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Fair Value (Tables)
12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Fair value, by balance sheet grouping
The following is a listing of our assets and liabilities required to be measured at fair value on a recurring basis and where they are classified within the fair value hierarchy (in millions):
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— — 
As of December 31, 2021
Level 1Level 2Level 3Total
Assets
Cash equivalents$1,515 $— $— $1,515 
Available-for-sale investment securities— 800 — 800 
Equity investment securities26 — — 26