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STOCK-BASED INCENTIVE PLANS (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-Based Payment Award |  |  |
Aggregate number of shares authorized for issuance (in shares) | 80,000,000 |  |
Number of shares awarded to date (in shares) | 6,600,000 |  |
Number of shares counted for each share covered by an award in determining the number of shares that are available for future awards | 3 |  |
Certain stock-based incentive amounts |  |  |
Compensation expense | $ 208.0 | $ 180.0 | $ 150.0
Income tax benefit recognized in the income statement | 43.0 | $ 47.0 | $ 32.0
Unrecognized compensation expense | $ 354.1 |  |
Weighted-average period over which unrecognized compensation expense is expected to be recognized | 1 year 10 months 24 days |  |
Stock awards other than options and SARs, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  |
Issued (in shares) | 3,188,000 | 1,628,000 | 1,252,000
Anadarko Petroleum Corporation |  |  |
Certain stock-based incentive amounts |  |  |
Compensation expense | $ 31.0 |  |
High end of range |  |  |
Share-based Compensation Arrangement by Share-Based Payment Award |  |  |
Maximum shares available for future issuance (in shares) | 52,500,000 |  |
Common Stock | Non-employee directors |  |  |
Share-based Compensation Arrangement by Share-Based Payment Award |  |  |
Restricted stock granted to non-employee directors (in shares) | 41,752 |  |
RSUs |  |  |
Stock-Based Awards |  |  |
Forfeiture of RSUs | 7 years |  |
RSUs | Low end of range |  |  |
Certain stock-based incentive amounts |  |  |
Award vesting period | 1 year |  |
RSUs | High end of range |  |  |
Certain stock-based incentive amounts |  |  |
Award vesting period | 4 years |  |
Cash-Settled RSUs |  |  |
Certain stock-based incentive amounts |  |  |
Cash paid | $ 4.0 | $ 18.0 | $ 23.0
Roll-forward of stock awards other than options and SARS. |  |  |
Unvested, beginning of period (in shares) | 186,000 |  |
Granted (in shares) | 4,267,000 |  |
Vested (in shares) | (67,000) |  |
Forfeitures (in shares) | (39,000) |  |
Unvested, end of period (in shares) | 4,347,000 | 186,000 |
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) | $ 73.93 |  |
Granted, Weighted-Average Grant-Date Fair Value (in dollars per share) | 42.62 | $ 75.86 | $ 66.62
Vested, Weighted-Average Grant-Date Fair Value (in dollars per share) | 72.26 |  |
Forfeitures, Weighted-Average Grant-Date Fair Value (in dollars per share) | 47.60 |  |
Unvested, end of period, Weighted-Average Grant-Date Fair Value (in dollars per share) | $ 43.46 | $ 73.93 |
Shares issued in exchange for Anadarko stock based incentive shares (in shares) | 1,500,000 |  |
Vested (in shares) | 67,000 |  |
Stock-Settled RSUs |  |  |
Certain stock-based incentive amounts |  |  |
Fair value of shares vested during the year | $ 148.0 | $ 109.0 | $ 64.0
Roll-forward of stock awards other than options and SARS. |  |  |
Unvested, beginning of period (in shares) | 3,971,000 |  |
Granted (in shares) | 3,543,000 |  |
Vested (in shares) | (2,743,000) |  |
Forfeitures (in shares) | (376,000) |  |
Unvested, end of period (in shares) | 4,395,000 | 3,971,000 |
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) | $ 73.19 |  |
Granted, Weighted-Average Grant-Date Fair Value (in dollars per share) | 58.73 | $ 69.87 | $ 67.21
Vested, Weighted-Average Grant-Date Fair Value (in dollars per share) | 67.04 |  |
Forfeitures, Weighted-Average Grant-Date Fair Value (in dollars per share) | 67.25 |  |
Unvested, end of period, Weighted-Average Grant-Date Fair Value (in dollars per share) | $ 65.88 | $ 73.19 |
Vested (in shares) | 2,743,000 |  |
TSRIs |  |  |
Certain stock-based incentive amounts |  |  |
Award vesting period | 3 years |  |
