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FAIR VALUE MEASUREMENTS (Tables)
9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Assets/(Liabilities) Measured at Fair Value on a Recurring Basis
Assets/(Liabilities) Measured at Fair Value on a Recurring Basis
(in millions)September 30,
2024
Level 1Level 2Level 3
Cash equivalents$2,718 $2,718 $— $— 
Restricted cash equivalents316 316 — — 
Short-term investments - Other fixed income securities— — 
Long-term investments and related2,723 2,460 149 114 
Fuel hedge contracts— — 

(in millions)December 31,
2023
Level 1Level 2Level 3
Cash equivalents$1,545 $1,545 $— $— 
Restricted cash equivalents653 653 — — 
Short-term investments
U.S. Government securities859 204 655 — 
Corporate obligations218 — 218 — 
Other fixed income securities50 — 50 — 
Long-term investments and related2,867 2,614 134 119 
Fuel hedge contracts— —