Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Income Statement [Abstract]
Revenue	$ 29,887	$ 30,058
Costs and Expenses:
Programming and production	8,415	8,823
Marketing and promotion	2,071	2,018
Other operating and administrative	9,893	9,857
Depreciation	2,231	2,175
Amortization	1,618	1,376
Total costs and expenses	24,228	24,248
Operating income	5,658	5,810
Interest expense	(1,050)	(1,002)
Investment and other income (loss), net	(116)	298
Income before income taxes	4,492	5,105
Income tax expense	(1,196)	(1,328)
Net income	3,296	3,777
Less: Net income (loss) attributable to noncontrolling interests	(79)	(79)
Net income attributable to Comcast Corporation	$ 3,375	$ 3,857
Basic earnings (loss) per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.90	$ 0.97
Diluted earnings (loss) per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.89	$ 0.97

Other operating and administrative expense recognized in the period not presented separately.

No definition available.

Name:	cmcsa_OtherOperatingAndAdministrative
Namespace Prefix:	cmcsa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of expense recognized in the period for costs associated with video programming and content acquisition and production costs. Programming expenses include the fees paid to license the programming distributed to video customers, such as the programming license fees charged by cable networks and fees charged for retransmission of the signals from local broadcast television stations. Production costs include the amortization of owned and acquired programming, sports rights, direct production costs, residual and participation payments, production overhead, costs associated with the distribution of programming to third-party networks and other distribution platforms, and on-air talent costs. It also includes the amortization of capitalized theatrical film production and acquisition costs and distribution expenses.

+ References

No definition available.