Fair value of shares vested during the year | $ 4.0 | $ 12.0 | $ 5.0
Grant-date assumptions used in the Monte Carlo simulation models |  |  |
Risk-free interest rate (as a percent) | 2.50% | 2.30% | 1.50%
Volatility factor (as a percent) | 22.00% | 24.00% | 25.00%
Expected life (years) | 3 years | 3 years | 3 years
Grant-date fair value of underlying Occidental common stock (in dollars per share) | $ 67.19 | $ 69.87 | $ 67.21
Roll-forward of stock awards other than options and SARS. |  |  |
Unvested, beginning of period (in shares) | 1,444,000 |  |
Granted (in shares) | 578,000 |  |
Vested (in shares) | (442,000) |  |
Forfeitures (in shares) | (43,000) |  |
Unvested, end of period (in shares) | 1,537,000 | 1,444,000 |
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) | $ 70.97 |  |
Granted, Weighted-Average Grant-Date Fair Value (in dollars per share) | 67.19 |  |
Vested, Weighted-Average Grant-Date Fair Value (in dollars per share) | 76.83 |  |
Forfeitures, Weighted-Average Grant-Date Fair Value (in dollars per share) | 76.83 |  |
Unvested, end of period, Weighted-Average Grant-Date Fair Value (in dollars per share) | $ 67.70 | $ 70.97 |
Payouts for performance-based awards granted (as a percent) | 19.00% |  |
Issued (in shares) | 83,000 |  |
Vested (in shares) | 442,000 |  |
TSRIs | Low end of range |  |  |
Stock awards other than options and SARs, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  |
Payouts for performance-based awards granted (as a percent) | 0.00% |  |
TSRIs | High end of range |  |  |
Stock awards other than options and SARs, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  |
Payouts for performance-based awards granted (as a percent) | 200.00% |  |
Options |  |  |
Stock-Based Awards |  |  |
Awards granted (in shares) | 0 |  |
Awards vested (in shares) | 0 |  |
Awards forfeited (in shares) | 0 |  |
Option and SAR transactions |  |  |
Option and SAR transactions |  |  |
Fully vested options (in shares) | 530,000 |  |
Exercise price (in dollars per share) | $ 79.98 |  |
Remaining life of options | 2 years 1 month 6 days |  |
ROCEI/ROAI |  |  |
Certain stock-based incentive amounts |  |  |
Award vesting period | 3 years |  |
Roll-forward of stock awards other than options and SARS. |  |  |
Unvested, beginning of period (in shares) | 210,000 |  |
Granted (in shares) | 81,000 |  |
Vested (in shares) | (137,000) |  |
Forfeitures (in shares) | 0 |  |
Unvested, end of period (in shares) | 154,000 | 210,000 |
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) | $ 71.60 |  |
Granted, Weighted-Average Grant-Date Fair Value (in dollars per share) | 67.19 |  |
Vested, Weighted-Average Grant-Date Fair Value (in dollars per share) | 72.54 |  |
Forfeitures, Weighted-Average Grant-Date Fair Value (in dollars per share) | 0 |  |
Unvested, end of period, Weighted-Average Grant-Date Fair Value (in dollars per share) | $ 68.44 | $ 71.60 |
Vested (in shares) | 137,000 |  |
ROCEI/ROAI | 52% of the target |  |  |
Roll-forward of stock awards other than options and SARS. |  |  |
Vested (in shares) | (118,000) |  |
Stock awards other than options and SARs, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  |
Payout at vesting percentage | 86.00% |  |
Vested (in shares) | 118,000 |  |
ROCEI/ROAI | Low end of range |  |  |
Stock awards other than options and SARs, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  |
Payouts for performance-based awards granted (as a percent) | 0.00% |  |
ROCEI/ROAI | High end of range |  |  |
Stock awards other than options and SARs, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  |
Payouts for performance-based awards granted (as a percent) | 200.00% |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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