Annual report pursuant to Section 13 and 15(d)

Debt (Details)

v3.20.4
Debt (Details) - USD ($)
 12 Months Ended
Dec. 18, 2020
Nov. 19, 2020
Oct. 15, 2020
Aug. 31, 2020
Aug. 27, 2020
Aug. 12, 2020
Jul. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
2.75% Exchangeable Senior Debentures due 2050                  
Debt disclosures                  
Carrying value               $ 608,804,000  
Principal amount         $ 575,000,000        
Interest rate (as a percent)         2.75%     2.75%  
Percentage of redemption and purchase price         100.00%        
2.75% Exchangeable Senior Debentures due 2050 | Charter | Series A common stock                  
Debt disclosures                  
Shares attributable to debentures per $1,000 original principal amount of Debentures         1.1661        
Total shares attributable to debentures         670,507        
Debt instrument, face amount per debenture         $ 1,000        
Exchange price of shares attributable to debentures         $ 857.56        
Exchangeable Senior Debentures Option                  
Debt disclosures                  
Principal amount   $ 75,000,000     $ 75,000,000        
1.25% Exchangeable Senior Debentures due 2050                  
Debt disclosures                  
Carrying value               $ 836,971,000  
Principal amount   $ 825,000,000              
Interest rate (as a percent)   1.25%           1.25%  
Percentage of redemption and purchase price   100.00%              
1.25% Exchangeable Senior Debentures due 2050 | Charter | Series A common stock                  
Debt disclosures                  
Shares attributable to debentures per $1,000 original principal amount of Debentures   1.1111              
Total shares attributable to debentures   916,657              
Debt instrument, face amount per debenture   $ 1,000              
Exchange price of shares attributable to debentures   $ 900.00              
1.75% Exchangeable Senior Debentures due 2046                  
Debt disclosures                  
Carrying value               $ 26,350,000  
Interest rate (as a percent)               1.75%  
1.75% Exchangeable Senior Debentures due 2046 | GCI Liberty Inc                  
Debt disclosures                  
Principal amount $ 14,500,000                
Fair value of debt $ 26,100,000                
Interest rate (as a percent) 1.75%                
Percentage of redemption and purchase price 100.00%                
Exchange of debentures based on share price exceeds on par value 130.00%                
Minimum number of days share price exceeds par value 20 days                
Number of trading days 30 days                
Exchange period 1 year                
1.75% Exchangeable Senior Debentures due 2046 | Charter | GCI Liberty Inc                  
Debt disclosures                  
Shares attributable to debentures per $1,000 original principal amount of Debentures 2.6989                
Total shares attributable to debentures 39,231                
Debt instrument, face amount per debenture $ 1,000                
Exchange price of shares attributable to debentures $ 370.52                
Revolving Credit Facility                  
Debt disclosures                  
Principal amount     $ 550,000,000.0            
Revolving Credit Facility | LIBOR                  
Debt disclosures                  
Interest rate basis     LIBOR            
Line of credit                  
Debt disclosures                  
Carrying value               $ 704,000,000  
Standby Letters of Credit                  
Debt disclosures                  
Principal amount     $ 25,000,000            
SPV | Margin Loan Facility                  
Debt disclosures                  
Maximum borrowing capacity including incremental facility           $ 2,300,000,000      
Maximum borrowing capacity           1,000,000,000.0      
Additional allowed borrowing capacity           $ 1,300,000,000      
Borrowings $ 1,300,000,000     $ 100,000,000     $ 25,000,000    
Carrying value               2,000,000,000 $ 575,000,000
Remaining borrowing capacity               $ 300,000,000  
SPV | Margin Loan Facility | Charter                  
Debt disclosures                  
Number of common shares pledged as collateral               12,300,000  
Value of pledged collateral               $ 8,100,000,000  
SPV | Margin Loan Facility | Three-month LIBOR                  
Debt disclosures                  
Interest rate basis           three-month LIBOR      
Basis spread on variable rate 1.85%         1.50%