Condensed Consolidated Statement of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue	$ 26,859	$ 22,791
Costs and Expenses:
Programming and production	8,569	7,429
Other operating and administrative	7,900	6,514
Advertising, marketing and promotion	1,888	1,604
Depreciation	2,240	2,011
Amortization	1,080	588
Total costs and expenses	21,677	18,146
Operating income	5,182	4,645
Interest expense	(1,150)	(777)
Investment and other income (loss), net	676	126
Income before income taxes	4,708	3,994
Income tax expense	(1,076)	(818)
Net income	3,632	3,176
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock	79	58
Net income attributable to Comcast Corporation	$ 3,553	$ 3,118
Basic earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.78	$ 0.67
Diluted earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.77	$ 0.66
NBCUniversal Media LLC [Member]
Revenue	$ 8,345	$ 9,530
Costs and Expenses:
Programming and production	3,434	4,573
Other operating and administrative	1,882	1,972
Advertising, marketing and promotion	682	700
Depreciation	243	242
Amortization	272	268
Total costs and expenses	6,513	7,755
Operating income	1,832	1,775
Interest expense	(131)	(127)
Investment and other income (loss), net	240	(4)
Income before income taxes	1,941	1,644
Income tax expense	(103)	(91)
Net income	1,838	1,553
Less: Net income attributable to noncontrolling interests	54	40
Net income attributable to Comcast Corporation	$ 1,784	$ 1,513