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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net Income Attributable to Comcast Corporation	$ 3,216	$ 2,521	$ 6,334	$ 5,094
Basic EPS attributable to Comcast Corporation shareholders (in shares)	4,598	4,728	4,616	4,738
Basic earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.70	$ 0.53	$ 1.37	$ 1.08
Effect of dilutive securities:
Net Income Attributable to Comcast Corporation	$ 3,216	$ 2,521	$ 6,334	$ 5,094
Assumed exercise or issuance of shares relating to stock plans (in shares)	45	81	58	82
Diluted EPS attributable to Comcast Corporation shareholders (in shares)	4,643	4,809	4,674	4,820
Diluted earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.69	$ 0.52	$ 1.36	$ 1.06

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