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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II – Valuation and Qualifying AccountsOccidental Petroleum Corporation
and Subsidiaries

 Additions   
millionsBalance at Beginning of PeriodCharged to
Costs and
Expenses		Charged to
Other
Accounts
Deductions (a)
Balance at
End of
Period		 
2020      
Allowance for doubtful accounts$788 $37 $(3)$— $822 
(b)
Environmental, litigation and other reserves$2,411 $115 $43 $(140)$2,429 
(c)
2019  
Allowance for doubtful accounts$668 $126 $(6)$— $788 
(b)
Environmental, litigation, tax and other reserves$994 $182 $1,408 $(173)$2,411 
(c)
2018 
Allowance for doubtful accounts$594 $77 $(3)$— $668 
(b)
Environmental, litigation, tax and other reserves$935 $140 $85 $(166)$994 
(c)
(a)Primarily represents payments.
(b)Of these amounts, $42 million, $22 million and $24 million in 2020, 2019, and 2018, respectively, are classified as current.
(c)Of these amounts, $149 million, $188 million and $146 million in 2020, 2019, and 2018, respectively, are classified as current.

Note: The amounts presented represent continuing operations.