XML 78 R48.htm IDEA: XBRL DOCUMENT v3.20.4
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PROPERTY, PLANT AND EQUIPMENT AND GOODWILL (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Capitalized exploratory well costs for continuing operations        
Balance — beginning of year $ 424 $ 424 $ 112 $ 108
Exploratory well costs acquired through the Acquisition   0 231 0
Additions to capitalized exploratory well costs pending the determination of proved reserves   122 383 220
Reclassifications to property, plant and equipment based on the determination of proved reserves   (309) (230) (198)
Capitalized exploratory well costs charged to expense   (26) (72) (18)
Balance — end of year   211 424 $ 112
Net capitalized costs attributable to unproved properties   $ 18,600 29,500  
Goodwill derecognized $ 1,200      
Chemical | Low end of range        
Capitalized exploratory well costs for continuing operations        
The estimated useful lives of Occidental's chemical assets   3 years    
Chemical | High end of range        
Capitalized exploratory well costs for continuing operations        
The estimated useful lives of Occidental's chemical assets   50 years    
Midstream and marketing        
Capitalized exploratory well costs for continuing operations        
Goodwill     $ 1,200