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Capital Stock
 12 Months Ended
Dec. 31, 2022
Common Stock  
Class of Stock [Line Items]  
Capital Stock
Note 13. Capital Stock

Our amended and restated articles of incorporation authorize 5.0 billion shares of Common Stock and 500 million shares of preferred stock. There were no preferred shares issued and outstanding at December 31, 2022, 2021 and 2020. Shares of Common Stock issued, in treasury and outstanding were:
Shares IssuedTreasury SharesShares
Outstanding
Balance at January 1, 20201,996,537,778 (561,531,524)1,435,006,254 
Shares repurchased— (25,071,845)(25,071,845)
Exercise of stock options and issuance of
   other stock awards		— 9,239,812 9,239,812 
Balance at December 31, 20201,996,537,778 (577,363,557)1,419,174,221 
Shares repurchased— (35,384,366)(35,384,366)
Exercise of stock options and issuance of
   other stock awards		— 7,840,684 7,840,684 
Balance at December 31, 20211,996,537,778 (604,907,239)1,391,630,539 
Shares repurchased— (31,556,510)(31,556,510)
Exercise of stock options and issuance of
   other stock awards		— 5,817,062 5,817,062 
Balance at December 31, 20221,996,537,778 (630,646,687)1,365,891,091 

Stock plan awards to employees and non-employee directors are issued from treasury shares. At December 31, 2022, 70.4 million shares of Common Stock held in treasury were reserved for stock options and other stock awards.

Share Repurchase Program:
Between 2013 and 2020, our Board of Directors authorized the repurchase of a total of $23.7 billion of our Common Stock and extended the program through December 31, 2023. Repurchases under the program are determined by management and are wholly discretionary. Prior to January 1, 2022, we had repurchased approximately $20.0 billion of Common Stock pursuant to this authorization. During the twelve months ended December 31, 2022, we repurchased approximately 31.6 million shares of Common Stock at an average cost of $63.41 per share, or an aggregate cost of approximately $2.0 billion, all of which was paid during the period. All share repurchases were funded through available cash and commercial paper issuances. Our Board of Directors approved a new program authorizing the repurchase of up to $6.0 billion of our Common Stock through December 31, 2025. This authorization, effective January 1, 2023, replaces our current share repurchase program.