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Description of Business Segments and Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, shares in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended | 32 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 10, 2024 $ / shares | Jun. 30, 2024 USD ($) Employee | May 31, 2024 USD ($) AirCraft $ / shares shares | May 31, 2023 USD ($) AirCraft $ / shares shares | May 31, 2022 USD ($) $ / shares shares | May 31, 2023 USD ($) Employee | Jul. 15, 2024 USD ($) | Mar. 31, 2024 USD ($) | Feb. 29, 2024 USD ($) | Dec. 16, 2021 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Gross contract assets related to in-transit shipments |  |  | $ 672 | $ 686 |  | $ 686 |  |  |  |
Contract assets net of deferred unearned revenue |  |  | 463 | 484 |  | 484 |  |  |  |
Contract liabilities related to advance payments from customers |  |  | $ 23 | 19 |  | 19 |  |  |  |
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 |  |  | $ 421 | 435 | $ 470 |  |  |  |  |
Depreciable life range for majority of aircraft costs |  |  | 18 to 30 years |  |  |  |  |  |  |
Depreciation expense, excluding gains and losses on sales of property and equipment |  |  | $ 4,287 | 4,176 | 3,970 |  |  |  |  |
Interest costs capitalized |  |  | 81 | 77 | $ 62 |  |  |  |  |
Noncash impairment charges |  |  | 157 | 70 |  |  |  |  |  |
Noncash impairment charges net of tax |  |  | $ 120 | $ 54 |  |  |  |  |  |
Noncash impairment charges net of tax per diluted share | $ / shares |  |  | $ 0.48 | $ 0.21 |  |  |  |  |  |
Number of Idle Aircraft | AirCraft |  |  | 19 |  |  |  |  |  |  |
Number of months aircraft remained idle |  |  | an average of eight months |  |  |  |  |  |  |
Business optimization costs, net of tax |  |  | $ 444 | $ 209 |  |  |  |  |  |
Business optimization costs per diluted share | $ / shares |  |  | $ 1.77 | $ 0.81 |  |  |  |  |  |
Business optimization costs |  |  | $ 582 | $ 273 |  |  |  |  |  |
Number of shares repurchased | shares |  |  | 9.8 | 9.2 | 8.9 |  |  |  |  |
Payments for repurchase of common stock |  |  | $ 2,500 | $ 1,500 | $ 2,248 |  |  |  |  |
Business realignment costs |  |  | 0 | $ 36 | $ 278 | $ 430 |  |  |  |
Business realignment costs per diluted share | $ / shares |  |  |  | $ 0.11 | $ 0.80 |  |  |  |  |
Number of employees left or voluntarily leaving | Employee |  |  |  |  |  | 5,000 |  |  |  |
Business realignment costs, net of tax |  |  |  | $ 27 | $ 214 |  |  |  |  |
Business employee severance costs paid |  |  |  | 118 | $ 225 |  |  |  |  |
Supply Chain Finance [Member] |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding payment obligations |  |  | $ 94 | $ 83 |  | $ 83 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividend payable amount per share | $ / shares | $ 1.38 |  |  |  |  |  |  |  |  |
Cash dividend payable, date declared | Jun. 10, 2024 |  |  |  |  |  |  |  |  |
Cash dividend payable, date of record | Jun. 24, 2024 |  |  |  |  |  |  |  |  |
Cash dividend payable, date to be paid | Jul. 09, 2024 |  |  |  |  |  |  |  |  |
Consultation process expected occur period |  | 18 months |  |  |  |  |  |  |  |
2022 Repurchase Program |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
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, remaining available amount |  |  |  |  |  |  |  |  | $ 564 |
Stock repurchase program amount authorized to be repurchased |  |  |  |  |  |  |  | $ 5,000 |  |
Treasury stock acquired, average cost per share | $ / shares |  |  | $ 255.34 | $ 163.39 |  |  |  |  |  |
Payments for repurchase of common stock |  |  | $ 2,500 | $ 1,500 |  |  |  |  |  |
Accelerated Share Repurchase Agreement | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
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 |  | $ 1,000 |  |  |  |  |  |  |  |
2024 Repurchase Program |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares repurchased | shares |  |  | 9.8 | 9.2 |  |  |  |  |  |
Boeing MD-11F aircraft [Member] |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Number of aircraft to be permanently retired from service | AirCraft |  |  |  | 12 |  |  |  |  |  |
Number of aircraft engines to be permanently retired from service | AirCraft |  |  |  | 25 |  |  |  |  |  |
Boeing 757-200 aircraft [Member] |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Number of aircraft to be permanently retired from service | AirCraft |  |  | 22 | 4 |  |  |  |  |  |
Number of aircraft engines to be permanently retired from service | AirCraft |  |  | 7 | 1 |  |  |  |  |  |
Airbus A300-600 aircraft [Member] |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Number of aircraft to be permanently retired from service | AirCraft |  |  |  | 2 |  |  |  |  |  |
Number of aircraft engines to be permanently retired from service | AirCraft |  |  |  | 8 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets amortization periods |  |  | 1 year |  |  |  |  |  |  |
Minimum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Expected cash expenditures |  | $ 250 |  |  |  |  |  |  |  |
Number of employees left or voluntarily leaving | Employee |  | 1,700 |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets amortization periods |  |  | 15 years |  |  |  |  |  |  |
Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Expected cash expenditures |  | $ 375 |  |  |  |  |  |  |  |
Number of employees left or voluntarily leaving | Employee |  | 2,000 |  |  |  |  |  |  |  |

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