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Quarterly Operating Results | 12 Months Ended
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Dec. 31, 2018
Quarterly Operating Results [Abstract] |
Quarterly Operating Results | Quarterly Opera ting Results (unaudited) ﻿ (In millions, except per share amounts) ﻿ ﻿
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﻿2018 | First quarter |  | Second quarter |  | Third quarter |  | Fourth quarter |  | Total year
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﻿Net sales | $ | 2,500 |  | $ | 2,747 |  | $ | 3,008 |  | $ | 3,035 |  | $ | 11,290
﻿Gross margin | $ | 955 |  | $ | 1,072 |  | $ | 1,232 |  | $ | 1,202 |  | $ | 4,461
﻿Equity in earnings of affiliated companies | $ | 39 |  | $ | 31 |  | $ | 32 |  | $ | 288 |  | $ | 390
﻿Provision for income taxes | $ | (124) |  | $ | (126) |  | $ | (133) |  | $ | (54) |  | $ | (437)
﻿Net (loss) income attributable to Corning Incorporated | $ | (589) |  | $ | 738 |  | $ | 625 |  | $ | 292 |  | $ | 1,066
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﻿Basic (loss) earnings per common share | $ | (0.72) |  | $ | 0.87 |  | $ | 0.75 |  | $ | 0.27 |  | $ | 1.19
﻿Diluted (loss) earnings per common share | $ | (0.72) |  | $ | 0.78 |  | $ | 0.67 |  | $ | 0.26 |  | $ | 1.13
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﻿2017 | First quarter |  | Second quarter |  | Third quarter |  | Fourth quarter |  | Total year
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﻿Net sales | $ | 2,375 |  | $ | 2,497 |  | $ | 2,607 |  | $ | 2,637 |  | $ | 10,116
﻿Gross margin | $ | 951 |  | $ | 987 |  | $ | 1,050 |  | $ | 1,032 |  | $ | 4,020
﻿Equity in earnings of affiliated companies | $ | 80 |  | $ | 37 |  | $ | 31 |  | $ | 213 |  | $ | 361
﻿Benefit (provision) for income taxes (1) | $ | 66 |  | $ | (153) |  | $ | (89) |  | $ | (1,978) |  | $ | (2,154)
﻿Net income (loss) attributable to Corning Incorporated | $ | 86 |  | $ | 439 |  | $ | 390 |  | $ | (1,412) |  | $ | (497)
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﻿Basic earnings (loss) per common share | $ | 0.07 |  | $ | 0.46 |  | $ | 0.41 |  | $ | (1.66) |  | $ | (0.66)
﻿Diluted earnings (loss) per common share | $ | 0.07 |  | $ | 0.42 |  | $ | 0.39 |  | $ | (1.66) |  | $ | (0.66)
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| (1) |  | In December 2017, the U.S. enacted the 2017 Tax Act which resulted in significant changes to our provision for income taxes during the fourth quarter of 2017. Refer t o Note 4 (Income Taxes) to the Consolidated F inancial S tatements for additional information.
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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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