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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Computation of diluted EPS | Computation of Diluted EPS
| Three Months Ended June 30
| 2018 |  | 2017
(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
Basic EPS attributable to Comcast Corporation shareholders | $ | 3,216 |  |  | 4,598 |  |  | $ | 0.70 |  |  | $ | 2,521 |  |  | 4,728 |  |  | $ | 0.53 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Assumed exercise or issuance of shares relating to stock plans |  |  | 45 |  |  |  |  |  |  | 81 |  |  |
Diluted EPS attributable to Comcast Corporation shareholders | $ | 3,216 |  |  | 4,643 |  |  | $ | 0.69 |  |  | $ | 2,521 |  |  | 4,809 |  |  | $ | 0.52 |
| Six Months Ended June 30
| 2018 |  | 2017
(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
Basic EPS attributable to Comcast Corporation shareholders | $ | 6,334 |  |  | 4,616 |  |  | $ | 1.37 |  |  | $ | 5,094 |  |  | 4,738 |  |  | $ | 1.08 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Assumed exercise or issuance of shares relating to stock plans |  |  | 58 |  |  |  |  |  |  | 82 |  |  |
Diluted EPS attributable to Comcast Corporation shareholders | $ | 6,334 |  |  | 4,674 |  |  | $ | 1.36 |  |  | $ | 5,094 |  |  | 4,820 |  |  | $ | 1.06 |

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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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