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Debt and Letters of Credit
 6 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Debt and Letters of Credit Debt and Letters of Credit
Debt consisted of the following:
(in millions)June 30, 2022December 31, 2021
Borrowings under credit facility$— $— 
Current:
2023 Notes$153 $— 
Other borrowings28 18 
Total current$181 $18 
Long-term:
Senior Notes
2023 Notes$— $193 
2024 Notes381 381 
Unamortized discount on 2024 Notes(1)(1)
Unamortized deferred financing costs(1)(1)
2028 Notes600 600 
Unamortized discount on 2028 Notes(1)(1)
Unamortized deferred financing costs(3)(3)
Other long-term borrowings5 6 
Total long-term$980 $1,174 

Credit Facility

As of June 30, 2022, letters of credit totaling $338 million were outstanding under our $1.8 billion credit facility, which matures in February 2025. The credit facility contains customary financial covenants, including a debt-to-capitalization ratio that cannot exceed 0.60 to 1.0, a limitation on the aggregate amount of debt of the greater of $750 million or €750 million for our subsidiaries, and a minimum liquidity threshold of $1.2 billion, defined in the amended credit facility, which may be reduced to $1.0 billion upon the repayment of debt. The credit facility also contains provisions that will require us to provide collateral to secure the facility should we be downgraded to BB by S&P and Ba2 by Moody's, such collateral consisting broadly of our U.S. assets. Borrowings under the facility, which may be denominated in USD, EUR, GBP or CAD, bear interest at a base rate, plus an applicable borrowing margin. As of June 30, 2022, we had availability to borrow $785 million under our credit facility.
Uncommitted Lines of Credit
As of June 30, 2022, letters of credit totaling $960 million were outstanding under uncommitted lines of credit.
Senior Notes
In June 2022, we redeemed $23 million of outstanding 2023 Notes. In June 2021, we redeemed $5 million of outstanding 2023 and 2024 Notes. T