Financing Arrangements	3 Months Ended
Aug. 31, 2019
Debt And Capital Lease Obligations [Abstract]
Financing Arrangements	(3) Financing Arrangements We have a shelf registration statement filed with the SEC that allows us to sell, in one or more future offerings, any combination of our unsecured debt securities and common stock. During the first quarter of 2020, we issued $2.1 billion of senior unsecured debt under our current shelf registration statement, comprised of $1.0 billion of 3.10% fixed-rate notes due in August 2029, €500 million of 0.45% fixed-rate notes due in August 2025 and €500 million of 1.30% fixed-rate notes due in August 2031. We used the net proceeds to make voluntary contributions to our tax-qualified U.S. domestic pension plans (“U.S. Pension Plans”) during the first quarter of 2020 and to redeem the $400 million aggregate principal amount of 2.30% notes due February 1, 2020 and the €500 million aggregate principal amount of 0.50% notes due April 9, 2020. The remaining net proceeds are being used for general corporate purposes. We have a $2.0 billion five-year credit agreement (the “Five-Year Credit Agreement”) and a $1.5 billion 364-day credit agreement (the “364-Day Credit Agreement” and, together with the Five-Year Credit Agreement, the “Credit Agreements”). The Five-Year Credit Agreement expires in March 2024 and includes a $250 million letter of credit sublimit. The 364-Day Credit Agreement expires in March 2020. The Credit Agreements are available to finance our operations and other cash flow needs. The Credit Agreements contain a financial covenant requiring us to maintain a ratio of debt to consolidated earnings (excluding noncash retirement plans mark-to-market adjustments and noncash asset impairment charges) before interest, taxes, depreciation and amortization (“adjusted EBITDA”) of not more than 3.5 to 1.0, calculated as of the end of the applicable quarter on a rolling four-quarters basis. The ratio of our debt to adjusted EBITDA was 2.41 to 1.0 at August 31, 2019. We believe this covenant is the only significant restrictive covenant in the Credit Agreements. The Credit Agreements contain other customary covenants that do not, individually or in the aggregate, materially restrict the conduct of our business. We are in compliance with the financial covenant and all other covenants in the Credit Agreements and do not expect the covenants to affect our operations, including our liquidity or expected funding needs. If we failed to comply with the financial covenant or any other covenants in the Credit Agreements, our access to financing could become limited. As of August 31, 2019, no commercial paper was outstanding. However, $53 million in letters of credit were outstanding, leaving $3.447 billion available under the Credit Agreements for future borrowings. Long-term debt, including current maturities and exclusive of finance leases, had carrying values of $18.6 billion at August 31, 2019 and $17.5 billion at May 31, 2019, compared with estimated fair values of $20.1 billion at August 31, 2019 and $17.8 billion at May 31, 2019. The annualized weighted-average interest rate on long-term debt was 3.4% at August 31, 2019. The estimated fair values were determined based on quoted market prices and the current rates offered for debt with similar terms and maturities. The fair value of our long-term debt is classified as Level 2 within the fair value hierarchy. This classification is defined as a fair value determined using market-based inputs other than quoted prices that are observable for the liability, either directly or indirectly.

Financing Arrangements

3 Months Ended

Aug. 31, 2019

Debt And Capital Lease Obligations [Abstract]

(3) Financing Arrangements

We have a shelf registration statement filed with the SEC that allows us to sell, in one or more future offerings, any combination of our unsecured debt securities and common stock.

During the first quarter of 2020, we issued $2.1 billion of senior unsecured debt under our current shelf registration statement, comprised of $1.0 billion of 3.10% fixed-rate notes due in August 2029, €500 million of 0.45% fixed-rate notes due in August 2025 and €500 million of 1.30% fixed-rate notes due in August 2031. We used the net proceeds to make voluntary contributions to our tax-qualified U.S. domestic pension plans (“U.S. Pension Plans”) during the first quarter of 2020 and to redeem the $400 million aggregate principal amount of 2.30% notes due February 1, 2020 and the €500 million aggregate principal amount of 0.50% notes due April 9, 2020. The remaining net proceeds are being used for general corporate purposes.

We have a $2.0 billion five-year credit agreement (the “Five-Year Credit Agreement”) and a $1.5 billion 364-day credit agreement (the “364-Day Credit Agreement” and, together with the Five-Year Credit Agreement, the “Credit Agreements”). The Five-Year Credit Agreement expires in March 2024 and includes a $250 million letter of credit sublimit. The 364-Day Credit Agreement expires in March 2020. The Credit Agreements are available to finance our operations and other cash flow needs. The Credit Agreements contain a financial covenant requiring us to maintain a ratio of debt to consolidated earnings (excluding noncash retirement plans mark-to-market adjustments and noncash asset impairment charges) before interest, taxes, depreciation and amortization (“adjusted EBITDA”) of not more than 3.5 to 1.0, calculated as of the end of the applicable quarter on a rolling four-quarters basis. The ratio of our debt to adjusted EBITDA was 2.41 to 1.0 at August 31, 2019. We believe this covenant is the only significant restrictive covenant in the Credit Agreements. The Credit Agreements contain other customary covenants that do not, individually or in the aggregate, materially restrict the conduct of our business. We are in compliance with the financial covenant and all other covenants in the Credit Agreements and do not expect the covenants to affect our operations, including our liquidity or expected funding needs. If we failed to comply with the financial covenant or any other covenants in the Credit Agreements, our access to financing could become limited.

As of August 31, 2019, no commercial paper was outstanding. However, $53 million in letters of credit were outstanding, leaving $3.447 billion available under the Credit Agreements for future borrowings.

Long-term debt, including current maturities and exclusive of finance leases, had carrying values of $18.6 billion at August 31, 2019 and $17.5 billion at May 31, 2019, compared with estimated fair values of $20.1 billion at August 31, 2019 and $17.8 billion at May 31, 2019. The annualized weighted-average interest rate on long-term debt was 3.4% at August 31, 2019. The estimated fair values were determined based on quoted market prices and the current rates offered for debt with similar terms and maturities. The fair value of our long-term debt is classified as Level 2 within the fair value hierarchy. This classification is defined as a fair value determined using market-based inputs other than quoted prices that are observable for the liability, either directly or indirectly.