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Financing Agreements (Tables)
 9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Components of long-term debt
Long-term debt presented on our consolidated balance sheets as of September 30, 2021 and December 31, 2020 consisted of the following debt securities issued by CF Industries:
 Effective Interest RateSeptember 30, 2021December 31, 2020
 Principal
Carrying Amount(1)
Principal
Carrying Amount(1)
(in millions)
Public Senior Notes:
3.450% due June 2023
3.562%$500 $499 $750 $748 
5.150% due March 2034
5.279%750 741 750 741 
4.950% due June 2043
5.031%750 742 750 742 
5.375% due March 2044
5.465%750 742 750 741 
Senior Secured Notes:
3.400% due December 2021
3.782%— — 250 249 
4.500% due December 2026(2)
4.759%750 741 750 740 
Total long-term debt$3,500 $3,465 $4,000 $3,961 
Less: Current maturities of long-term debt— — 250 249 
Long-term debt, net of current maturities$3,500 $3,465 $3,750 $3,712 
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(1)Carrying amount is net of unamortized debt discount and deferred debt issuance costs. Total unamortized debt discount was $8 million and $9 million as of September 30, 2021 and December 31, 2020, respectively, and total deferred debt issuance costs were $27 million and $30 million as of September 30, 2021 and December 31, 2020, respectively. 
(2)Effective August 23, 2021, these notes are no longer secured, in accordance with the terms of the applicable indenture.