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Description of Business Segments and Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, € in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 29 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 14, 2022 $ / shares | Jan. 31, 2021 Employee | Feb. 28, 2022 shares | May 31, 2022 USD ($) AirCraft $ / shares shares | May 31, 2021 USD ($) $ / shares | May 31, 2020 USD ($) AirCraft $ / shares shares | May 31, 2023 USD ($) | May 31, 2022 EUR (€) AirCraft shares | Dec. 16, 2021 USD ($) | Dec. 08, 2021 USD ($) | Jan. 26, 2016 shares
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross contract assets related to in-transit shipments |  |  |  | $ 861 | $ 715 |  |  |  |  |  |
Contract assets net of deferred unearned revenue |  |  |  | 623 | 572 |  |  |  |  |  |
Contract liabilities related to advance payments from customers |  |  |  | $ 8 | 9 |  |  |  |  |  |
Payment terms of customer contracts |  |  |  | Under the typical payment terms of our customer contracts, the customer pays at periodic intervals (e.g., every 15 days, 30 days, 45 days, etc.) for shipments included on invoices received. It is not customary business practice to extend payment terms past 90 days, and as such, we do not have a practice of including a significant financing component within our revenue contracts with customers. |  |  |  |  |  |  |
Advertising and promotion expenses |  |  |  | $ 470 | 428 | $ 427 |  |  |  |  |
Depreciable life range for majority of aircraft costs |  |  |  | 15 to 30 years |  |  |  |  |  |  |
Depreciation expense, excluding gains and losses on sales of property and equipment |  |  |  | $ 3,970 | 3,793 | 3,615 |  |  |  |  |
Interest costs capitalized |  |  |  | $ 62 | 68 | $ 54 |  |  |  |  |
Number of aircraft to be permanently retired from service | AirCraft |  |  |  |  |  | 10 |  |  |  |  |
Number of aircraft engines to be permanently retired from service | AirCraft |  |  |  |  |  | 12 |  |  |  |  |
Noncash impairment charges |  |  |  |  |  | $ 66 |  |  |  |  |
Noncash impairment charges net of tax |  |  |  |  |  | $ 50 |  |  |  |  |
Noncash impairment charges net of tax per diluted share | $ / shares |  |  |  |  |  | $ 0.19 |  |  |  |  |
Number of Idle Aircraft | AirCraft |  |  |  | 8 |  |  |  | 8 |  |  |
Number of months aircraft remained idle |  |  |  | an average of 24 months |  |  |  |  |  |  |
Denominated debt as a net investment hedge | € |  |  |  |  |  |  |  | € 107 |  |  |
Number of shares repurchased | shares |  |  |  | 8,900,000 |  | 20,000.00 |  |  |  |  |
Treasury stock acquired, average cost per share | $ / shares |  |  |  | $ 253.85 |  | $ 156.90 |  |  |  |  |
Payments for repurchase of common stock |  |  |  | $ 2,248 |  | $ 3 |  |  |  |  |
Business realignment costs |  |  |  | $ 278 | 116 |  |  |  |  |  |
Number of employees left or voluntarily leaving | Employee |  | 5,000 |  |  |  |  |  |  |  |  |
Restructuring plan execution period |  |  |  | 2023 |  |  |  |  |  |  |
Business realignment costs, net of tax |  |  |  | $ 214 | $ 90 |  |  |  |  |  |
Business realignment costs per diluted share | $ / shares |  |  |  | $ 0.80 | $ 0.33 |  |  |  |  |  |
Business employee severance costs paid |  |  |  | $ 225 | $ 15 |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cash dividend payable amount per share | $ / shares | $ 1.15 |  |  |  |  |  |  |  |  |  |
Cash dividend payable, date declared | Jun. 14, 2022 |  |  |  |  |  |  |  |  |  |
Cash dividend payable, date of record | Jun. 27, 2022 |  |  |  |  |  |  |  |  |  |
Cash dividend payable, date to be paid | Jul. 11, 2022 |  |  |  |  |  |  |  |  |  |
Equity and Commercial Agreements | Delhivery |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity investment |  |  |  |  |  |  |  |  |  | $ 100 |
2016 Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program number of shares authorized to be repurchased | shares |  |  |  |  |  |  |  |  |  |  | 25,000,000
Stock repurchase program, remaining number of shares authorized to be available for repurchase | shares |  |  |  | 0 |  |  |  | 0 |  |  |
2022 Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized to be repurchased, remaining available amount |  |  |  | $ 4,100 |  |  |  |  |  |  |
Stock repurchase program amount authorized to be repurchased |  |  |  |  |  |  |  |  | $ 5,000 |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized to be repurchased |  |  |  |  |  |  |  |  | $ 1,500 |  |
Number of shares repurchased | shares |  |  | 6,100,000 |  |  |  |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business realignment costs |  |  |  |  |  |  | $ 420 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets amortization periods |  |  |  | 1 year |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets amortization periods |  |  |  | 15 years |  |  |  |  |  |  |

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