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FAIR VALUE MEASUREMENTS (Tables)
3 Months Ended
Mar. 31, 2022
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 March 31, 2022 and December 31, 2021:
Fair Value
Millions of dollarsTotal Cost BasisLevel 1Level 2Total
Measured at fair value on a recurring basis:20222021202220212022202120222021
Short-term investments (1)
$1,339 $1,905 $1,008 $1,697 $331 $208 $1,339 $1,905 
Net derivative contracts —  — 41 66 41 66 
(1)Short-term investments are primarily comprised of money market funds and highly liquid, low risk investments with initial maturities less than 90 days.