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Long-Term Debt (Tables)
 3 Months Ended
Mar. 31, 2023
Debt Disclosure [Abstract]  
Long-term Debt Summary
A summary of our debt as of March 31, 2023 and December 31, 2022 is as follows:

March 31, 2023December 31, 2022
Principal AmountCarrying ValueFair ValuePrincipal AmountCarrying ValueFair Value
Senior unsecured notes$27,250 $27,159 $23,638 $26,650 $26,567 $22,426 
Senior secured notes and debentures(a)
55,873 56,230 47,636 56,841 57,213 46,905 
Credit facilities(b)
14,640 14,583 14,267 13,877 13,823 13,467 
$97,763 $97,972 $85,541 $97,368 $97,603 $82,798 

(a)Includes the Company's £625 million fixed-rate British pound sterling denominated notes (the “Sterling Notes”) (remeasured at $771 million and $755 million as of March 31, 2023 and December 31, 2022, respectively, using the exchange rate at the respective dates) and the Company's £650 million aggregate principal amount of Sterling Notes (remeasured at $802 million and $786 million as of March 31, 2023 and December 31, 2022, respectively, using the exchange rate at the respective dates).
(b)The Company has availability under the Charter Operating credit facilities of approximately $3.3 billion as of March 31, 2023.