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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2021
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		 
2021      
Allowance for doubtful accounts$822 $56 $(11)$— $867 
(b)
Environmental, litigation, tax and other reserves$2,429 $900 $94 $(259)$3,164 
(c)
2020  
Allowance for doubtful accounts$788 $37 $(3)$— $822 
(b)
Environmental, litigation, tax 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)
(a)Primarily represents payments.
(b)Of these amounts, $46 million, $42 million and $22 million in 2021, 2020, and 2019, respectively, were classified as current.
(c)Of these amounts, $790 million, $149 million and $188 million in 2021, 2020, and 2019, respectively, were classified as current.

Note: The amounts presented represent continuing operations.