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Debt
 12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Debt DEBT
Amendments to Credit Agreement
In June 2023, we entered into an Amendment No. 2 to our Credit Agreement amending certain of the terms, including, among other things, the replacement of the interest rate provisions related to the Term Loan Facility from Eurodollar Rate to Term SOFR (as defined in the Credit Agreement).
In October 2022, we amended the Credit Agreement to increase the Revolving Credit Facility commitments by $250 million to aggregate commitments of $1.0 billion. The amendment also extended the Revolving Credit Facility maturity date to October 19, 2027, replaced the Revolving Credit Facility's LIBOR interest rate references with Term SOFR, and incorporated various amendments, including amendments to pricing, guarantee and collateral provisions, that will become effective if we receive an investment-grade rating from two of the three credit rating agencies.
Debt Issuances
In April 2022, we issued $600 million in aggregate principal amount of 4.300% senior secured notes due April 2032. The 2032 Notes are guaranteed by certain of our subsidiaries and secured by a first priority lien on certain assets of DT Midstream and our subsidiary guarantors that secure our existing credit facilities. The 2032 Notes have a security fall away provision where the collateral securing the notes will be released if we receive an investment-grade rating from two of the three credit rating agencies.
In June 2021, we issued the senior unsecured notes of $1.1 billion in aggregate principal amount due June 15, 2029 and $1.0 billion in aggregate principal amount due June 15, 2031.
Debt Redemptions
In April 2022, we used $593 million of the net proceeds from the sale of the 2032 Notes to make a partial repayment on the existing indebtedness under the Term Loan Facility. As a result, required quarterly principal payments were eliminated, and the remaining Term Loan Facility balance is not due until maturity in 2028. There were no prepayment costs in conjunction with the partial redemption of the Term Loan Facility. The early redemption resulted in a loss on extinguishment of debt of $9 million and loss on modification of debt of $4 million relating to the write-off of unamortized discount and issuance costs, which was recorded as a loss from financing activities in our Consolidated Statements of Operations for the year ended December 31, 2022.
Interest Expense
The following table summarizes our interest expense:
Year Ended December 31,
202320222021
(millions)
Interest expense$170 $142 $113 
Capitalized interest(20)(5)(1)
Total interest expense, net$150 $137 $112 
Long-Term Debt
The following is a summary of long-term debt:
MaturityDecember 31,December 31,
TitleTypeInterest RateDate20232022
(millions)
2029 Notes
Senior Notes (a)
4.125%2029$1,100 $1,100 
2031 Notes
Senior Notes (a)
4.375%20311,000 1,000 
2032 Notes
Senior Secured Notes (b)
4.300%2032600 600 
Term Loan FacilityTerm Loan Facility
Variable (c)
2028399 399 
Long-term debt principal3,099 3,099 
Unamortized debt discount(2)(3)
Unamortized debt issuance costs (32)(37)
Long-term debt, net$3,065 $3,059 
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(a) Interest payable semi-annually in arrears each June 15 and December 15.
(b) Interest payable semi-annually in arrears each April 15 and October 15.
(c) Variable rate is SOFR plus 2.11% for a one-month interest period as of December 31, 2023.

The following table presents scheduled debt maturities, excluding any unamortized discount on debt:
20242025202620272028 and ThereafterTotal
(millions)
Debt maturities$— — — — 3,099 $3,099 
Short-Term Credit Arrangements and Borrowings
The following table presents the availability under the Revolving Credit Facility:
December 31,
2023
(millions)
Total availability
Revolving Credit Facility, expiring October 2027
$1,000 
Amounts outstanding
Revolving Credit Facility borrowings (a)
165 
Letters of credit16 
181 
Net availability $819 
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(a) The weighted average interest rate for Revolving Credit Facility borrowings outstanding is 6.72%.
Borrowings under the Revolving Credit Facility are used for general corporate purposes, acquisitions, and letter of credit issuances to support our operations and liquidity. In April 2023, certain letters of credit totaling $23 million were replaced with surety bonds. See Note 12, "Commitments and Contingencies" for additional information. Revolving Credit Facility related issuance and amendment costs, net of amortization, were $6 million and $8 million, as of December 31, 2023 and 2022, respectively. These costs are included in other noncurrent assets in our Consolidated Statements of Financial Position and are being amortized over the remaining term of the Revolving Credit Facility.
The Credit Agreement covering the Term Loan Facility and Revolving Credit Facility includes financial covenants that we must maintain. These covenants restrict the ability of DT Midstream and our subsidiaries to incur additional indebtedness and guarantee indebtedness, create or incur liens, engage in mergers, consolidations, liquidations or dissolutions, sell, transfer or otherwise dispose of assets, make investments, acquisitions, loans or advances, pay dividends and distributions or repurchase capital stock, prepay, redeem or repurchase certain junior indebtedness, enter into agreements that limit the ability of the restricted subsidiaries to make distributions to DT Midstream or the ability of DT Midstream and our restricted subsidiaries to incur liens on assets and enter into certain transactions with affiliates. The Term Loan Facility requires the maintenance of a minimum debt service coverage ratio of 1.1 to 1, and the Revolving Credit Facility requires maintenance of (i) a maximum consolidated net leverage ratio of 5 to 1, and (ii) a minimum interest coverage ratio of no less than 2.5 to 1. The debt service coverage ratio means the ratio of annual consolidated EBITDA to debt service, as defined in the Credit Agreement. The consolidated net leverage ratio means the ratio of net debt determined in accordance with GAAP to annual consolidated EBITDA. The interest coverage ratio means the ratio of annual consolidated EBITDA to annual interest expense, as defined in the Credit Agreement. The Credit Agreement definition of annual consolidated EBITDA excludes EBITDA from equity method investees, but includes dividends and distributions from equity method investees. As of December 31, 2023, the debt service coverage ratio, the consolidated net leverage ratio and the interest coverage ratio was 8.3 to 1, 2.4 to 1 and 7.8 to 1, respectively, and we were in compliance with these financial covenants.
Dividend Restrictions
The indenture governing the 2029 and 2031 Notes permits the payment of quarterly dividends on common stock in each fiscal year up to a dividend capacity calculated as defined in the indenture. For 2023, the dividend capacity remaining at year end was $356 million.
The Credit Agreement permits the payment of quarterly dividends on common stock in each fiscal year as long as giving pro forma effect thereto, we maintain a first lien net leverage ratio that does not exceed 3.25 to 1. We maintained such first lien net leverage ratio as of December 31, 2023.