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Earnings Per Share | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Computation of Diluted EPS
| Three Months Ended March 31
| 2019 |  | 2018
(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 | $ | 3,553 |  |  | 4,534 |  |  | $ | 0.78 |  |  | $ | 3,118 |  |  | 4,633 |  |  | $ | 0.67 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Assumed exercise or issuance of shares relating to stock plans |  |  | 60 |  |  |  |  |  |  | 72 |  |  |
Diluted EPS attributable to Comcast Corporation shareholders | $ | 3,553 |  |  | 4,594 |  |  | $ | 0.77 |  |  | $ | 3,118 |  |  | 4,705 |  |  | $ | 0.66 |
Diluted earnings per common share attributable to Comcast Corporation shareholders (“diluted EPS”) considers the impact of potentially dilutive securities using the treasury stock method. Our potentially dilutive securities include potential common shares related to our stock options and our restricted share units (“RSUs”). Diluted EPS excludes the impact of potential common shares related to our stock options in periods in which the combination of the option exercise price and the associated unrecognized compensation expense is greater than the average market price of our common stock. The amount of potential common shares related to our share-based compensation plans that were excluded from diluted EPS because their effect would have been antidilutive was not material for the three months ended March 31, 2019 or 2018.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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