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Condensed Consolidated Statement of Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue $ 21,735 $ 21,286 $ 44,526 $ 41,873
Costs and Expenses:        
Programming and production 6,300 6,330 13,729 12,391
Other operating and administrative 6,365 6,168 12,879 12,107
Advertising, marketing and promotion 1,653 1,713 3,257 3,290
Depreciation 2,021 1,970 4,032 3,885
Amortization 582 537 1,170 1,090
Other operating gains (200) 0 (200) 0
Total costs and expenses 16,721 16,718 34,867 32,763
Operating income 5,014 4,568 9,659 9,110
Interest expense (806) (758) (1,583) (1,513)
Investment and other income (loss), net 77 99 203 229
Income before income taxes 4,285 3,909 8,279 7,826
Income tax expense (1,077) (1,367) (1,895) (2,629)
Net income 3,208 2,542 6,384 5,197
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock (8) 21 50 103
Net income attributable to Comcast Corporation $ 3,216 $ 2,521 $ 6,334 $ 5,094
Basic earnings per common share attributable to Comcast Corporation shareholders (in dollars per share) $ 0.70 $ 0.53 $ 1.37 $ 1.08
Diluted earnings per common share attributable to Comcast Corporation shareholders (in dollars per share) 0.69 0.52 1.36 1.06
Dividends declared per common share (in dollars per share) $ 0.19 $ 0.1575 $ 0.38 $ 0.315
NBCUniversal Media LLC [Member]        
Revenue $ 8,313 $ 8,318 $ 17,843 $ 16,171
Costs and Expenses:        
Programming and production 3,478 3,576 8,051 6,876
Other operating and administrative 1,955 1,890 3,927 3,718
Advertising, marketing and promotion 720 778 1,420 1,484
Depreciation 258 265 500 496
Amortization 295 255 563 532
Total costs and expenses 6,706 6,764 14,461 13,106
Operating income 1,607 1,554 3,382 3,065
Interest expense (133) (149) (260) (292)
Investment and other income (loss), net (168) (15) (172) (16)
Income before income taxes 1,306 1,390 2,950 2,757
Income tax expense (88) (99) (179) (191)
Net income 1,218 1,291 2,771 2,566
Less: Net income (loss) attributable to noncontrolling interests (29) 12 11 85
Net income attributable to Comcast Corporation $ 1,247 $ 1,279 $ 2,760 $ 2,481