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Capital Stock
 12 Months Ended
Dec. 31, 2018
Common Class A  
Class of Stock [Line Items]  
Capital Stock Note 12. 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, 2018, 2017 and 2016. Shares of Common Stock issued, in treasury and outstanding were:
 
 
 
Shares Issued
 
Treasury Shares
 
Shares
Outstanding
Balance at January 1, 2016
 
1,996,537,778

 
(416,504,624
)
 
1,580,033,154

Shares repurchased
 
—

 
(61,972,713
)
 
(61,972,713
)
Exercise of stock options and issuance of
   other stock awards
 
—

 
10,305,100

 
10,305,100

Balance at December 31, 2016
 
1,996,537,778

 
(468,172,237
)
 
1,528,365,541

Shares repurchased
 
—

 
(50,598,902
)
 
(50,598,902
)
Exercise of stock options and issuance of
   other stock awards
 
—

 
10,369,445

 
10,369,445

Balance at December 31, 2017
 
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



Stock plan awards to employees and non-employee directors are issued from treasury shares. At December 31, 2018, 111 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. Repurchases under the program are determined by management and are wholly discretionary. Prior to January 1, 2018, we had repurchased approximately $13.0 billion of Common Stock pursuant to this authorization. During 2018, we repurchased approximately 47.3 million shares of Common Stock at an average cost of $42.18 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. As of December 31, 2018, we have approximately $4.7 billion in remaining share repurchase capacity.