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FAIR VALUE MEASUREMENTS (Tables)
9 Months Ended
Sep. 30, 2023
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,
2023
Level 1Level 2Level 3
Cash equivalents$1,854 $1,854 $— $— 
Restricted cash equivalents134 134 — — 
Short-term investments
U.S. Government securities1,162 239 923 — 
Corporate obligations857 — 857 — 
Asset-backed securities86 — 86 — 
Other fixed income securities65 — 65 — 
Long-term investments and related1,647 1,342 130 175 
Fuel hedge contracts12 — 12 — 
(in millions)December 31,
2022
Level 1Level 2Level 3
Cash equivalents$2,021 $2,021 $— $— 
Restricted cash equivalents206 206 — — 
Short-term investments
U.S. Government securities1,587 122 1,465 — 
Corporate obligations1,614 — 1,614 — 
Other fixed income securities67 — 67 — 
Long-term investments1,450 1,305 38 107 
Fuel hedge contracts(47)— (47)—