Noncontrolling Interests (Tables)

3 Months Ended

Mar. 31, 2013

Noncontrolling Interests [Abstract]

Schedule Summarizing Changes in Equity Resulting from Net Income Attributable to Parent and Transfers to or from Noncontrolling Interests

Changes in Equity
			Three Months Ended
			March 31
(in millions)			2013		2012
Net income attributable to Comcast Corporation			$	1,437	$	1,224
Transfers from (to) noncontrolling interests:
	Decrease in Comcast Corporation additional paid-in capital resulting from the
		purchase of GE's redeemable noncontrolling common equity interest		(1,482)		-
	Other			(1)		2
Changes in equity resulting from net income attributable to Comcast Corporation
	and transfers from (to) noncontrolling interests		$	(46)	$	1,226