Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Revenue	$ 32,070	$ 30,115	$ 91,817	$ 90,319
Costs and Expenses:
Programming and production	10,216	8,652	27,000	26,506
Marketing and promotion	1,989	1,866	5,929	5,929
Other operating and administrative	10,128	9,629	29,615	28,247
Depreciation	2,219	2,203	6,548	6,662
Amortization	1,659	1,290	4,421	4,146
Total costs and expenses	26,211	23,640	73,512	71,489
Operating income	5,859	6,475	18,304	18,830
Interest expense	(1,037)	(1,060)	(3,065)	(3,068)
Investment and other income (loss), net	(3)	50	(140)	672
Income before income taxes	4,819	5,465	15,099	16,434
Income tax expense	(1,243)	(1,468)	(3,906)	(4,481)
Net income	3,576	3,997	11,192	11,954
Less: Net income (loss) attributable to noncontrolling interests	(53)	(49)	(222)	(175)
Net income attributable to Comcast Corporation	$ 3,629	$ 4,046	$ 11,415	$ 12,128
Basic earnings (loss) per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.94	$ 0.98	$ 2.92	$ 2.92
Diluted earnings (loss) per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.94	$ 0.98	$ 2.90	$ 2.90

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.