v3.24.0.1
Fair Value (Tables)
12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
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 December 31, 2023 and 2022 (in millions):
As of December 31, 2023
Level 1Level 2Level 3Total
Assets
Cash equivalents$724 $— $— $724 
Available-for-sale investment securities— 314 16 330 
Aircraft fuel derivatives— — 

As of December 31, 2022
Level 1Level 2Level 3Total
Assets
Cash equivalents$665 $— $— $665 
Available-for-sale investment securities— 324 13 337 
Equity investment securities— — 
Aircraft fuel derivatives— — 
Debt securities, held-to-maturity
The carrying value and estimated fair value of our held-to-maturity investment securities were as follows (in millions):
December 31, 2023December 31, 2022
Carrying ValueFair ValueCarrying ValueFair Value
Held-to-maturity investment securities$234 $231 $177 $170