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Fair Value Measurements
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements
NOTE 6 - FAIR VALUE MEASUREMENTS

Occidental has categorized its assets and liabilities that are measured at fair value in a three-level fair value hierarchy, based on the inputs to the valuation techniques: Level 1 — using quoted prices in active markets for the assets or liabilities; Level 2 — using observable inputs other than quoted prices for the assets or liabilities; and Level 3 — using unobservable inputs. Transfers between levels, if any, are recognized at the end of each reporting period.

FAIR VALUES - RECURRING
In January 2012, Occidental entered into a long-term contract to purchase carbon dioxide (CO2). This contract contains a price adjustment clause that is linked to changes in NYMEX oil prices. Occidental determined that the portion of this contract linked to NYMEX oil prices is not clearly and closely related to the host contract, and Occidental therefore bifurcated this embedded pricing feature from its host contract and accounts for it at fair value in the consolidated financial statements.
The following tables provide fair value measurement information for embedded derivatives that are measured on a recurring basis:

millionsFair Value Measurements Using
Embedded derivativesLevel 1Level 2Level 3Netting and
Collateral
Total Fair
Value
As of March 31, 2021
Accrued liabilities$ $32 $ $ $32 
As of December 31, 2020
Accrued liabilities$— $64 $— $— $64 

FAIR VALUES - NONRECURRING
In the first quarter 2021, Occidental recorded pre-tax impairments of $135 million related to non-core domestic undeveloped leases that either expired in the first quarter of 2021 or were set to expire in the near-term, where Occidental had no plans to pursue exploration activities.