Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statement of Comprehensive Income
Net income	$ 1,447	$ 1,039
Unrealized gains (losses) on marketable securities, net of deferred taxes of $- and $(3)	0	5
Deferred gains (losses) on cash flow hedges, net of deferred taxes of $(11) and $(6)	20	11
Realized (gains) losses on marketable securities, net of deferred taxes of $- and $4	0	(7)
Realized (gains) losses on cash flow hedges, net of deferred taxes of $9 and $7	(16)	(12)
Employee benefit obligations, net of deferred taxes of $- and $(2)	(2)	3
Currency translation adjustments, net of deferred taxes of $- and $-	2	4
Comprehensive income	1,451	1,043
Net (income) loss attributable to noncontrolling interests	(223)	(96)
Other comprehensive (income) loss attributable to noncontrolling interests	0	2
Comprehensive income attributable to Comcast Corporation	$ 1,228	$ 945