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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial information
(in millions, except per share data)
First
Quarter

Second
Quarter

Third
Quarter

Fourth
Quarter

Total
Year

2019
 
 
 
 
 
Revenue
$
26,859

$
26,858

$
26,827

$
28,398

$
108,942

Operating income
$
5,182

$
5,356

$
5,340

$
5,247

$
21,125

Net income attributable to Comcast Corporation
$
3,553

$
3,125

$
3,217

$
3,162

$
13,057

Basic earnings per common share attributable to Comcast Corporation shareholders
$
0.78

$
0.69

$
0.71

$
0.69

$
2.87

Diluted earnings per common share attributable to Comcast Corporation shareholders
$
0.77

$
0.68

$
0.70

$
0.68

$
2.83

Dividends declared per common share
$
0.21

$
0.21

$
0.21

$
0.21

$
0.84

2018(a)
 
 
 
 
 
Revenue
$
22,791

$
21,735

$
22,135

$
27,846

$
94,507

Operating income
$
4,645

$
5,014

$
4,836

$
4,514

$
19,009

Net income attributable to Comcast Corporation
$
3,118

$
3,216

$
2,886

$
2,511

$
11,731

Basic earnings per common share attributable to Comcast Corporation shareholders
$
0.67

$
0.70

$
0.63

$
0.55

$
2.56

Diluted earnings per common share attributable to Comcast Corporation shareholders
$
0.66

$
0.69

$
0.62

$
0.55

$
2.53

Dividends declared per common share
$
0.19

$
0.19

$
0.19

$
0.19

$
0.76


Minor differences may exist due to rounding.
(a)
The 2018 amounts include the operations of Sky from October 9, 2018 through December 31, 2018. See Note 8 for additional information.