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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial information |
(in millions, except per share data) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total Year |
2019 |  |  |  |  |
Revenue | $ | 26,859 |  | $ | 26,858 |  | $ | 26,827 |  | $ | 28,398 |  | $ | 108,942 |
Operating income | $ | 5,182 |  | $ | 5,356 |  | $ | 5,340 |  | $ | 5,247 |  | $ | 21,125 |
Net income attributable to Comcast Corporation | $ | 3,553 |  | $ | 3,125 |  | $ | 3,217 |  | $ | 3,162 |  | $ | 13,057 |
Basic earnings per common share attributable to Comcast Corporation shareholders | $ | 0.78 |  | $ | 0.69 |  | $ | 0.71 |  | $ | 0.69 |  | $ | 2.87 |
Diluted earnings per common share attributable to Comcast Corporation shareholders | $ | 0.77 |  | $ | 0.68 |  | $ | 0.70 |  | $ | 0.68 |  | $ | 2.83 |
Dividends declared per common share | $ | 0.21 |  | $ | 0.21 |  | $ | 0.21 |  | $ | 0.21 |  | $ | 0.84 |
2018(a) |  |  |  |  |
Revenue | $ | 22,791 |  | $ | 21,735 |  | $ | 22,135 |  | $ | 27,846 |  | $ | 94,507 |
Operating income | $ | 4,645 |  | $ | 5,014 |  | $ | 4,836 |  | $ | 4,514 |  | $ | 19,009 |
Net income attributable to Comcast Corporation | $ | 3,118 |  | $ | 3,216 |  | $ | 2,886 |  | $ | 2,511 |  | $ | 11,731 |
Basic earnings per common share attributable to Comcast Corporation shareholders | $ | 0.67 |  | $ | 0.70 |  | $ | 0.63 |  | $ | 0.55 |  | $ | 2.56 |
Diluted earnings per common share attributable to Comcast Corporation shareholders | $ | 0.66 |  | $ | 0.69 |  | $ | 0.62 |  | $ | 0.55 |  | $ | 2.53 |
Dividends declared per common share | $ | 0.19 |  | $ | 0.19 |  | $ | 0.19 |  | $ | 0.19 |  | $ | 0.76 |
Minor differences may exist due to rounding. (a) The 2018 amounts include the operations of Sky from October 9, 2018 through December 31, 2018. See Note 8 for additional information.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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