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Capital Stock | 12 Months Ended
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Dec. 31, 2020
Class A Common Stock, no par value |
Class of Stock [Line Items] |
Capital Stock | Note 13. Capital Stock Our amended and restated articles of incorporation authorize 5.0 billion shares of Class A common stock (“Common Stock”) and 500 million shares of preferred stock. There were no preferred shares issued and outstanding at December 31, 2020, 2019 and 2018. Shares of Common Stock issued, in treasury and outstanding were:
|  | Shares Issued |  | Treasury Shares |  | Shares Outstanding
Balance at January 1, 2018 |  | 1,996,537,778 |  |  | (508,401,694) |  |  | 1,488,136,084 |
Shares repurchased |  | — |  |  | (47,258,884) |  |  | (47,258,884) |
Exercise of stock options and issuance of other stock awards |  | — |  |  | 10,122,655 |  |  | 10,122,655 |
Balance at December 31, 2018 |  | 1,996,537,778 |  |  | (545,537,923) |  |  | 1,450,999,855 |
Shares repurchased |  | — |  |  | (30,902,465) |  |  | (30,902,465) |
Exercise of stock options and issuance of other stock awards |  | — |  |  | 14,908,864 |  |  | 14,908,864 |
Balance at December 31, 2019 |  | 1,996,537,778 |  |  | (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, 2020 |  | 1,996,537,778 |  |  | (577,363,557) |  |  | 1,419,174,221 |
Stock plan awards to employees and non-employee directors are issued from treasury shares. At December 31, 2020, 85.8 million shares of Common Stock held in treasury were reserved for stock options and other stock awards. Share Repurchase Program: Between 2013 and 2017, our Board of Directors authorized the repurchase of a total of $13.7 billion of our Common Stock through December 31, 2018. On January 31, 2018, our Finance Committee, with authorization delegated from our Board of Directors, approved an increase of $6.0 billion in the share repurchase program, raising the authorization to $19.7 billion of Common Stock repurchases, and extended the program through December 31, 2020. On December 2, 2020, our Board of Directors approved an increase of $4.0 billion in the share repurchase program, raising the authorization to $23.7 billion of Common Stock repurchases, and extended the program through December 31, 2023. Repurchases under the program are determined by management and are wholly discretionary. Prior to January 1, 2020, we had repurchased approximately $16.5 billion of Common Stock pursuant to this authorization. During 2020, we repurchased approximately 25.1 million shares of Common Stock at an average cost of $55.87 per share, or an aggregate cost of approximately $1.4 billion, all of which was paid during the period except for approximately $30 million settled in January 2021. All share repurchases were funded through available cash and commercial paper issuances. As of December 31, 2020, we have approximately $5.8 billion in remaining share repurchase capacity.

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