171 | 16,055 |
Retirement plans mark-to-market adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,190 | 15 | (1,368) |
Operating income | $ (1,321) | [1] | $ 1,038 | [1] | $ 1,088 | [1] | $ 1,062 | [1] | $ 1,264 | [1] | $ 737 | [1] | $ 923 | [1] | $ 891 | [1] | 1,867 | 3,815 | 4,434 |
Income Before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,627 | 3,658 | 4,338 |
Provision for Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 577 | 1,334 | 1,622 |
Net income | $ (895) | [1] | $ 628 | [1] | $ 663 | [1] | $ 653 | [1] | $ 780 | [1] | $ 437 | [1] | $ 559 | [1] | $ 548 | [1] | $ 1,050 | $ 2,324 | $ 2,716 |
Basic earnings per common share | $ / shares | $ (3.16) | [2] | $ 2.21 | [2] | $ 2.34 | [2] | $ 2.29 | [2] | $ 2.66 | [2] | $ 1.44 | [2] | $ 1.77 | [2] | $ 1.73 | [2] | $ 3.70 | $ 7.56 | $ 8.61 |
Diluted earnings per common share | $ / shares | $ (3.16) | [2] | $ 2.18 | [2] | $ 2.31 | [2] | $ 2.26 | [2] | $ 2.62 | [2] | $ 1.42 | [2] | $ 1.75 | [2] | $ 1.72 | [2] | $ 3.65 | $ 7.48 | $ 8.55 |
Consolidated Statements of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ (895) | [1] | $ 628 | [1] | $ 663 | [1] | $ 653 | [1] | $ 780 | [1] | $ 437 | [1] | $ 559 | [1] | $ 548 | [1] | $ 1,050 | $ 2,324 | $ 2,716 |
Amortization of prior service credit and other, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 76 | 63 |
CONSOLIDATED BALANCE SHEETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 16,900 |  |  |  |  |  |  |  | 16,229 |  |  |  |  |  |  |  | 16,900 | 16,229 |  |
Accumulated other comprehensive income | 172 |  |  |  |  |  |  |  | 506 |  |  |  |  |  |  |  | 172 | 506 | 607 |
Operating Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | (895) | [1] | $ 628 | [1] | $ 663 | [1] | $ 653 | [1] | 780 | [1] | $ 437 | [1] | $ 559 | [1] | $ 548 | [1] | 1,050 | 2,324 | 2,716 |
Deferred income taxes and other noncash items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (572) | 339 | 734 |
Retirement plans MTM adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,190 | 15 | (1,368) |
Property And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net property and equipment | $ 20,875 |  |  |  |  |  |  |  | 19,550 |  |  |  |  |  |  |  | 20,875 | 19,550 |  |
Depreciation expense, excluding gains and losses on sales of property and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,600 | 2,600 | $ 2,300 |
Depreciable Life Range For Majority Of Aircraft Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 to 30 |  |  |
Number of Aircraft With Shortened Depreciable Lives | 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23 |  | 76 | 54
Number of Aircraft Engines With Shortened Depreciable Lives | 57 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 57 |  |  |
Incremental Depreciation Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74 | $ 69 |
Balance Sheet reclassification of vehicles |  |  |  |  |  |  |  |  | 1,100 |  |  |  |  |  |  |  |  | 1,100 |  |
Balance Sheet reclassification of facilities and other |  |  |  |  |  |  |  |  | 72 |  |  |  |  |  |  |  |  | $ 72 |  |
Treasury Shares [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 154.03 | $ 131.83 |  |
Purchase of treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,254 | $ 4,857 | $ 246 |
Stock Repurchase Program, Number Of Shares Authorized To Be Repurchased | shares | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | shares | 12,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,200,000 |  |  |
Treasury Stock Shares Acquired | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,100,000 | 36,800,000 | 2,700,000 |
Wide Body Aircraft And Related Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciable lives range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 to 30 years |  |  |
Net property and equipment | $ 7,548 |  |  |  |  |  |  |  | 7,223 |  |  |  |  |  |  |  | $ 7,548 | $ 7,223 |  |
Narrow Body And Feeder Aircraft And Related Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciable lives range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 to 18 years |  |  |
Net property and equipment | 2,943 |  |  |  |  |  |  |  | 2,639 |  |  |  |  |  |  |  | $ 2,943 | 2,639 |  |
Package Handling And Ground Support Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciable lives range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 to 30 years |  |  |
Net property and equipment | 2,410 |  |  |  |  |  |  |  | 2,024 |  |  |  |  |  |  |  | $ 2,410 | 2,024 |  |
Vehicles [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciable lives range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 to 15 years |  |  |
Net property and equipment | 2,717 |  |  |  |  |  |  |  | 2,615 |  |  |  |  |  |  |  | $ 2,717 | 2,615 |  |
Computer And Electronic Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciable lives range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 to 10 years |  |  |
Net property and equipment | 866 |  |  |  |  |  |  |  | 923 |  |  |  |  |  |  |  | $ 866 | 923 |  |
Facilities And Other Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciable lives range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 to 40 years |  |  |
Net property and equipment | $ 4,391 |  |  |  |  |  |  |  | 4,126 |  |  |  |  |  |  |  | $ 4,391 | 4,126 |  |
Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,555 | $ 16,570 |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,446 | 2,551 |
Income Before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,289 | 2,455 |
Provision for Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,192 | 894 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,097 | $ 1,561 |
Basic earnings per common share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.82 | $ 4.95 |
Diluted earnings per common share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.75 | $ 4.91 |
Consolidated Statements of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,097 | $ 1,561 |
Amortization of prior service credit and other, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 151 | 1,092 |
CONSOLIDATED BALANCE SHEETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  | 20,429 |  |  |  |  |  |  |  |  | 20,429 | 18,519 |
Accumulated other comprehensive income |  |  |  |  |  |  |  |  | (3,694) |  |  |  |  |  |  |  |  | (3,694) | (3,820) |
Operating Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,097 | 1,561 |
Deferred income taxes and other noncash items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 581 | 521 |
Adjusted [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,171 | 16,055 |
Retirement plans mark-to-market adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 | (1,368) |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,815 | 4,434 |
Income Before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,658 | 4,338 |
Provision for Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,334 | 1,622 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,324 | $ 2,716 |
Basic earnings per common share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.56 | $ 8.61 |
Diluted earnings per common share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.48 | $ 8.55 |
Consolidated Statements of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,324 | $ 2,716 |
Amortization of prior service credit and other, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (76) | (63) |
CONSOLIDATED BALANCE SHEETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  | 16,229 |  |  |  |  |  |  |  |  | 16,229 | 14,092 |
Accumulated other comprehensive income |  |  |  |  |  |  |  |  | 506 |  |  |  |  |  |  |  |  | 506 | 607 |
Operating Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,324 | 2,716 |
Deferred income taxes and other noncash items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 339 | 734 |
Retirement plans MTM adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 | (1,368) |
Effect of Change [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OPERATING EXPENSES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Salaries and employee benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (384) | (515) |
Retirement plans mark-to-market adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 | (1,368) |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 369 | 1,883 |
Income Before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 369 | 1,883 |
Provision for Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 142 | 728 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 227 | $ 1,155 |
Basic earnings per common share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.74 | $ 3.66 |
Diluted earnings per common share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.73 | $ 3.64 |
Consolidated Statements of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 227 | $ 1,155 |
Amortization of prior service credit and other, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (227) | (1,155) |
CONSOLIDATED BALANCE SHEETS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  | (4,200) |  |  |  |  |  |  |  |  | (4,200) | (4,427) |
Accumulated other comprehensive income |  |  |  |  |  |  |  |  | $ 4,200 |  |  |  |  |  |  |  |  | 4,200 | 4,427 |
Operating Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 227 | 1,155 |
Deferred income taxes and other noncash items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (242) | 213 |
Retirement plans MTM adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15 | $ (1,368) |
[1] | The fourth quarter of 2015 includes a $2.2 billion retirement plans mark-to-market loss, $276 million of impairment and related charges resulting from the decision to permanently retire and adjust the retirement schedule of certain aircraft and related engines at FedEx Express and a $197 million reserve increase due to the settlement of a legal matter at FedEx Ground. In addition, the first, second and third quarters of 2015 and all quarters of 2014 have been recast to conform to the current year presentation reflecting the retirement plans accounting changes discussed further in Note 1 and Note 13 and that were included in our June 12, 2015, Form 8-K filing with the Securities and Exchange Commission.
[2] | The sum of the quarterly earnings per share may not equal annual amounts due to differences in the weighted-average number of shares outstanding during the respective periods.

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