v3.26.1
Stockholders’ Equity - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Aug. 06, 2026
$ / shares
Jan. 02, 2026
vote
$ / shares
shares
Jun. 30, 2026
USD ($)
$ / shares
shares
Mar. 31, 2026
$ / shares
Jun. 30, 2026
$ / shares
shares
Class of Stock [Line Items]          
Preferred stock, authorized (in shares) | shares   20,000,000 20,000,000   20,000,000
Dividends paid (in dollars per share)       $ 0.375  
Dividends declared (in dollars per share)     $ 0.375   $ 0.750
Repurchases of common stock, accelerated share repurchase | $     $ 100    
Subsequent Event          
Class of Stock [Line Items]          
Dividends declared (in dollars per share) $ 0.375        
Class A Common Stock          
Class of Stock [Line Items]          
Common stock, authorized (in shares) | shares   7,500,000,000 7,500,000,000   7,500,000,000
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01   $ 0.01
Number of Class A common share issued upon conversion of each Class B common share (in shares) | shares   1      
Class B Common Stock          
Class of Stock [Line Items]          
Common stock, authorized (in shares) | shares   75,000,000 75,000,000   75,000,000
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01   $ 0.01
Number of votes per share | vote   15      
Percentage of total votes cast   33.33%      
Holders Of Comcast Class A Common Stock And Comcast Class B Common Stock | Versant Class A Common Stock And Versant Class B Common Stock | Separation And Distribution          
Class of Stock [Line Items]          
Percentage of ownership after distribution   100.00%      
Distribution ratio   0.04