INCOME TAXES - COMPONENTS OF DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax liabilities
Property, plant and equipment differences	$ (10,744)	$ (12,375)
Equity investments, partnerships and foreign subsidiaries	(658)	(989)
Gross long-term deferred tax liabilities	(11,402)	(13,364)
Deferred tax assets
Environmental reserves	257	261
Postretirement benefit accruals	398	441
Deferred compensation and benefits	186	266
Asset retirement obligations	942	906
Foreign tax credit carryforwards	4,465	4,379
General business credit carryforwards	607	443
Net operating loss carryforward	1,797	692
Interest expense carryforward	668	492
All other	720	782
Gross long-term deferred tax assets	10,040	8,662
Valuation allowance	(5,695)	(4,959)
Net long-term deferred tax assets	4,345	3,703
Total deferred income taxes, net	(7,057)	(9,661)
Net long-term deferred tax assets	(56)	(56)
Total deferred income taxes	$ (7,113)	$ (9,717)

Deferred Tax Asset, Foreign, Long-term Receivables and Noncurrent Assets, Net

No definition available.

Name:	oxy_DeferredTaxAssetForeignLongtermReceivablesandNoncurrentAssetsNet
Namespace Prefix:	oxy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from currently non-deductible expenses in environmental reserves, which can only be deducted for tax purposes when such liabilities are actually incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

+ References

No definition available.