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STOCK-BASED INCENTIVE PLANS (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2020 | Apr. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-Based Payment Award |  |  |  |  |
Aggregate number of shares authorized for issuance (in shares) |  |  | 133,000,000 |  |
Number of shares awarded to date (in shares) |  |  | 11,600,000 |  |
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 |  |  | $ 202 | $ 208 | $ 180
Income tax benefit recognized in the income statement |  |  | 42 | $ 43 | $ 47
Unrecognized compensation expense |  |  | $ 254 |  |
Weighted-average period over which unrecognized compensation expense is expected to be recognized |  |  | 1 year 8 months 12 days |  |
Stock awards other than options and SARs, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  |  |  |
Issued (in shares) | 11,600,000 | 17,300,000 | 36,130,000 | 3,188,000 | 1,628,000
Stock options, grant date fair value (in dollars per share) |  |  | $ 3.19 |  |
Vested |  |  |  |  |
Outstanding stock options |  |  |  |  |
Stock options, number of shares outstanding, beginning balance (in shares) |  |  | 530,000 |  |
Granted (in shares) |  |  | 0 |  |
Anti-dilution adjustment (in shares) |  |  | 21,000 |  |
Vested (in shares) |  |  | 0 |  |
Expirations and forfeitures (in shares) |  |  | 0 |  |
Stock options, number of shares outstanding, ending balance (in shares) |  |  | 551,000 | 530,000 |
Options, weighted average strike price |  |  |  |  |
Stock options, weighted average strike price, beginning balance (in dollars per share) |  |  | $ 79.98 |  |
Stock options, anti-dilution adjustment, weighted average strike price (in dollars per share) |  |  | 76.96 |  |
Stock options, weighted average strike price, ending balance (in dollars per share) |  |  | $ 76.96 | $ 79.98 |
Unvested |  |  |  |  |
Outstanding stock options |  |  |  |  |
Stock options, number of shares outstanding, beginning balance (in shares) |  |  | 0 |  |
Granted (in shares) |  |  | 2,573,000 |  |
Anti-dilution adjustment (in shares) |  |  | 101,000 |  |
Vested (in shares) |  |  | 0 |  |
Expirations and forfeitures (in shares) |  |  | 0 |  |
Stock options, number of shares outstanding, ending balance (in shares) |  |  | 2,674,000 | 0 |
Options, weighted average strike price |  |  |  |  |
Stock options, granted, weighted average strike price (in dollars per share) |  |  | $ 41.60 |  |
Stock options, anti-dilution adjustment, weighted average strike price (in dollars per share) |  |  | 40.03 |  |
Stock options, weighted average strike price, ending balance (in dollars per share) |  |  | $ 40.03 |  |
Anadarko Petroleum Corporation |  |  |  |  |
Certain stock-based incentive amounts |  |  |  |  |
Compensation expense |  |  | $ 59 | $ 31 |
High end of range |  |  |  |  |
Share-based Compensation Arrangement by Share-Based Payment Award |  |  |  |  |
Maximum shares available for future issuance (in shares) |  |  | 88,300,000 |  |
Common Stock | Non-employee directors |  |  |  |  |
Share-based Compensation Arrangement by Share-Based Payment Award |  |  |  |  |
Restricted stock granted to non-employee directors (in shares) |  |  | 144,603 |  |
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 |  |  | $ 3 | $ 4 | $ 18
Roll-forward of stock awards other than options and SARS. |  |  |  |  |
Unvested, beginning of period (in shares) |  |  | 4,347,000 |  |
Granted (in shares) |  |  | 1,500,000 |  |
Vested (in shares) |  |  | (114,000) |  |
Forfeitures (in shares) |  |  | (276,000) |  |
Unvested, end of period (in shares) |  |  | 5,457,000 | 4,347,000 |
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) |  |  | $ 43.46 |  |
Granted, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | 40.86 | $ 42.62 | $ 75.86
Vested, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | 61.61 |  |
Forfeitures, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | 42.68 |  |
Unvested, end of period, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | $ 42.41 | $ 43.46 |
Vested (in shares) |  |  | 114,000 |  |
Stock-Settled RSUs |  |  |  |  |
Certain stock-based incentive amounts |  |  |  |  |
Fair value of shares vested during the year |  |  | $ 62 | $ 148 | $ 109
