XML 41 R28.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Summary of Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Summary of Significant Accounting Policies [Abstract] |
Valuation of Option Grants under Stock Option Plans |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ | 2018 |  | 2017 |  | 2016
﻿Expected volatility | 30.6 |  | - |  | 31.4 | % |  | 32.4 |  | - |  | 36.1 | % |  | 37.1 |  | - |  | 43.1 | %
﻿Weighted-average volatility | 31.4% |  | 36.1% |  | 41.0%
﻿Expected dividends | 2.22 |  | - |  | 2.66 | % |  | 1.98 |  | - |  | 2.28 | % |  | 2.28 |  | - |  | 2.94 | %
﻿Risk-free rate | 2.7 |  | - |  | 3.1 | % |  | 2.1 |  | - |  | 2.3 | % |  | 1.4 |  | - |  | 2.1 | %
﻿Expected term (in years) | 7.4 |  | - |  | 7.4 |  |  | 7.4 |  | - |  | 7.4 |  |  | 7.4 |  | - |  | 7.4 |
﻿Pre-vesting departure rate | 0.6 |  | - |  | 0.6 | % |  | 0.6 |  | - |  | 0.6 | % |  | 0.6 |  | - |  | 0.6 | %
﻿
Supplemental Disclosure of Cash Flow Information |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ | Years ended December 31,
﻿ | 2018 |  | 2017 |  | 2016
﻿Non-cash transactions: |  |  |  |  |  |  |  |
﻿Accruals for capital expenditures | $ | 412 |  | $ | 584 |  | $ | 381
﻿Cash paid for interest and income taxes: |  |  |  |  |  |  |  |
﻿Interest (1) | $ | 205 |  | $ | 178 |  | $ | 184
﻿Income taxes, net of refunds received | $ | 567 |  | $ | 405 |  | $ | 293
﻿
| (1) |  | Included in this amount are approximately $49 million, $36 million, and $23 million of interest costs that were capitalized as part of property, plant and equipment, net of accumulated depreciation, in 201 8, 201 7 and 201 6, respectively.
Useful Life of Equipment |
﻿ |
﻿ |
﻿Asset type | Range of useful life
﻿ |
﻿Computer hardware and software | 3 to 7 years
﻿Manufacturing equipment | 2 to 15 years
﻿Furniture and fixtures | 5 to 10 years
﻿Transportation equipment | 3 to 20 years
﻿

X
- Definition Property plant and equipment estimated useful lives [table text block] + References No definition available. + Details
Name: | glw_PropertyPlantAndEquipmentEstimatedUsefulLivesTableTextBlock
Namespace Prefix: | glw_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration