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DESCRIPTION OF BUSINESS SEGMENTS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ / shares in Units, shares in Millions |  | 1 Months Ended | 2 Months Ended | 12 Months Ended | 32 Months Ended |  |  |
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Jun. 09, 2025 $ / shares | Jun. 30, 2024 USD ($) employee | Jul. 21, 2025 USD ($) | May 31, 2025 USD ($) aircraft bank location $ / shares shares | May 31, 2024 USD ($) aircraft $ / shares shares | May 31, 2023 USD ($) aircraft $ / shares shares | May 31, 2023 USD ($) employee | Jun. 01, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2021 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Gross contract assets related to in-transit shipments |  |  |  | $ 673,000,000 | $ 672,000,000 |  |  |  |  |
Contract assets net of deferred unearned revenue |  |  |  | 526,000,000 | 463,000,000 |  |  |  |  |
Contract liabilities related to advance payments from customers |  |  |  | 23,000,000 | 23,000,000 |  |  |  |  |
Advertising and promotion expenses |  |  |  | 425,000,000 | 421,000,000 | $ 435,000,000 |  |  |  |
Depreciation and amortization |  |  |  | 4,264,000,000 | 4,287,000,000 | 4,176,000,000 |  |  |  |
Capitalized interest |  |  |  | $ 55,000,000 | 81,000,000 | 77,000,000 |  |  |  |
Number of aircraft to be permanently retired from service | aircraft |  |  |  | 12 |  |  |  |  |  |
Number of aircraft engines to be permanently retired from service | aircraft |  |  |  | 8 |  |  |  |  |  |
Noncash impairment charges |  |  |  | $ 21,000,000 | 157,000,000 | 70,000,000 |  |  |  |
Noncash impairment charges net of tax |  |  |  | $ 16,000,000 | $ 120,000,000 | $ 54,000,000 |  |  |  |
Noncash impairment charges net of tax per diluted share (in dollars per share) | $ / shares |  |  |  | $ 0.06 | $ 0.48 | $ 0.21 |  |  |  |
Number of idle aircraft | aircraft |  |  |  | 22 |  |  |  |  |  |
Expected revenue service |  |  |  | 10 months |  |  |  |  |  |
Purchase of treasury stock (in shares) | shares |  |  |  | 10.9 | 9.8 | 9.2 |  |  |  |
Payments for repurchase of common stock |  |  |  | $ 3,017,000,000 | $ 2,500,000,000 | $ 1,500,000,000 |  |  |  |
Cash dividends declared (in dollars per share) | $ / shares |  |  |  | $ 5.52 | $ 3.78 | $ 5.86 |  |  |  |
Number of employees left or voluntarily leaving | employee |  | 1,400 |  |  |  |  | 5,000 |  |  |
Consultation process expected occur period |  | 18 months |  |  |  |  |  |  |  |
Expected cash expenditures |  | $ 150,000,000 |  |  |  |  |  |  |  |
Business optimization costs |  |  |  | $ 756,000,000 | $ 582,000,000 | $ 273,000,000 |  |  |  |
Business optimization costs, net of tax |  |  |  | $ 577,000,000 | $ 444,000,000 | $ 209,000,000 |  |  |  |
Business optimization costs (in dollar per share) | $ / shares |  |  |  | $ 2.37 | $ 1.77 | $ 0.81 |  |  |  |
Cost incurred to date |  |  |  | $ 235,000,000 |  |  |  |  |  |
Aggregate pre-tax cost of business optimization |  |  |  | 1,600,000,000 |  |  |  |  |  |
Business realignment costs |  |  |  | 0 | $ 0 | $ 36,000,000 | $ 430,000,000 |  |  |
Business realignment costs, net of tax |  |  |  |  |  | $ 27,000,000 |  |  |  |
Business realignment costs per diluted share | $ / shares |  |  |  |  |  | $ 0.11 |  |  |  |
Business employee severance costs paid |  |  |  |  |  | $ 118,000,000 |  |  |  |
Freight spin off costs |  |  |  | 56,000,000 |  |  |  |  |  |
Freight spin off costs, net of tax |  |  |  | $ 44,000,000 |  |  |  |  |  |
Freight spin off costs (in dollar per share) | $ / shares |  |  |  | $ 0.18 |  |  |  |  |  |
Professional fees |  |  |  | $ 38,000,000 |  |  |  |  |  |
Debt issuance costs |  |  |  | $ 18,000,000 |  |  |  |  |  |
Network 2.0 Optimization |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Number of business locations | location |  |  |  | 290 |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends declared (in dollars per share) | $ / shares | $ 1.45 |  |  |  |  |  |  |  |  |
2022 Repurchase Program |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized to be repurchased |  |  |  |  |  |  |  |  |  | $ 5,000,000,000.0
