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Condensed Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net income $ 3,208 $ 2,542 $ 6,384 $ 5,197
Unrealized gains (losses) on marketable securities, net of deferred taxes (1) (87) (2) 17
Deferred gains (losses) on cash flow hedges, net of deferred taxes (40) 5 (11) 12
Amounts reclassified to net income:        
Realized (gains) losses on cash flow hedges, net of deferred taxes 46 (14) 26 (14)
Employee benefit obligations, net of deferred taxes (8) (6) (16) 57
Currency translation adjustments, net of deferred taxes (173) (11) (16) 146
Comprehensive income 3,032 2,429 6,365 5,415
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock (8) 21 50 103
Less: Other comprehensive income (loss) attributable to noncontrolling interests (29) (5) (25) 82
Comprehensive income (loss) attributable to Comcast Corporation 3,069 2,413 6,340 5,230
NBCUniversal Media LLC [Member]        
Net income 1,218 1,291 2,771 2,566
Unrealized gains (losses) on marketable securities, net of deferred taxes 0 (140) 0 (139)
Deferred gains (losses) on cash flow hedges, net of deferred taxes 11 (8) (2) (22)
Amounts reclassified to net income:        
Employee benefit obligations, net of deferred taxes (3) (2) (7) 104
Currency translation adjustments, net of deferred taxes (215) (11) (11) 189
Comprehensive income 1,011 1,130 2,751 2,698
Less: Net income (loss) attributable to noncontrolling interests (29) 12 11 85
Less: Other comprehensive income (loss) attributable to noncontrolling interests (29) (5) (25) 82
Comprehensive income (loss) attributable to Comcast Corporation $ 1,069 $ 1,123 $ 2,765 $ 2,531