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Consolidated Statements of Stockholders' Equity (USD $)
In Millions, unless otherwise specified
Common Stock
Treasury Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interest
Total
Balance at Dec. 31, 2011 $ 177us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (4,502)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 7,286us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 35,142us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (483)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
  $ 37,620us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Increase (Decrease) in Stockholders' Equity              
Net income       4,598us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    4,598us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of taxes         (19)oxy_OtherComprehensiveIncomeLossNetOfTaxes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
  (19)oxy_OtherComprehensiveIncomeLossNetOfTaxes
Dividends on common stock       (1,750)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    (1,750)us-gaap_DividendsCommonStockCash
Issuance of common stock and other, net 1oxy_IssuanceOfCommonStockAndOtherNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  155oxy_IssuanceOfCommonStockAndOtherNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      156oxy_IssuanceOfCommonStockAndOtherNet
Noncontrolling interest contributions           32us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
32us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination
Purchases of treasury stock   (589)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
        (589)us-gaap_TreasuryStockValueAcquiredCostMethod
Balance at Dec. 31, 2012 178us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(5,091)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
7,441us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
37,990us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(502)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
32us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
40,048us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Increase (Decrease) in Stockholders' Equity              
Net income       5,903us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    5,903us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of taxes         199oxy_OtherComprehensiveIncomeLossNetOfTaxes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
  199oxy_OtherComprehensiveIncomeLossNetOfTaxes
Dividends on common stock       (2,062)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    (2,062)us-gaap_DividendsCommonStockCash
Issuance of common stock and other, net     74oxy_IssuanceOfCommonStockAndOtherNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      74oxy_IssuanceOfCommonStockAndOtherNet
Noncontrolling interest contributions           214us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
214us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination
Purchases of treasury stock   (1,004)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
        (1,004)us-gaap_TreasuryStockValueAcquiredCostMethod
Balance at Dec. 31, 2013 178us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(6,095)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
7,515us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
41,831us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(303)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
246us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
43,372us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Increase (Decrease) in Stockholders' Equity              
Net income       616us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    616us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of taxes         (76)oxy_OtherComprehensiveIncomeLossNetOfTaxes
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
  (76)oxy_OtherComprehensiveIncomeLossNetOfTaxes
Dividends on common stock       (2,252)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    (2,252)us-gaap_DividendsCommonStockCash
Issuance of common stock and other, net     84oxy_IssuanceOfCommonStockAndOtherNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      84oxy_IssuanceOfCommonStockAndOtherNet
Noncontrolling interest distributions, net           (246)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
(246)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Distribution of California Resources stock to shareholders       (4,128)oxy_DistributionOfStockOfSubsidiaryToShareholders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
22oxy_DistributionOfStockOfSubsidiaryToShareholders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
  (4,106)oxy_DistributionOfStockOfSubsidiaryToShareholders
Purchases of treasury stock   (2,433)us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
        (2,433)us-gaap_TreasuryStockValueAcquiredCostMethod
Balance at Dec. 31, 2014 $ 178us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ (8,528)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 7,599us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 36,067us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ (357)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
  $ 34,959us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest