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STOCK-BASED INCENTIVE PLANS (Details) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) item $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Aggregate number of shares authorized for issuance |  |  |  | 35,000,000 |
Maximum shares available for future issuance |  |  |  |  | 30,000,000
Number of shares counted for each share covered by an award in determining the number of shares that are available for future awards | 3 |  |  |  |
Number of times, as applicable, shares available for future awards may increase by shares that fail to vest, or are forfeited or canceled, or correspond to the portion of any stock-based awards settled in cash | item | 3 |  |  |  |
Certain stock-based incentive amounts |  |  |  |  |
Compensation expense (in dollars) | $ | $ 121 | $ 49 | $ 129 |  |
Income tax benefit recognized in the income statement (in dollars) | $ | $ 43 | 17 | 46 |  |
Unrecognized compensation expense | $ |  |  |  | $ 231 |
Weighted-average period over which unrecognized compensation expense is expected to be recognized | 2 years 2 months 12 days |  |  |  |
High end of range |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Maximum shares available for future issuance |  |  |  | 30,000,000 |
Employee |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Aggregate number of shares authorized for issuance |  |  |  | 4,500,000 |
Common Stock | Non-employee directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Restricted stock granted to non-employee directors | 23,888 |  |  |  |
RSUs |  |  |  |  |
Stock-Based Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 7 years |  |  |  |
RSUs | Low end of range |  |  |  |  |
Stock-Based Awards |  |  |  |  |
Award vesting period | 1 year |  |  |  |
RSUs | High end of range |  |  |  |  |
Stock-Based Awards |  |  |  |  |
Award vesting period | 4 years |  |  |  |
Cliff vested RSU's | Low end of range |  |  |  |  |
Certain stock-based incentive amounts |  |  |  |  |
Weighted-average period over which unrecognized compensation expense is expected to be recognized | 1 year |  |  |  |
Cliff vested RSU's | High end of range |  |  |  |  |
Certain stock-based incentive amounts |  |  |  |  |
Weighted-average period over which unrecognized compensation expense is expected to be recognized | 3 years |  |  |  |
Cash-Settled RSUs |  |  |  |  |
Certain stock-based incentive amounts |  |  |  |  |
Cash paid | $ | $ 41 | $ 39 | $ 64 |  |
Roll-forward of stock awards other than options and SARS. |  |  |  |  |
Unvested, beginning of period (in shares) | 1,130,000 |  |  |  |
Granted (in shares) | 53,000 |  |  |  |
Vested (in shares) | (536,000) |  |  |  |
Forfeitures (in shares) | (46,000) |  |  |  |
Unvested, end of period (in shares) | 601,000 | 1,130,000 |  |  |
Stock awards other than options and SARs, weighted-average grant-date fair value (in dollars per share) |  |  |  |  |
Unvested, beginning of period, weighted-average grant-date fair value (in dollars per share) | $ / shares | $ 81.06 |  |  |  |
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares | 75.57 | $ 72.64 | $ 100.95 |  |
Vested, weighted-average grant-date fair value (in dollars per share) | $ / shares | 83.18 |  |  |  |
Forfeitures, weighted-average grant-date fair value (in dollars per share) | $ / shares | 80.89 |  |  |  |
Unvested, end of period, weighted-average grant-date fair value (in dollars per share) | $ / shares | $ 78.70 | $ 81.06 |  |  |
Stock-Settled RSUs |  |  |  |  |
Certain stock-based incentive amounts |  |  |  |  |
Fair value of shares vested during the year | $ | $ 31 | $ 28 | $ 56 |  |
Roll-forward of stock awards other than options and SARS. |  |  |  |  |
Unvested, beginning of period (in shares) | 1,758,000 |  |  |  |
Granted (in shares) | 2,238,000 |  |  |  |
Vested (in shares) | (417,000) |  |  |  |
Forfeitures (in shares) | (79,000) |  |  |  |
Unvested, end of period (in shares) | 3,500,000 | 1,758,000 |  |  |
Stock awards other than options and SARs, weighted-average grant-date fair value (in dollars per share) |  |  |  |  |
Unvested, beginning of period, weighted-average grant-date fair value (in dollars per share) | $ / shares | $ 81.19 |  |  |  |
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares | 74.82 | $ 72.54 | $ 101.77 |  |
Vested, weighted-average grant-date fair value (in dollars per share) | $ / shares | 82.35 |  |  |  |
Forfeitures, weighted-average grant-date fair value (in dollars per share) | $ / shares | 77.00 |  |  |  |
Unvested, end of period, weighted-average grant-date fair value (in dollars per share) | $ / shares | $ 77.07 | $ 81.19 |  |  |
TSRIs |  |  |  |  |
Certain stock-based incentive amounts |  |  |  |  |
Fair value of shares vested during the year | $ | $ 8 | $ 14 | $ 0 |  |
Stock-Based Awards |  |  |  |  |
Award vesting period | 3 years |  |  |  |
Roll-forward of stock awards other than options and SARS. |  |  |  |  |
Unvested, beginning of period (in shares) | 346,000 |  |  |  |
Granted (in shares) | 473,000 |  |  |  |
Vested (in shares) | (102,000) |  |  |  |
Forfeitures (in shares) | (10,000) |  |  |  |
Unvested, end of period (in shares) | 707,000 | 346,000 |  |  |
Stock awards other than options and SARs, weighted-average grant-date fair value (in dollars per share) |  |  |  |  |
Unvested, beginning of period, weighted-average grant-date fair value (in dollars per share) | $ / shares | $ 83.75 |  |  |  |
Granted, weighted-average grant-date fair value (in dollars per share) | $ / shares | 76.83 |  |  |  |
Vested, weighted-average grant-date fair value (in dollars per share) | $ / shares | 87.27 |  |  |  |
Forfeitures, weighted-average grant-date fair value (in dollars per share) | $ / shares | 76.43 |  |  |  |
Unvested, end of period, weighted-average grant-date fair value (in dollars per share) | $ / shares | $ 78.72 | $ 83.75 |  |  |
Grant-date assumptions used in the Monte Carlo simulation models |  |  |  |  |
Risk-free interest rate (as a percent) | 0.80% | 0.90% | 1.00% |  |
Dividend yield (as a percent) | 3.90% | 4.10% | 2.80% |  |
Volatility factor (as a percent) | 42.00% | 37.00% | 27.00% |  |
Expected life | 3 years | 3 years | 3 years |  |
Grant-date fair value of underlying Occidental common stock (in dollars per share) | $ / shares |  |  | $ 101.95 | $ 76.83 | $ 72.54
TSRIs | Low end of range |  |  |  |  |
Other disclosures |  |  |  |  |
Payouts for Performance-based awards granted (as a percent) | 0.00% | 0.00% | 0.00% |  |
TSRIs | High end of range |  |  |  |  |
Other disclosures |  |  |  |  |
Payouts for Performance-based awards granted (as a percent) | 200.00% | 200.00% | 150.00% |  |
Options |  |  |  |  |
Stock-Based Awards |  |  |  |  |
Awards granted | 0 |  |  |  |
Options and stock-settled SARs |  |  |  |  |
Certain stock-based incentive amounts |  |  |  |  |
Intrinsic value of options and stock-settled SARs exercised (in dollars) | $ | $ 1 | $ 0 | $ 5 |  |
Cash-settled SARs |  |  |  |  |
Certain stock-based incentive amounts |  |  |  |  |
Cash paid | $ |  |  | $ 26 |  |
Stock-Based Awards |  |  |  |  |
Awards granted | 0 | 0 |  |  |
Cash based awards outstanding | 0 | 0 |  | 0 | 0
Option and SAR transactions |  |  |  |  |
Beginning balance (in shares) | 0 |  |  |  |
Ending balance (in shares) | 0 | 0 |  |  |
Options and SARs |  |  |  |  |
Stock-Based Awards |  |  |  |  |
Cash based awards outstanding | 629,000 | 629,000 |  | 571,000 | 629,000
Option and SAR transactions |  |  |  |  |
Beginning balance (in shares) | 629,000 |  |  |  |
Exercised (in shares) | (47,000) |  |  |  |
Forfeitures (in shares) | (11,000) |  |  |  |
Ending balance (in shares) | 571,000 | 629,000 |  |  |
Exercisable, end of period (in shares) |  |  |  | 214,000 |
Option and SAR transactions |  |  |  |  |
Beginning balance, weighted average exercise price (in dollars per share) | $ / shares | $ 77.58 |  |  |  |
Exercised, weighted average exercise price (in dollars per share) | $ / shares | 45.53 |  |  |  |
Forfeitures, weighted average exercise price (in dollars per share) | $ / shares | 79.98 |  |  |  |
Ending balance, weighted average exercise price (in dollars per share) | $ / shares | $ 79.98 | $ 77.58 |  |  |
Exercisable, end of period, weighted average exercise price (in dollars per share) | $ / shares |  |  |  | $ 79.98 |
Ending balance, weighted average remaining contractual term | 5 years 1 month 6 days |  |  |  |
Exercisable, end of period, weighted average remaining contractual term | 5 years 1 month 6 days |  |  |  |
ROCEI/ROAI |  |  |  |  |
Stock-Based Awards |  |  |  |  |
Award vesting period | 3 years |  |  |  |
Roll-forward of stock awards other than options and SARS. |  |  |  |  |
Unvested, beginning of period (in shares) | 392,000 |  |  |  |
Unvested, end of period (in shares) | 392,000 | 392,000 |  |  |
Stock awards other than options and SARs, weighted-average grant-date fair value (in dollars per share) |  |  |  |  |
Unvested, beginning of period, weighted-average grant-date fair value (in dollars per share) | $ / shares | $ 85.43 |  |  |  |
Unvested, end of period, weighted-average grant-date fair value (in dollars per share) | $ / shares | $ 85.43 | $ 85.43 |  |  |
ROCEI/ROAI | Low end of range |  |  |  |  |
Other disclosures |  |  |  |  |
Payouts for Performance-based awards granted (as a percent) | 0.00% |  |  |  |
ROCEI/ROAI | High end of range |  |  |  |  |
Other disclosures |  |  |  |  |
Payouts for Performance-based awards granted (as a percent) | 200.00% |  |  |  |

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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average expected volatility rate of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Net number of non-option equity instruments granted to participants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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