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Long-term Debt and Other Financing Arrangements - Additional Information (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 16, 2021 USD ($) | Aug. 31, 2020 USD ($) | May 31, 2021 USD ($) air-craft | May 31, 2021 EUR (€) | May 31, 2021 USD ($) air-craft | May 31, 2021 EUR (€) air-craft | Mar. 15, 2021 | May 31, 2020 USD ($)
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Long-term debt weighted-average interest rate |  |  | 3.40% |  | 3.40% | 3.40% |  |
Long term debt, including current maturities and exclusive of finance leases fair value |  |  | $ 23,100,000,000 |  | $ 23,100,000,000 |  |  | $ 22,800,000,000
Number of Boeing aircraft | air-craft |  |  | 19 |  | 19 | 19 |  |
Net book value of Boeing aircraft |  |  | $ 1,900,000,000 |  | $ 1,900,000,000 |  |  |
Letter of credit maximum sublimit amount | $ 250,000,000 |  |  |  |  |  |  |
Financial Covenant Terms Ratio | 350.00% |  |  |  |  |  | 375.00% |
Financial covenant compliance ratio |  |  | 197.00% |  | 197.00% | 197.00% |  |
Loss on debt extinguishment |  |  |  |  | $ 393,000,000 |  |  |
Senior Unsecured Debt [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 3,250,000,000 |  | 3,250,000,000 |  |  |
Five-Year Credit Agreement [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line Of Credit Facility Maximum Borrowing Capacity | $ 2,000,000,000.0 |  |  |  |  |  |  |
Line of Credit Facility, Term | 5 years |  |  |  |  |  |  |
Line of credit facility, expiration date | 2026-03 |  |  |  |  |  |  |
Letter of credit outstanding sublimit unused amount |  |  | 250,000,000 |  | 250,000,000 |  |  |
Credit Agreements [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Commercial paper outstanding |  |  | $ 0 |  | $ 0 |  |  |
364-Day Credit Agreement [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line Of Credit Facility Maximum Borrowing Capacity | $ 1,500,000,000 |  |  |  |  |  |  |
Line of Credit Facility, Term | 364 days |  |  |  |  |  |  |
Line of credit facility, expiration date | 2022-03 |  |  |  |  |  |  |
1.875% due in February 2034 [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 970,000,000 |  |  |  |  |  |
Fixed interest rate |  | 1.875% |  |  |  |  |  |
Debt instrument, maturity date |  | 2034-02 |  |  |  |  |  |
0.45% Fixed-rate Notes Due in May 2029 [Member] | Senior Unsecured Debt [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  | € 600,000,000 |  |
Fixed interest rate |  |  | 0.45% |  | 0.45% | 0.45% |  |
Debt instrument, maturity date |  |  | 2029-05 | 2029-05 |  |  |  |
0.95% Fixed-rate Notes Due in May 2033 [Member] | Senior Unsecured Debt [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  | € 650,000,000 |  |
Fixed interest rate |  |  | 0.95% |  | 0.95% | 0.95% |  |
Debt instrument, maturity date |  |  | 2033-05 | 2033-05 |  |  |  |
2.40% Fixed-rate Notes Due in May 2031 [Member] | Senior Unsecured Debt [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 1,000,000,000.0 |  | $ 1,000,000,000.0 |  |  |
Fixed interest rate |  |  | 2.40% |  | 2.40% | 2.40% |  |
Debt instrument, maturity date |  |  | 2031-05 | 2031-05 |  |  |  |
3.25% Fixed-rate Notes Due in May 2041 [Member] | Senior Unsecured Debt [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 750,000,000 |  | $ 750,000,000 |  |  |
Fixed interest rate |  |  | 3.25% |  | 3.25% | 3.25% |  |
Debt instrument, maturity date |  |  | 2041-05 | 2041-05 |  |  |  |
3.40% Notes Due 2022 [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 3.40% |  | 3.40% | 3.40% |  |
Repayments of notes |  |  | $ 500,000,000 |  |  |  |  |
Debt instrument maturity, year |  |  | 2022 | 2022 |  |  |  |
0.70% Notes Due 2022 [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 0.70% |  | 0.70% | 0.70% |  |
Repayments of notes | € |  |  |  | € 640,000,000 |  |  |  |
Debt instrument maturity, year |  |  | 2022 | 2022 |  |  |  |
2.625% Notes Due 2023 [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 2.625% |  | 2.625% | 2.625% |  |
Repayments of notes |  |  | $ 500,000,000 |  |  |  |  |
Debt instrument maturity, year |  |  | 2023 | 2023 |  |  |  |
1.00% Notes Due 2023 [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 1.00% |  | 1.00% | 1.00% |  |
Repayments of notes | € |  |  |  | € 750,000,000 |  |  |  |
Debt instrument maturity, year |  |  | 2023 | 2023 |  |  |  |
2.70% Notes Due 2023 [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 2.70% |  | 2.70% | 2.70% |  |
Repayments of notes |  |  | $ 250,000,000 |  |  |  |  |
Debt instrument maturity, year |  |  | 2023 | 2023 |  |  |  |
4.00% Notes Due 2024 [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 4.00% |  | 4.00% | 4.00% |  |
Repayments of notes |  |  | $ 750,000,000 |  |  |  |  |
Debt instrument maturity, year |  |  | 2024 | 2024 |  |  |  |
3.20% Notes Due 2025 [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 3.20% |  | 3.20% | 3.20% |  |
Repayments of notes |  |  | $ 700,000,000 |  |  |  |  |
Debt instrument maturity, year |  |  | 2025 | 2025 |  |  |  |
3.80% Notes Due 2025 [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 3.80% |  | 3.80% | 3.80% |  |
Repayments of notes |  |  | $ 1,000,000,000.0 |  |  |  |  |
Debt instrument maturity, year |  |  | 2025 | 2025 |  |  |  |
3.30% Notes Due 2027 [Member] |  |  |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 3.30% |  | 3.30% | 3.30% |  |
Repayments of notes |  |  | $ 450,000,000 |  |  |  |  |
Debt instrument maturity, year |  |  | 2027 | 2027 |  |  |  |

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