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Common Stock (Notes)
 3 Months Ended
Mar. 31, 2022
Common Stock [Abstract]  
Common Stock Common Stock
The following represents the Company's purchase of Charter Class A common stock and the effect on the consolidated statements of cash flows during the three months ended March 31, 2022 and 2021.

Three Months Ended March 31,
20222021
Shares$Shares$
Share buybacks 5,325,594 $3,172 5,556,318 $3,474 
Income tax withholding264,845 161 284,563 178 
Exercise cost148,657 309,815 
5,739,096 $3,333 6,150,696 $3,652 

Share buybacks above include shares of Charter Class A common stock purchased from Liberty Broadband Corporation (“Liberty Broadband”) as follows.

Three Months Ended March 31,
20222021
Number of shares purchased970,241 834,576 
Amount of shares purchased$602 $518 

In April 2022, the Company purchased from Liberty Broadband an additional 0.9 million shares of Charter Class A common stock for approximately $491 million.

As of March 31, 2022, Charter had remaining board authority to purchase an additional $1.2 billion of Charter’s Class A common stock and/or Charter Holdings common units, excluding purchases from Liberty Broadband. The Company also withholds shares of its Class A common stock in payment of income tax withholding owed by employees upon vesting of equity awards as well as exercise costs owed by employees upon exercise of stock options.
In 2021, Charter’s board of directors approved the retirement of the then currently held treasury stock and those shares were retired as of December 31, 2021. The Company accounts for treasury stock using the cost method and includes treasury stock as a component of total shareholders’ equity.