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DEBT
 3 Months Ended
Mar. 31, 2023
Debt Disclosure [Abstract]  
DEBT
G. DEBT

On April 26, 2022, we entered into a revolving credit agreement (the “2022 Credit Agreement”) with an aggregate commitment of $1.0 billion and a maturity date of April 26, 2027. Under the 2022 Credit Agreement, at our request and subject to certain conditions, we can increase the aggregate commitment up to an additional $500 million with the current lenders or new lenders.
The 2022 Credit Agreement provides for an unsecured revolving credit facility available to us and one of our foreign subsidiaries in U.S. dollars, European euros, British pounds sterling, Canadian dollars and certain other currencies for revolving credit loans, swingline loans and letters of credit. Borrowings under the revolving credit loans denominated in any agreed upon currency other than U.S. dollars are limited to the equivalent of $500 million. We can also borrow swingline loans up to $125 million and obtain letters of credit of up to $25 million. Outstanding letters of credit under the 2022 Credit Agreement reduce our borrowing capacity and we had no outstanding letters of credit under the 2022 Credit Agreement at March 31, 2023.
The 2022 Credit Agreement contains financial covenants requiring us to maintain (A) a net leverage ratio, as adjusted for certain items, not exceeding 4.0 to 1.0, and (B) an interest coverage ratio, as adjusted for certain items, not less than 2.5 to 1.0.
In order for us to borrow under the 2022 Credit Agreement, there must not be any default in our covenants in the 2022 Credit Agreement (i.e., in addition to the two financial covenants described above, principally limitations on subsidiary debt, negative pledge restrictions, and requirements relating to legal compliance, maintenance of our properties and insurance) and our representations and warranties in the 2022 Credit Agreement must be true in all material respects on the date of borrowing (i.e., principally no material adverse change or litigation likely to result in a material adverse change, since December 31, 2021, no material ERISA or environmental non-compliance, and no material tax deficiency). We were in compliance with all covenants and $210 million was borrowed and outstanding at an interest rate of 5.974% at March 31, 2023. 
G. DEBT (Concluded)

On April 26, 2022, we entered into a 364-day $500 million senior unsecured delayed draw term loan due April 26, 2023 with a syndicate of lenders. The senior unsecured term loan and commitments thereunder are subject to prepayment or termination at our option and the loans will bear interest at SOFR plus a spread adjustment and 0.70%. The covenants, including the financial covenants, are substantially the same as those in the 2022 Credit Agreement. We repaid $300 million during 2022.
Subsequent to March 31, 2023, we increased our borrowing under the 2022 Credit Agreement to $266 million at a weighted average interest rate of 6.190%, and repaid the remaining $200 million outstanding under the term loan.
Fair Value of Debt. The fair value of our short-term and long-term fixed-rate debt instruments is based principally upon modeled market prices for the same or similar issues, which are Level 1 inputs. The 364-day term loan has an interest rate that resets monthly and the fair value of this instrument approximates the carrying value at March 31, 2023. The aggregate estimated market value of our short-term and long-term debt at March 31, 2023 was approximately $3.0 billion, compared with the aggregate carrying value of $3.4 billion. The aggregate estimated market value of our short-term and long-term debt at December 31, 2022 was approximately $2.7 billion, compared with the aggregate carrying value of $3.2 billion.