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INVESTMENTS AND RELATED-PARTY TRANSACTIONS (Tables)
 12 Months Ended
Dec. 31, 2020
Investments And Related Party Transactions Disclosure [Abstract]  
Schedule of significant equity investments As of December 31, 2020, Occidental’s significant equity investments primarily consisted of the following:
millions% InterestCarrying amount
WES (a)
53.5 %$1,930 
OxyChem Ingleside Facility50.0 %635 
Dolphin Energy Limited24.5 %290 
Othervarious395 
Total$3,250 
(a)     During most of 2019, WES was a consolidated variable interest entity. On December 31, 2019, Occidental unconsolidated WES. See Note 1 - Summary of Significant Accounting Policies for more information on the accounting treatment and resulting equity interest. In the first quarter of 2020, Occidental recorded an impairment of $1.2 billion in goodwill related to its ownership in WES and in the third quarter of 2020, recorded an other than temporary impairment of $2.7 billion related to the WES equity method investment. See Note 17 - Fair Value Measurements for more information on the impairments.
Summarized financial information of equity-method investments
The following table presents the summarized financial information of its equity-method investments combined for the years ended and as of December 31:

millions202020192018
Summarized Results of Operations (a)
Revenues and other income$5,455 $26,520 $28,091 
Costs and expenses5,455 24,084 25,029 
Net income$— $2,436 $3,062 
Summarized Balance Sheet
Current assets$1,419 $1,130 $5,587 
Non-current assets$18,693 $21,158 $25,871 
Current liabilities$1,549 $785 $4,879 
Long-term debt$7,860 $8,673 $12,505 
Other non-current liabilities$866 $859 $95 
Stockholders’ equity$9,837 $11,971 $13,979 
(a)The 2019 Summarized Results of Operations include results of Plains for the period beginning January 1, 2019 through the date Occidental’s interest was sold in September 2019. Plains accounted for $24.7 billion of equity-method investment revenues and other income in 2019.
Summary of related-party transactions During 2020, 2019 and 2018, Occidental entered into the following related-party transactions and had the following amounts due from or to its related parties for the years ended December 31:
millions202020192018
Sales (a,c)
$301 $691 $805 
Purchases (b,c)
$1,112 $463 $502 
Services (d)
$1,032 $28 $52 
Advances and amounts due from related parties$54 $133 $63 
Amounts due to related parties $273 $463 $46 
(a)In 2020, sales of Occidental-produced NGL and marketing fees to WES accounted for 70% of these totals. In 2019 and 2018, sales of Occidental-produced oil and NGL to Plains Pipeline affiliates accounted for 87% and 89% of these totals, respectively. In September 2019, Occidental sold its equity investment in Plains. See Note 4 - Divestitures and Other Transactions for additional information.
(b)In 2020, purchases of gas and NGL marketed on behalf of WES accounted for 59% of related-party purchases. In 2020, 2019 and 2018, purchases of ethylene from the Ingleside ethylene cracker accounted for 41%, 98% and 98% of related-party purchases, respectively.
(c)Excluded sales to and purchases from WES in 2019 as it was a consolidated subsidiary from the date of the Acquisition through December 31, 2019.
(d)In 2020, services primarily relates to fees charged by WES to gather, process and treat Occidental produced oil, NGL and natural gas.