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STOCK OWNERSHIP AND COMPENSATION PLANS (Employee Stock Purchase Plan and Defined Contribution Plans) (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Company's expense for contributions to its defined contribution plans | $ 64 | $ 84 | $ 78
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Amended company match percentage of employee contributions | 5.00% |  |
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of maximum annual wages witheld for the ESPP | 10.00% |  |
Market price of company stock issued at a discount under the ESPP | 95.00% |  |
Number of shares available for award | 9,000 |  |
Shares purchased by eligible employees under ESPP | 225 | 269 | 326

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- Definition Element represents the discounted market value of the Company stock on offering date or purchase date that participants pay for shares. Typically, the participant's per share cost is the lower of the prices on the two dates. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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