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Financing Arrangements - Additional Information (Details) | 3 Months Ended |
--- | --- | ---
Aug. 31, 2020 USD ($) air-craft | May 31, 2020 USD ($)
Line Of Credit Facility [Line Items] |  |
Number of Boeing aircraft | air-craft | 19 |
Net book value of Boeing aircraft | $ 1,900,000,000 |
Letter of credit maximum sublimit amount | $ 250,000,000 |
Financial Covenant Terms Ratio | 475.00% |
Financial covenant compliance ratio | 290.00% |
Commercial paper outstanding | $ 0 |
Letters Of Credit Outstanding | 300,000 |
Long term debt, including current maturities and exclusive of finance leases carrying value | 22,800,000,000 | $ 21,500,000,000
Long term debt, including current maturities and exclusive of finance leases fair value | $ 26,000,000,000.0 | $ 22,800,000,000
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 | 2025-03 |
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 | 2021-03 |
Revolving Credit Facility |  |
Line Of Credit Facility [Line Items] |  |
Line of credit facility outstanding for future borrowings | $ 3,500,000,000 |
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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