Roll-forward of stock awards other than options and SARS. |  |  |  |  |
Unvested, beginning of period (in shares) |  |  | 4,395,000 |  |
Granted (in shares) |  |  | 4,299,000 |  |
Vested (in shares) |  |  | (2,328,000) |  |
Forfeitures (in shares) |  |  | (510,000) |  |
Unvested, end of period (in shares) |  |  | 5,856,000 | 4,395,000 |
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) |  |  | $ 65.88 |  |
Granted, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | 41.60 | $ 58.73 | $ 69.87
Vested, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | 64.19 |  |
Forfeitures, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | 48.89 |  |
Unvested, end of period, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | $ 50.21 | $ 65.88 |
Vested (in shares) |  |  | 2,328,000 |  |
TSRIs |  |  |  |  |
Certain stock-based incentive amounts |  |  |  |  |
Award vesting period |  |  | 3 years |  |
Fair value of shares vested during the year |  |  | $ 9 | $ 4 | $ 12
Grant-date assumptions used in the Monte Carlo simulation models |  |  |  |  |
Risk-free interest rate (as a percent) |  |  | 1.40% | 2.50% | 2.30%
Volatility factor (as a percent) |  |  | 26.00% | 22.00% | 24.00%
Expected life (years) |  |  | 3 years | 3 years | 3 years
Grant-date fair value of underlying Occidental common stock (in dollars per share) |  |  | $ 41.60 | $ 67.19 | $ 69.87
Roll-forward of stock awards other than options and SARS. |  |  |  |  |
Unvested, beginning of period (in shares) |  |  | 1,537,000 |  |
Granted (in shares) |  |  | 641,000 |  |
Vested (in shares) |  |  | (563,000) |  |
Forfeitures (in shares) |  |  | (81,000) |  |
Unvested, end of period (in shares) |  |  | 1,534,000 | 1,537,000 |
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) |  |  | $ 67.70 |  |
Granted, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | 41.60 |  |
Vested, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | 67.21 |  |
Forfeitures, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | 52.47 |  |
Unvested, end of period, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | $ 58.02 | $ 67.70 |
Payouts for performance-based awards granted (as a percent) |  |  | 40.00% |  |
Issued (in shares) |  |  | 223,000 |  |
Vested (in shares) |  |  | 563,000 |  |
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 |  |  |  |  |
Certain stock-based incentive amounts |  |  |  |  |
Award vesting period |  |  | 3 years |  |
Grant-date assumptions used in the Monte Carlo simulation models |  |  |  |  |
Risk-free interest rate (as a percent) |  |  | 1.50% |  |
Volatility factor (as a percent) |  |  | 25.00% |  |
Expected life (years) |  |  | 6 years |  |
Dividend yield |  |  | 7.60% |  |
Grant-date fair value of underlying Occidental common stock (in dollars per share) |  |  | $ 41.60 |  |
Option and SAR transactions |  |  |  |  |
Options, weighted average strike price |  |  |  |  |
Remaining life of options |  |  | 1 year 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) |  |  | 154,000 |  |
Granted (in shares) |  |  | 197,000 |  |
Vested (in shares) |  |  | (154,000) |  |
Forfeitures (in shares) |  |  | 0 |  |
Unvested, end of period (in shares) |  |  | 197,000 | 154,000 |
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) |  |  | $ 68.44 |  |
Granted, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | 41.60 |  |
Vested, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | 68.47 |  |
Forfeitures, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  |  |  |
Unvested, end of period, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  | $ 41.60 | $ 68.44 |
Vested (in shares) |  |  | 154,000 |  |
ROCEI/ROAI | 52% of the target |  |  |  |  |
Roll-forward of stock awards other than options and SARS. |  |  |  |  |
Vested (in shares) |  |  | (89,700) |  |
Stock awards other than options and SARs, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  |  |  |
Payout at vesting percentage |  |  | 58.00% |  |
Vested (in shares) |  |  | 89,700 |  |
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 Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit 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 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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