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COMMON STOCK - Employee and Director Stock Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | May 11, 2017
Option Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Estimated annual forfeiture rate | 6.50% |
The Program |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock available for issuance (in shares) |  | 109,200,000
The Program | Option Awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expiration date | 7 years |
The Program | Option Awards | Low |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 3 years |
The Program | Option Awards | High |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 4 years |
The Program | Restricted stock units | Low |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 3 years |
The Program | Restricted stock units | High |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 5 years |
The Program | MRSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 3 years |
The Program | Restricted stock or restricted stock units | High |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock available for issuance (in shares) |  | 11,200,000
Nonemployee Directors Program |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock available for issuance (in shares) | 2,800,000 |
Nonemployee Directors Program | Annual award to nonemployee director |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Limit on total value of the award | $ 0.2 |
Nonemployee Directors Program | Option Awards | Awards granted in 2012 and later |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 1 year |
Nonemployee Directors Program | Option Awards | High | Annual award to nonemployee director |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock available for issuance (in shares) | 40,000 |
Nonemployee Directors Program | Restricted stock units | High | Annual award to nonemployee director |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock available for issuance (in shares) | 16,000 |
ESPP | ESPP |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock available for issuance (in shares) | 15,300,000 |
Percentage of lower of fair market value of common stock on effective date of subscription or date of purchase | 85.00% |
Maximum percentage of compensation employees can authorize to be withheld for common stock purchases | 12.00% |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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