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DEBT
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
DEBT DEBT
The carrying value of outstanding debt was as follows, in millions:

At December 31,
 20212020
Notes and debentures:  
5.950%, due March 15, 2022
$— $326 
4.450%, due April 1, 2025
— 500 
4.375%, due April 1, 2026
— 498 
3.500%, due November 15, 2027
300 300 
1.500%, due February 15, 2028
599 — 
7.750%, due August 1, 2029
235 235 
2.000%, due October 1, 2030
300 300 
2.000%, due February 15, 2031
596 — 
6.500%, due August 15, 2032
200 200 
4.500%, due May 15, 2047
417 418 
3.125%, due February 15, 2051
300 — 
Other35 33 
Prepaid debt issuance costs(23)(15)
2,959 2,795 
Less: Current portion10 3 
Total long-term debt$2,949 $2,792 
All of the notes and debentures above are senior indebtedness and, other than the 7.75% Notes due 2029, are redeemable at our option.
On March 4, 2021, we issued $600 million of 1.500% Notes due February 15, 2028, $600 million of 2.000% Notes due February 15, 2031 and $300 million of 3.125% Notes due February 15, 2051. We received proceeds of $1,495 million, net of discount, for the issuance of these Notes. The Notes are senior indebtedness and are redeemable at our option at the applicable redemption price. On March 22, 2021, proceeds from the debt issuances, together with cash on hand, were used to repay and early retire our $326 million 5.950% Notes due March 15, 2022, $500 million 4.450% Notes due April 1, 2025, and $500 million 4.375% Notes due April 1, 2026. In connection with these early retirements, we incurred a loss on debt extinguishment of $168 million for the year ended December 31, 2021, which was recorded as interest expense in the consolidated statements of operations.
On September 18, 2020, we issued $300 million of 2.000% Notes due October 1, 2030 (the "2030 Notes") and received proceeds of $300 million, net of discount, for the issuance of the 2030 Notes. Also on September 18, 2020, we issued an incremental $100 million of our existing 4.500% Notes due May 15, 2047 (the "2047 Notes") and received proceeds of $119 million, including a premium, for the issuance of the 2047 Notes. The incremental $100 million formed a single series with the existing $300 million of 4.500% Notes due May 15, 2047. The 2030 Notes and 2047 Notes are senior indebtedness and are redeemable at our option at the applicable redemption price. On September 29, 2020, proceeds from the debt issuances were used to repay and early retire our $400 million 3.500% Notes due April 1, 2021. In connection with this early retirement, we incurred a loss on debt extinguishment of $6 million, which was recorded as interest expense in our consolidated statements of operations.
On December 19, 2019, proceeds from the UKWG and Milgard divestitures were used to repay and early retire our $201 million 7.125% Notes due March 15, 2020. In connection with this early retirement, we incurred a loss on debt extinguishment of $2 million for the year ended December 31, 2019, which was recorded as interest expense in our consolidated statements of operations.
L. DEBT (Continued)

On March 13, 2019, we entered into a credit agreement (the “Credit Agreement”) with an aggregate commitment of $1.0 billion and a maturity date of March 13, 2024. On December 22, 2021, we amended the Credit Agreement with the bank group (the "Amended Credit Agreement"). The Credit Agreement was amended to (i) expand the “Agreed Currencies” for which loans thereunder may be denominated outside of the swingline facility to include British Pounds Sterling and Canadian Dollars, together with their applicable interest rate benchmark, (ii) replace the London Interbank Offering Rate (“LIBOR”) with the Euro Interbank Offered Rate (“EURIBOR”) as the interest rate benchmark for purposes of loans denominated in Euros and (iii) provide mechanics for the replacement of a benchmark for an applicable Agreed Currency upon the occurrence of certain specified events. Under the Amended Credit Agreement, the replacement reference interest rate benchmark for loans denominated in U.S. dollars upon the eventual discontinuation of LIBOR will have a benchmark adjustment applied based on its historical relationship to LIBOR, which can be either the term Secured Overnight Financing Rate (“SOFR”) plus a spread, daily simple SOFR plus a spread, or another alternative interest rate index selected by the Administrative Agent and us.
Under the Amended 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. Upon entry into the Credit Agreement, our credit agreement dated March 28, 2013, as amended, with an aggregate commitment of $750 million, was terminated.
The Amended 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 $500 million, equivalent. We can also borrow swingline loans up to $100 million and obtain letters of credit of up to $25 million; outstanding letters of credit under the Amended Credit Agreement reduce our borrowing capacity. At December 31, 2021, we had no outstanding standby letters of credit under the Amended Credit Agreement.
Revolving credit loans denominated in U.S. Dollars bear interest under the Amended Credit Agreement at a rate per annum equal to the greater of (i) the JPMorgan Chase Bank, N.A. prime rate, (ii) the Federal Reserve Bank of New York effective rate plus 0.50% and (iii) adjusted LIBO Rate plus 1.0%; plus an applicable margin based upon our then-applicable corporate credit ratings. Foreign currency revolving credit loans denominated in Canadian Dollars bear interest under the Amended Credit Agreement at a rate per annum equal to the greater of (i) the rate equal to the PRIMCAN Index rate and (ii) the CDOR Rate for a one month interest period, plus 1.0%; plus an applicable margin based upon our then-applicable corporate credit ratings. Foreign currency revolving credit loans denominated in Pounds Sterling bear interest under the Amended Credit Agreement at a rate per annum equal to the Daily Simple SONIA plus 0.0326%. Foreign currency revolving credit loans denominated in Euros bear interest at the adjusted EURIBOR Rate, plus an applicable margin based upon our then-applicable corporate credit ratings. The various benchmarks are subject to applicable floors as specified in the Amended Credit Agreement. The Amended Credit Agreement also provides mechanics for the replacement of a benchmark upon the occurrence of certain specified events.
The Amended 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) a minimum interest coverage ratio, as adjusted for certain items, not less than 2.5 to 1.0.
In order for us to borrow under the Amended Credit Agreement, there must not be any default in our covenants in the Amended Credit Agreement (i.e., in addition to the two financial covenants, principally limitations on subsidiary debt, negative pledge restrictions, legal compliance requirements and maintenance of properties and insurance) and our representations and warranties in the Amended 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, 2018, no material ERISA or environmental non-compliance, and no material tax deficiency). We were in compliance with all covenants and no borrowings were outstanding at December 31, 2021. 
At December 31, 2021, the debt maturities during each of the next five years were as follows: 2022 – $10 million; 2023– $5 million; 2024 – $3 million; 2025 – $3 million and 2026 – $2 million.
L. DEBT (Concluded)

Interest paid was $114 million, $136 million and $157 million in 2021, 2020 and 2019, respectively. These amounts exclude $160 million, $5 million and $2 million of debt extinguishment costs related to the early retirement of debt, which were recorded as interest expense and paid in 2021, 2020 and 2019, respectively.