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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net Income Attributable to Comcast Corporation	$ 3,553	$ 3,118
Basic EPS attributable to Comcast Corporation shareholders (in shares)	4,534	4,633
Basic earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.78	$ 0.67
Effect of dilutive securities:
Net Income Attributable to Comcast Corporation	$ 3,553	$ 3,118
Assumed exercise or issuance of shares relating to stock plans (in shares)	60	72
Diluted EPS attributable to Comcast Corporation shareholders (in shares)	4,594	4,705
Diluted earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.77	$ 0.66

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