Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Computation of diluted EPS

Computation of Diluted EPS

	Three Months Ended June 30
	2017					2016
(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	$	2,513	4,728	$	0.53	$	2,028	4,839	$	0.42
Effect of dilutive securities:
Assumed exercise or issuance of shares relating to stock plans			81					52
Diluted EPS attributable to Comcast Corporation shareholders	$	2,513	4,809	$	0.52	$	2,028	4,891	$	0.41

	Six Months Ended June 30
	2017					2016
(in millions, except per share amounts)	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	$	5,079	4,738	$	1.07	$	4,162	4,853	$	0.86
Effect of dilutive securities:
Assumed exercise or issuance of shares relating to stock plans			82					55
Diluted EPS attributable to Comcast Corporation shareholders	$	5,079	4,820	$	1.05	$	4,162	4,908	$	0.85