Purchase of treasury stock (in shares) | shares |  |  |  |  |  | 9.2 |  |  |  |
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares |  |  |  |  |  | $ 163.39 |  |  |  |
Payments for repurchase of common stock |  |  |  |  |  | $ 1,500,000,000 |  |  |  |
2024 Repurchase Program |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized to be repurchased |  |  |  |  |  |  |  |  | $ 5,000,000,000.0 |
Purchase of treasury stock (in shares) | shares |  |  |  |  | 9.8 |  |  |  |  |
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares |  |  |  |  | $ 255.34 |  |  |  |  |
Payments for repurchase of common stock |  |  |  |  | $ 2,500,000,000 |  |  |  |  |
2024 Repurchase Program | Subsequent Event |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized to be repurchased, remaining available amount |  |  | $ 1,600,000,000 |  |  |  |  |  |  |
Payments for repurchase of common stock |  |  | $ 500,000,000 |  |  |  |  |  |  |
2021 And 2024 Stock Repurchase Program |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount authorized to be repurchased, remaining available amount |  |  |  |  |  |  |  | $ 5,100,000,000 |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) | shares |  |  |  | 10.9 |  |  |  |  |  |
Number of banks | bank |  |  |  | 2 |  |  |  |  |  |
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares |  |  |  | $ 274.34 |  |  |  |  |  |
Payments for repurchase of common stock |  |  |  | $ 3,000,000,000.0 |  |  |  |  |  |
Share repurchases benefit per diluted share (in dollars per share) | $ / shares |  |  |  | $ 0.44 |  |  |  |  |  |
Supply Chain Finance |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding payment obligations |  |  |  | $ 71,000,000 | $ 94,000,000 | $ 83,000,000 | $ 83,000,000 |  |  |
Boeing 757-200 aircraft |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Number of aircraft to be permanently retired from service | aircraft |  |  |  | 2 | 22 | 4 |  |  |  |
Number of aircraft engines to be permanently retired from service | aircraft |  |  |  |  | 7 | 1 |  |  |  |
Airbus A300-600 aircraft |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Number of aircraft to be permanently retired from service | aircraft |  |  |  | 7 |  | 2 |  |  |  |
Number of aircraft engines to be permanently retired from service | aircraft |  |  |  |  |  | 8 |  |  |  |
Boeing MD-11F aircraft |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Number of aircraft to be permanently retired from service | aircraft |  |  |  | 3 |  | 12 |  |  |  |
Number of aircraft engines to be permanently retired from service | aircraft |  |  |  |  |  | 25 |  |  |  |
Decrease in depreciation |  |  |  | $ 19,000,000 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets amortization periods |  |  |  | 1 year |  |  |  |  |  |
Expected cash expenditures |  |  |  | $ 250,000,000 |  |  |  |  |  |
Minimum | Wide-body aircraft and related equipment |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Depreciable lives range |  |  |  | 18 years |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets amortization periods |  |  |  | 15 years |  |  |  |  |  |
Expected cash expenditures |  |  |  | $ 275,000,000 |  |  |  |  |  |
Maximum | Wide-body aircraft and related equipment |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Depreciable lives range |  |  |  | 30 years |  |  |  |  |  |
Payment Interval One |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Contract with customer, periodic payment term |  |  |  | 15 days |  |  |  |  |  |
Payment Interval Two |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Contract with customer, periodic payment term |  |  |  | 30 days |  |  |  |  |  |
Payment Interval Three |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Contract with customer, periodic payment term |  |  |  | 45 days |  |  |  |  |  |
Payment Interval Four |  |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |
Contract with customer, periodic payment term |  |  |  | 90 days |  |  |  |  |  |

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