Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenue	$ 30,058	$ 29,691
Costs and Expenses:
Programming and production	8,823	9,004
Marketing and promotion	2,018	1,963
Other operating and administrative	9,857	9,301
Depreciation	2,175	2,264
Amortization	1,376	1,513
Total costs and expenses	24,248	24,045
Operating income	5,810	5,646
Interest expense	(1,002)	(1,010)
Investment and other income (loss), net	298	607
Income before income taxes	5,105	5,243
Income tax expense	(1,328)	(1,476)
Net income	3,777	3,767
Less: Net income (loss) attributable to noncontrolling interests	(79)	(67)
Net income attributable to Comcast Corporation	$ 3,857	$ 3,834
Basic earnings (loss) per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.97	$ 0.91
Diluted earnings (loss) per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.97	$ 0.91