v2.4.0.6
Noncontrolling Interests (Tables)
6 Months Ended
Jun. 30, 2012
Noncontrolling Interests [Abstract]  
Schedule Summarizing Changes in Equity Resulting from Net Income Attributable to Parent and Transfers to or from Noncontrolling Interests
   Six Months Ended
   June 30
(in millions) 2012 2011
Net income attributable to Comcast Corporation$ 2,572$ 1,965
Transfers from (to) noncontrolling interests:    
 Increase in Comcast Corporation additional paid-in capital resulting from the    
  issuance of noncontrolling equity interest  -  1,692
 Increase in Comcast Corporation additional paid-in capital resulting from the    
  purchase of noncontrolling interest  2  -
Changes in equity resulting from net income attributable to Comcast Corporation     
 and transfers from (to) noncontrolling interests$ 2,574$ 3,657