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Financing Arrangements - Additional Information (Details) | 3 Months Ended |
--- | --- | ---
Aug. 31, 2021 USD ($) air-craft | May 31, 2021 USD ($)
Line Of Credit Facility [Line Items] |  |
Number of Boeing aircraft | air-craft | 19 |
Net book value of Boeing aircraft | $ 1,800,000,000 |
Letter of credit maximum sublimit amount | $ 250,000,000 |
Financial covenant terms ratio | 350.00% |
Financial covenant compliance ratio | 198.00% |
Long term debt, including current maturities and exclusive of finance leases carrying value | $ 20,200,000,000 | $ 20,700,000,000
Long term debt, including current maturities and exclusive of finance leases fair value | $ 23,800,000,000 | $ 23,100,000,000
Long-term debt weighted-average interest rate | 3.50% |
Five-Year Credit Agreement [Member] |  |
Line Of Credit Facility [Line Items] |  |
Line of credit facility, term | 5 years |
Line of credit facility maximum borrowing capacity | $ 2,000,000,000.0 |
Line of credit facility, expiration date | 2026-03 |
Letter of credit outstanding sublimit unused amount | $ 250,000,000 |
364-Day Credit Agreement [Member] |  |
Line Of Credit Facility [Line Items] |  |
Line of credit facility, term | 364 days |
Line of credit facility maximum borrowing capacity | $ 1,500,000,000 |
Line of credit facility, expiration date | 2022-03 |
Credit Agreement |  |
Line Of Credit Facility [Line Items] |  |
Commercial paper outstanding | $ 0 |
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 |

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