Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 15,877	$ 15,107	$ 4,925
Other comprehensive income (loss), net of tax (expense) benefit:
Currency translation adjustments, net of deferred taxes of $(137), $(29) and $310	(895)	1,478	(4,242)
Cash flow hedges:
Deferred gains (losses), net of deferred taxes of $(4), $8 and $(18)	57	16	281
Realized (gains) losses reclassified to net income, net of deferred taxes of $(1), $38 and $(3)	(1)	(158)	(192)
Employee benefit obligations and other, net of deferred taxes of $(9), $(2) and $(11)	31	3	33
Other comprehensive income (loss)	(807)	1,338	(4,120)
Comprehensive income (loss)	15,070	16,445	805
Less: Net income (loss) attributable to noncontrolling interests	(315)	(282)	(445)
Less: Other comprehensive income (loss) attributable to noncontrolling interests	(17)	(19)	(29)
Comprehensive income attributable to Comcast Corporation	$ 15,402	$ 16,746	$ 1,280