Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Income Statement [Abstract]
Revenue	$ 29,940	$ 30,313	$ 61,396	$ 60,199
Costs and Expenses:
Programming and production	8,389	7,576	19,273	15,991
Marketing and promotion	2,258	2,168	4,422	4,239
Other operating and administrative	10,445	10,422	20,853	20,314
Depreciation	2,391	2,349	4,724	4,580
Amortization	1,297	1,805	2,829	3,423
Total costs and expenses	24,780	24,320	52,101	48,548
Operating income	5,160	5,992	9,296	11,650
Interest expense	(1,052)	(1,105)	(2,146)	(2,155)
Investment and other income (loss), net	503	9,760	195	9,644
Income before income taxes	4,612	14,647	7,345	19,139
Income tax expense	(1,194)	(3,603)	(1,899)	(4,799)
Net income	3,419	11,044	5,445	14,340
Less: Net income (loss) attributable to noncontrolling interests	(107)	(79)	(254)	(158)
Net income attributable to Comcast Corporation	$ 3,526	$ 11,123	$ 5,699	$ 14,498
Basic earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.99	$ 2.99	$ 1.59	$ 3.87
Diluted earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.99	$ 2.98	$ 1.59	$ 3.86

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
Operating Activities
Net income	$ 5,445	$ 14,340
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,553	8,003
Share-based compensation	786	703
Noncash interest expense (income), net	253	253
Net (gain) loss on investment activity and other	(84)	(9,390)
Deferred income taxes	1,427	2,556
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Current and noncurrent receivables, net	(1,338)	1,023
Film and television costs, net	873	188
Accounts payable and accrued expenses related to trade creditors	958	34
Other operating assets and liabilities	(891)	(1,602)
Net cash provided by operating activities	14,983	16,109
Investing Activities
Capital expenditures	(5,253)	(4,930)
Cash paid for intangible assets	(1,226)	(1,257)
Construction of Universal Beijing Resort	0	(3)
Acquisitions, net of cash acquired	0	(1,279)
Proceeds from sales of businesses and investments	106	659
Purchases of investments	(485)	(1,132)
Other	367	39
Net cash provided by (used in) investing activities	(6,491)	(7,903)
Financing Activities
Proceeds from borrowings	1,990	2,494
Repurchases and repayments of debt	(7,344)	(1,856)
Repurchases of common stock under repurchase program and employee plans	(2,507)	(4,066)
Dividends paid	(2,432)	(2,462)
Cash transferred to Versant, net	(750)	0
Other	(270)	9
Net cash provided by (used in) financing activities	(11,313)	(5,881)
Impact of foreign currency on cash, cash equivalents and restricted cash	(4)	46
Increase (decrease) in cash, cash equivalents and restricted cash	(2,824)	2,371
Cash, cash equivalents and restricted cash, beginning of period	10,559	7,377
Cash, cash equivalents and restricted cash, end of period	$ 7,735	$ 9,748

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Current Assets:
Cash and cash equivalents	$ 7,661	$ 9,481
Receivables, net	13,955	13,869
Other current assets	4,718	6,217
Total current assets	26,335	29,567
Film and television costs	10,467	12,214
Investments	7,828	7,952
Property and equipment, net of accumulated depreciation of $62,017 and $60,754	66,127	65,680
Goodwill	53,070	61,502
Franchise rights	59,365	59,365
Other intangible assets, net of accumulated amortization of $31,818 and $39,362	19,687	22,474
Other noncurrent assets, net	14,669	13,877
Total assets	257,548	272,631
Current Liabilities:
Accounts payable and accrued expenses related to trade creditors	11,864	11,058
Deferred revenue	3,787	4,097
Accrued expenses and other current liabilities	11,325	12,410
Current portion of debt	6,117	5,958
Total current liabilities	33,093	33,524
Noncurrent portion of debt	84,264	92,979
Deferred income taxes	28,940	27,788
Other noncurrent liabilities	21,296	20,965
Commitments and contingencies
Redeemable noncontrolling interests	185	224
Equity:
Preferred stock—authorized, 20,000,000 shares; issued, zero	0	0
Additional paid-in capital	37,680	37,709
Retained earnings	60,298	66,675
Treasury stock, 919,026,355 Class A common shares	(7,517)	(7,517)
Accumulated other comprehensive income (loss)	(743)	(8)
Total Comcast Corporation shareholders’ equity	89,763	96,903
Noncontrolling interests	7	249
Total equity	89,770	97,151
Total liabilities and equity	257,548	272,631
Class A Common Stock
Equity:
Common stock	45	45
Class B Common Stock
Equity:
Common stock	$ 0	$ 0