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Fair Value (Tables)
 9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Fair value, by Balance Sheet Grouping
The following is a listing of our assets required to be measured at fair value on a recurring basis and where they are classified within the fair value hierarchy as of September 30, 2024 and December 31, 2023 (in millions):
September 30, 2024
Level 1Level 2Level 3Total
Assets
Cash equivalents$2,286 $— $— $2,286 
Restricted cash equivalents72 — — 72 
Available-for-sale investment securities— 1,317 16 1,333 
December 31, 2023
Level 1Level 2Level 3Total
Assets
Cash equivalents$724 $— $— $724 
Available-for-sale investment securities— 314 16 330 
Aircraft fuel derivatives— 4 — 4 
Schedule of Debt Securities, Held-to-Maturity The carrying value and estimated fair value of our held-to-maturity investment securities were as follows (in millions):
September 30, 2024December 31, 2023
Carrying ValueFair ValueCarrying ValueFair Value
Held-to-maturity investment securities$175 $175 $234 $231