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Description of Business Segments and Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, € in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 16, 2021 USD ($) | Jan. 31, 2021 Employee | May 31, 2023 USD ($) | May 31, 2021 USD ($) air-craft $ / shares shares | May 31, 2020 USD ($) air-craft $ / shares shares | May 31, 2019 USD ($) Employee $ / shares shares | May 31, 2021 EUR (€) air-craft shares | Jan. 26, 2016 shares
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Gross contract assets related to in-transit shipments |  |  |  | $ 715,000,000 | $ 563,000,000 |  |  |
Contract assets net of deferred unearned revenue |  |  |  | 572,000,000 | 456,000,000 |  |  |
Contract liabilities related to advance payments from customers |  |  |  | $ 9,000,000 | 10,000,000 |  |  |
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 |  |  |  | $ 428,000,000 | 427,000,000 | $ 468,000,000 |  |
Depreciable life range for majority of aircraft costs |  |  |  | 15 to 30 years |  |  |  |
Depreciation expense, excluding gains and losses on sales of property and equipment |  |  |  | $ 3,793,000,000 | 3,615,000,000 | 3,353,000,000 |  |
Interest costs capitalized |  |  |  | $ 68,000,000 | $ 54,000,000 | $ 64,000,000 |  |
Number of aircraft to be permanently retired from service | air-craft |  |  |  |  | 10 |  |  |
Number of aircraft engines to be permanently retired from service | air-craft |  |  |  |  | 12 |  |  |
Noncash impairment charges |  |  |  |  | $ 66,000,000 |  |  |
Noncash impairment charges net of tax |  |  |  |  | $ 50,000,000 |  |  |
Noncash impairment charges net of tax per diluted share | $ / shares |  |  |  |  | $ 0.19 |  |  |
Number of Idle Aircraft | air-craft |  |  |  | 9 |  |  | 9 |
Number of months aircraft remained idle |  |  |  | an average of 17 months |  |  |  |
Denominated debt as a net investment hedge | € |  |  |  |  |  |  | € 210 |
Stock repurchase program number of shares authorized to be repurchased | shares |  |  |  |  |  |  |  | 25,000,000
Stock repurchase program, remaining number of shares authorized to be repurchased | shares |  |  |  | 5,100,000 |  |  | 5,100,000 |
Number of shares repurchased | shares |  |  |  |  | 20,000.00 | 6,600,000 |  |
Treasury stock acquired, average cost per share | $ / shares |  |  |  |  | $ 156.90 | $ 222.94 |  |
Payments for repurchase of common stock |  |  |  |  | $ 3,000,000 | $ 1,480,000,000 |  |
Dividends payable, date declared |  |  |  | Jun. 14, 2021 |  |  |  |
Dividends payable amount per share | $ / shares |  |  |  | $ 0.75 |  |  |  |
Dividends payable, date to be paid |  |  |  | Jul. 12, 2021 |  |  |  |
Dividends payable, date of record |  |  |  | Jun. 28, 2021 |  |  |  |
Number of employees left or voluntarily leaving | Employee |  |  |  |  |  | 1,500 |  |
Business realignment costs |  |  |  | $ 116,000,000 |  | $ 320,000,000 |  |
Diluted | $ / shares |  |  |  | $ 19.45 | $ 4.90 | $ 2.03 |  |
Restructuring plan execution period |  | 18 months |  |  |  |  |  |
Business realignment costs, net of tax |  |  |  | $ 90,000,000 |  |  |  |
Business realignment costs per diluted share | $ / shares |  |  |  | $ 0.33 |  |  |  |
Business employee severance costs paid |  |  |  | $ 15,000,000 |  |  |  |
Business Realignment Activities [Member] |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Business realignment costs |  |  |  |  |  | $ 320,000,000 |  |
Costs associated with funding to healthcare reimbursement accounts |  |  |  |  |  | 50,000,000 |  |
Business Realignment Activities [Member] | Severance Payments [Member] |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Payment of severance cost at departure |  |  |  |  | $ 50,000,000 | $ 220,000,000 |  |
Amended and Restated Five-Year Credit Agreement [Member] |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Line Of Credit Facility Maximum Borrowing Capacity | $ 2,000,000,000.0 |  |  |  |  |  |  |
Amended and Restated 364-Day Credit Agreement [Member] |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Line Of Credit Facility Maximum Borrowing Capacity | $ 1,500,000,000 |  |  |  |  |  |  |
Line of Credit Facility, Term | 364 days |  |  |  |  |  |  |
Amendments to Credit Agreements [Member] |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Dividends payable amount per share | $ / shares |  |  |  |  | $ 0.65 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Intangible assets amortization periods |  |  |  | 1 year |  |  |  |
Number of employees left or voluntarily leaving | Employee |  | 5,500 |  |  |  |  |  |
Minimum [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Business realignment costs |  |  | $ 300,000,000 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Intangible assets amortization periods |  |  |  | 15 years |  |  |  |
Number of employees left or voluntarily leaving | Employee |  | 6,300 |  |  |  |  |  |
Maximum [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |
Business realignment costs |  |  | $ 575,000,000 |  |  |  |  |

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