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Quarterly Operating Results (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Operating Results [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 3,035 | $ 3,008 | $ 2,747 | $ 2,500 | $ 2,637 |  | $ 2,607 |  | $ 2,497 |  | $ 2,375 |  | $ 11,290 | $ 10,116 |  | $ 9,390
Gross margin | 1,202 | 1,232 | 1,072 | 955 | 1,032 |  | 1,050 |  | 987 |  | 951 |  | 4,461 | 4,020 |  | 3,763
Equity in earnings of affiliated companies | 288 | 32 | 31 | 39 | 213 |  | 31 |  | 37 |  | 80 |  | 390 | 361 |  | 284
Provision for income taxes | (54) | (133) | (126) | (124) | (1,978) | [1] | (89) | [1] | (153) | [1] | 66 | [1] | (437) | (2,154) | [1] | 3
Net income (loss) attributable to Corning Incorporated | $ 292 | $ 625 | $ 738 | $ (589) | $ (1,412) |  | $ 390 |  | $ 439 |  | $ 86 |  | $ 1,066 | $ (497) |  | $ 3,695
Basic earnings (loss) per common share (in dollars per share) | $ 0.27 | $ 0.75 | $ 0.87 | $ (0.72) | $ (1.66) |  | $ 0.41 |  | $ 0.46 |  | $ 0.07 |  | $ 1.19 | $ (0.66) |  | $ 3.53
Diluted earnings (loss) per common share (in dollars per share) | $ 0.26 | $ 0.67 | $ 0.78 | $ (0.72) | $ (1.66) |  | $ 0.39 |  | $ 0.42 |  | $ 0.07 |  | $ 1.13 | $ (0.66) |  | $ 3.23
[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 to Note 4 (Income Taxes) to the Consolidated Financial Statements for additional information.

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