Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenue	$ 30,513	$ 30,016	$ 60,205	$ 61,026
Costs and Expenses:
Programming and production	8,849	8,887	17,853	19,457
Marketing and promotion	2,100	2,196	4,063	4,258
Other operating and administrative	9,317	9,098	18,618	18,358
Depreciation	2,195	2,162	4,459	4,375
Amortization	1,343	1,306	2,856	2,641
Total costs and expenses	23,804	23,649	47,849	49,089
Operating income	6,709	6,367	12,355	11,936
Interest expense	(998)	(968)	(2,007)	(1,962)
Investment and other income (loss), net	15	(897)	622	(709)
Income before income taxes	5,726	4,502	10,970	9,266
Income tax expense	(1,537)	(1,261)	(3,013)	(2,548)
Net income	4,189	3,241	7,957	6,717
Less: Net income (loss) attributable to noncontrolling interests	(59)	(155)	(126)	(227)
Net income attributable to Comcast Corporation	$ 4,248	$ 3,396	$ 8,082	$ 6,945
Basic earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 1.02	$ 0.76	$ 1.93	$ 1.55
Diluted earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 1.02	$ 0.76	$ 1.92	$ 1.54