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Financing Agreements
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Financing Agreements Financing Agreements
Revolving Credit Agreement
We have a senior unsecured revolving credit agreement (the Revolving Credit Agreement), which provides for a revolving credit facility of up to $750 million with a maturity of December 5, 2024. The Revolving Credit Agreement includes a letter of credit sub-limit of $125 million. Borrowings under the Revolving Credit Agreement may be used for working capital, capital expenditures, acquisitions, share repurchases and other general corporate purposes.
Borrowings under the Revolving Credit Agreement may be denominated in U.S. dollars, Canadian dollars, euros and British pounds, and bear interest at a per annum rate equal to, at our option, an applicable eurocurrency rate or base rate plus, in either case, a specified margin. We are required to pay an undrawn commitment fee on the undrawn portion of the commitments under the Revolving Credit Agreement and customary letter of credit fees. The specified margin and the amount of the commitment fee depend on CF Holdings’ credit rating at the time.
As of December 31, 2022, we had unused borrowing capacity under the Revolving Credit Agreement of $750 million and no outstanding letters of credit. There were no borrowings outstanding under the Revolving Credit Agreement as of December 31, 2022 or 2021, or during the years ended December 31, 2022 or 2021. During the year ended December 31, 2020, maximum borrowings under the Revolving Credit Agreement were $500 million and the weighted-average annual interest rate of borrowings was 2.05%. Borrowings under the Revolving Credit Agreement in March 2020 were repaid in full in April 2020.
The Revolving Credit Agreement contains representations and warranties and affirmative and negative covenants, including financial covenants. As of December 31, 2022, we were in compliance with all covenants under the Revolving Credit Agreement.
Letters of Credit
In addition to the letters of credit that may be issued under the Revolving Credit Agreement, as described above, we have capacity to issue letters of credit up to $350 million, reflecting an increase of $100 million in May 2022, under a bilateral agreement. As of December 31, 2022, approximately $201 million of letters of credit were outstanding under this agreement.
Senior Notes
Long-term debt presented on our consolidated balance sheets as of December 31, 2022 and 2021 consisted of the following debt securities issued by CF Industries:
 Effective Interest RateDecember 31, 2022December 31, 2021
 Principal
Carrying Amount(1)
Principal
Carrying Amount(1)
(in millions)
Public Senior Notes:
3.450% due June 2023
3.665%$— $— $500 $499 
5.150% due March 2034
5.293%750 741 750 741 
4.950% due June 2043
5.040%750 742 750 742 
5.375% due March 2044
5.478%750 740 750 741 
Senior Secured Notes:
4.500% due December 2026(2)
4.783%750 742 750 742 
Total long-term debt$3,000 $2,965 $3,500 $3,465 
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(1)Carrying amount is net of unamortized debt discount and deferred debt issuance costs. Total unamortized debt discount was $7 million and $8 million as of December 31, 2022 and 2021, respectively, and total deferred debt issuance costs were $28 million and $27 million as of December 31, 2022 and 2021, respectively.
(2)Effective August 23, 2021, these notes are no longer secured, in accordance with the terms of the applicable indenture. 
As of December 31, 2022, under the indentures (including the applicable supplemental indentures) governing the senior notes due 2034, 2043 and 2044 identified in the table above (the Public Senior Notes), each series of Public Senior Notes was guaranteed by CF Holdings.
As of December 31, 2022, under the terms of the indenture governing the 4.500% senior secured notes due December 2026 (the 2026 Notes) identified in the table above, the 2026 Notes were guaranteed by CF Holdings. Until August 23, 2021,
the 2026 Notes were also guaranteed by certain subsidiaries of CF Industries. The requirement for subsidiary guarantees of the 2026 Notes was eliminated, and all subsidiary guarantees were automatically released, as a result of an investment grade rating event under the terms of the indenture governing the 2026 Notes on August 23, 2021.
On April 21, 2022, we redeemed in full all of the $500 million outstanding principal amount of the 3.450% senior notes due June 2023 (the 2023 Notes) in accordance with the optional redemption provisions in the indenture governing the 2023 Notes. The total aggregate redemption price paid in connection with the April 2022 redemption of the 2023 Notes, which was funded with cash on hand, was $513 million, including accrued interest. As a result, we recognized a loss on debt extinguishment of $8 million, consisting primarily of the premium paid on the redemption of the $500 million principal amount of the 2023 Notes prior to their scheduled maturity.
On September 10, 2021, we redeemed $250 million principal amount, representing one-third of the $750 million principal amount outstanding immediately prior to such redemption, of the 2023 Notes, in accordance with the optional redemption provisions in the indenture governing the 2023 Notes. The total aggregate redemption price paid in connection with the redemption of the $250 million principal amount of the 2023 Notes was approximately $265 million, including accrued interest. As a result, we recognized a loss on debt extinguishment of $13 million in 2021, consisting primarily of a premium paid on the redemption of the $250 million principal amount of the 2023 Notes prior to their scheduled maturity.
On March 20, 2021, we redeemed in full all of the $250 million outstanding principal amount of the 3.400% senior secured notes due December 2021 (the 2021 Notes), in accordance with the optional redemption provisions in the indenture governing the 2021 Notes. The total aggregate redemption price paid in connection with the redemption of the 2021 Notes, which was funded with cash on hand, was $258 million, including accrued interest. As a result, we recognized a loss on debt extinguishment of $6 million, consisting primarily of the premium paid on the redemption of the $250 million principal amount of the 2021 Notes prior to their scheduled maturity.
Interest on the Public Senior Notes and the 2026 Notes is payable semiannually, and the Public Senior Notes and the 2026 Notes are redeemable at our option, in whole at any time or in part from time to time, at specified make-whole redemption prices.