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FAIR VALUE MEASUREMENTS (Tables)
6 Months Ended
Jun. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following table summarizes the valuation of our assets and liabilities measured at fair value on a recurring basis at June 30, 2024 and December 31, 2023:
Fair Value
Millions of dollarsTotal Cost BasisLevel 1Level 2Total
Measured at fair value on a recurring basis:20242023202420232024202320242023
Short-term investments (1)
$784 $1,126 $456 $867 $328 $259 $784 $1,126 
Net derivative contracts —  — (17)(105)(17)(105)
(1)Short-term investments are primarily comprised of money market funds and highly liquid, low risk investments with initial maturities less than 90 days.