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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments Fair Value of Financial Instruments        The carrying amount of cash and equivalents, receivables and accounts payable, as reflected in the condensed consolidated balance sheets, approximates fair value due to the short maturities of these instruments.
The carrying amount and fair value of our total debt, including short-term borrowings and current maturities of long-term debt, is as follows:
June 30, 2020December 31, 2019
Millions of dollarsLevel 1Level 2Total fair valueCarrying valueLevel 1Level 2Total fair valueCarrying value
Total debt$7,894  $2,690  $10,584  $9,826  $11,093  $868  $11,961  $10,327  

The total fair value of our debt decreased during the first half of 2020, primarily due to the negative impact on our business and industry associated with the COVID-19 pandemic and OPEC+ disagreements as described in Note 2. These events have collectively increased the credit spreads for all of our publicly traded bonds, thus reducing the associated fair value. Additionally, the fair value and carrying value of our debt decreased in the first half of 2020 due to an early repurchase of senior notes. See Note 6 for further information.

Our debt categorized within level 1 on the fair value hierarchy is calculated using quoted prices in active markets for identical liabilities with transactions occurring on the last two days of period-end. Our debt categorized within level 2 on the fair value hierarchy is calculated using significant observable inputs for similar liabilities where estimated values are determined from observable data points on our other bonds and on other similarly rated corporate debt or from observable data points of transactions occurring prior to two days from period-end and adjusting for changes in market conditions. Differences between the periods presented in our level 1 and level 2 classification of our long-term debt relate to the timing of when third party market transactions on our debt are executed. We have no debt categorized within level 3 on the fair value hierarchy.