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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Computation of diluted EPS |
Computation of Diluted EPS |  |  |  |  |  |  |  |  |
| 2019 | 2018 | 2017
Year ended December 31 (in millions, except per share data) | Net Income Attributable to Comcast Corporation |  | Shares |  | Per Share Amount |  | Net Income Attributable to Comcast Corporation |  | Shares |  | Per Share Amount |  | Net Income Attributable to Comcast Corporation |  | Shares |  | Per Share Amount |
Basic EPS attributable to Comcast Corporation shareholders | $ | 13,057 |  | 4,548 |  | $ | 2.87 |  | $ | 11,731 |  | 4,584 |  | $ | 2.56 |  | $ | 22,735 |  | 4,708 |  | $ | 4.83 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |
Assumed exercise or issuance of shares relating to stock plans |  | 62 |  |  |  | 56 |  |  |  | 78 |  |
Diluted EPS attributable to Comcast Corporation shareholders | $ | 13,057 |  | 4,610 |  | $ | 2.83 |  | $ | 11,731 |  | 4,640 |  | $ | 2.53 |  | $ | 22,735 |  | 4,786 |  | $ | 4.75 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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