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Total Debt (Tables)
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Total Debt Summary
A summary of our debt as of September 30, 2023 and December 31, 2022 is as follows:

September 30, 2023December 31, 2022
Principal AmountCarrying ValueFair ValuePrincipal AmountCarrying ValueFair Value
Senior unsecured notes$27,250 $27,165 $23,083 $26,650 $26,567 $22,426 
Senior secured notes and debentures(a)
55,855 56,201 44,541 56,841 57,213 46,905 
Credit facilities(b)
14,483 14,433 14,175 13,877 13,823 13,467 
$97,588 $97,799 $81,799 $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 $762 million and $755 million as of September 30, 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 $793 million and $786 million as of September 30, 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 September 30, 2023.