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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2017 USD ($) air-craft $ / shares shares | May 31, 2016 USD ($) $ / shares shares | May 31, 2015 USD ($) air-craft Engine $ / shares shares | Jan. 26, 2016 shares
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |
Advertising and promotion expenses | $ 458 | $ 417 | $ 403 |
Depreciable life range for majority of aircraft costs | 15 to 30 years |  |  |
Number of aircraft with shortened depreciable lives | air-craft |  |  | 23 |
Number of aircraft engines with shortened depreciable lives | Engine |  |  | 57 |
Depreciation expense, excluding gains and losses on sales of property and equipment | $ 2,900 | 2,600 | $ 2,600 |
Interest Costs Capitalized | $ 41 | $ 42 | $ 37 |
Number of Idle Aircraft | air-craft | 7 |  |  |
Number of months aircraft remained idle | an average of 12 months |  |  |
Number of Impaired Boeing MD11 Aircraft | air-craft |  |  | 7 |
Number of Impaired Boeing MD11 Aircraft Engines | Engine |  |  | 12 |
Number of Impaired Airbus A310-300 Aircraft | air-craft |  |  | 4 |
Number of Impaired Airbus A310-300 Aircraft Engines | Engine |  |  | 3 |
Number of Impaired Airbus A300-600 Aircraft | air-craft |  |  | 3 |
Number of Impaired Airbus A300-600 Aircraft Engines | Engine |  |  | 3 |
Number of Impaired Boeing MD10-10 Aircraft | air-craft |  |  | 1 |
Number of Impaired Boeing MD10-10 Aircraft Engines | Engine |  |  | 3 |
Asset impairments |  |  | $ 276 |
Asset impairments, net of tax |  |  | $ 175 |
Asset impairments Diluted EPS impact | $ / shares |  |  | $ 0.61 |
Asset impairment non-cash |  |  | $ 246 |
Stock Repurchase Program, Number Of Shares Authorized To Be Repurchased | shares |  |  |  | 25,000,000
Purchase of treasury stock | shares | 3,000,000 | 18,200,000 | 8,100,000 |
Treasury Stock Acquired, Average Cost Per Share | $ / shares | $ 172.13 | $ 149.35 | $ 154.03 |
Payments for Repurchase of Common Stock | $ 509 | $ 2,722 | $ 1,254 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | shares | 16,000,000 |  |  |
Dividends Payable, Date Declared | Jun. 12, 2017 |  |  |
Dividends Payable Amount Per Share | $ / shares | $ 0.50 |  |  |
Dividends Payable, Date To Be Paid | Jul. 06, 2017 |  |  |
Dividends Payable, Date Of Record | Jun. 22, 2017 |  |  |
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 |  |  |

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