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Common Stock (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jan. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Common Stock:        
Issuance of equity     $ 23  
Purchase of treasury stock, value   $ 15,431 $ 11,217 $ 6,873
Remaining value of Class A common stock shares authorized to be repurchased   $ 1,900    
Roll Forward of Common Shares:        
Exercise of stock options   1,568,000 3,160,000 1,271,000
Purchase of treasury stock   (23,227,642) (20,219,461) (17,386,100)
Liberty Broadband [Member]        
Roll Forward of Common Shares:        
Issuance of equity     35,112  
A/N        
Roll Forward of Common Shares:        
Issuance of equity     20,182  
Share buybacks | Liberty Broadband [Member]        
Common Stock:        
Purchase of treasury stock, value   $ 4,179    
Roll Forward of Common Shares:        
Purchase of treasury stock   (6,077,664)    
Share buybacks | Liberty Broadband [Member] | Subsequent Event        
Common Stock:        
Purchase of treasury stock, value $ 341      
Roll Forward of Common Shares:        
Purchase of treasury stock (500,000)      
Income tax withholding        
Common Stock:        
Purchase of treasury stock, value   $ 393 $ 578 $ 139
Roll Forward of Common Shares:        
Purchase of treasury stock   (586,008) (1,022,783) (380,797)
Exercise cost        
Roll Forward of Common Shares:        
Purchase of treasury stock   (626,509) (752,475) (307,845)
Class A Common Stock        
Roll Forward of Common Shares:        
Shares outstanding, beginning of period (in shares) 172,741,236 193,730,992 209,975,963 225,353,807
Issuance of equity     55,294  
Exercise of stock options   1,568,488 3,160,065 1,271,419
Restricted stock issuances, net of cancellations   4,627 5,992 8,284
Restricted stock unit vesting   664,771 753,139 728,553
Purchase of treasury stock   (23,227,642) (20,219,461) (17,386,100)
Shares outstanding, end of period (in shares)   172,741,236 193,730,992 209,975,963
Class B Common Stock        
Roll Forward of Common Shares:        
Shares outstanding, beginning of period (in shares) 1 1 1 1
Issuance of equity     0  
Exercise of stock options   0 0 0
Restricted stock issuances, net of cancellations   0 0 0
Restricted stock unit vesting   0 0 0
Purchase of treasury stock   0 0 0
Shares outstanding, end of period (in shares)   1 1 1