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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value, Assets 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, 2020 and December 31, 2019 are as follows:






Fair Value
Millions of dollars

Total Cost Basis

Level 1(2)

Level 2

Total
Measured at fair value on a recurring basis:

2020
 
2019

2020
 
2019

2020

2019

2020
 
2019
Short-term investments (1)

$
2,027


$
1,308


$
1,413


$
398


$
614


$
910


$
2,027


$
1,308

Net derivative contracts









135


5


135


5

(1) 
Short-term investments are primarily comprised of money market funds and highly liquid, low risk investments with initial maturities less than 90 days.
(2) 
Increase in level 1 investments reflect invested proceeds from the credit facility borrowings.