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Consolidated Statement of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Consolidated Statement of Comprehensive Income        
Net income $ 1,633 $ 1,367 $ 3,080 $ 2,406
Unrealized gains (losses) on marketable securities, net of deferred taxes of $-, $-, $- and $(3) 0 0 0 5
Deferred gains (losses) on cash flow hedges, net of deferred taxes of $20, $4, $9 and $(2) (35) (9) (15) 2
Realized (gains) losses on marketable securities, net of deferred taxes of $-, $1, $- and $5 0 (2) 0 (9)
Realized (gains) losses on cash flow hedges, net of deferred taxes of $(10), $(1), $(1) and $6 17 2 1 (10)
Employee benefit obligations, net of deferred taxes of $1, $1, $1 and $(1) (3) (4) (5) (1)
Currency translation adjustments, net of deferred taxes of $2, $-, $2 and $- (9) 3 (7) 7
Comprehensive income 1,603 1,357 3,054 2,400
Net (income) loss attributable to noncontrolling interests (285) (345) (508) (441)
Other comprehensive (income) loss attributable to noncontrolling interests 8 2 8 0
Comprehensive income attributable to Comcast Corporation $ 1,326 $ 1,014 $ 2,554 $ 1,959