Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	3 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Comcast [Member]	Jun. 30, 2011 Comcast [Member]	Jun. 30, 2012 CCCL Parent [Member]	Jun. 30, 2011 CCCL Parent [Member]	Jun. 30, 2012 Combined CCHMO Parents [Member]	Jun. 30, 2011 Combined CCHMO Parents [Member]	Jun. 30, 2012 Comcast Holdings [Member]	Jun. 30, 2011 Comcast Holdings [Member]	Jun. 30, 2012 Comcast Non-Guarantor Subsidiaries [Member]	Jun. 30, 2011 Comcast Non-Guarantor Subsidiaries [Member]	Jun. 30, 2012 Elimination and Consolidation Adjustments [Member]	Jun. 30, 2011 Elimination and Consolidation Adjustments [Member]
Operating Activities
Net cash provided by (used in) operating activities	$ 7,815	$ 6,956	$ (194)	$ (291)	$ (100)	$ (4)	$ (71)	$ (66)	$ 6	$ (12)	$ 8,174	$ 7,329	$ 0	$ 0
Investing Activities
Net transactions with affiliates			3,317	1,640	100	1,004	624	66	(6)	32	(4,035)	(2,742)	0	0
Capital expenditures	(2,461)	(2,377)	(4)	(3)	0	0	0	0	0	0	(2,457)	(2,374)	0	0
Cash paid for intangible assets	(414)	(296)	(4)	0	0	0	0	0	0	0	(410)	(296)	0	0
Acquisitions, net of cash acquired	0	(5,660)		0		0		0		0		(5,660)		0
Proceeds from sales of businesses and investments	64	116	0	0	0	0	0	0	0	0	64	116	0	0
Purchases of investments	(108)	(46)	0	0	0	0	0	0	0	0	(108)	(46)	0	0
Other	90	(23)	0	(50)	0	0	0	0	0	0	90	27	0	0
Net cash provided by (used in) investing activities	(2,829)	(8,286)	3,309	1,587	100	1,004	624	66	(6)	32	(6,856)	(10,975)	0	0
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	(554)	741	(1)	747	0	0	0	0	0	0	(553)	(6)	0	0
Proceeds from borrowings			0	0	0	0	0	0	0	0	0	0	0	0
Repurchases and repayments of debt	(1,692)	(1,764)	(1,125)	(750)	0	(1,000)	(553)	0	0	0	(14)	(14)	0	0
Repurchases and retirements of common stock	(1,500)	(1,050)	(1,500)	(1,050)	0	0	0	0	0	0	0	0	0	0
Dividends paid	(741)	(572)	(741)	(572)	0	0	0	0	0	0	0	0	0	0
Issuances of common stock	184	206	184	206	0	0	0	0	0	0	0	0	0	0
Distributions (to) from noncontrolling interests	(233)	(175)	0	77	0	0	0	0	0	0	(233)	(252)	0	0
Other	31	(43)	68	46	0	0	0	0	0	(20)	(37)	(69)	0	0
Net cash provided by (used in) financing activities	(4,505)	(2,657)	(3,115)	(1,296)	0	(1,000)	(553)	0	0	(20)	(837)	(341)	0	0
Increase (decrease) in cash and cash equivalents	481	(3,987)	0	0	0	0	0	0	0	0	481	(3,987)	0	0
Cash and cash equivalents, beginning of period	1,620	5,984
Cash and cash equivalents, end of period	$ 2,101	$ 1,997	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 2,101	$ 1,997	$ 0	$ 0

Net transactions with affiliates.

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