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Long-Term Debt (Tables)
3 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Long-term Debt Summary
A summary of our debt as of March 31, 2022 and December 31, 2021 is as follows:

March 31, 2022December 31, 2021
Principal AmountCarrying ValueFair ValuePrincipal AmountCarrying ValueFair Value
Senior unsecured notes$25,150 $25,072 $23,755 $23,950 $23,882 $24,630 
Senior secured notes and debentures(a)
59,975 60,398 60,198 56,525 57,011 64,346 
Credit facilities(b)
9,804 9,752 9,741 10,723 10,668 10,665 
$94,929 $95,222 $93,694 $91,198 $91,561 $99,641 

(a)Includes the Company's £625 million and £650 million fixed-rate British pound sterling denominated notes (the “Sterling Notes”) remeasured using the exchange rate at the respective dates.
(b)The Company has availability under the Charter Operating credit facilities of approximately $4.7 billion as of March 31, 2022.