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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2017
Authorized Common Stock Repurchase Programs | Shares of Common Stock issued, in treasury and outstanding were:
|  |  |  |  |  |  |  | Shares |
| Shares Issued |  |  | Treasury Shares |  |  | Outstanding |
Balance at January 1, 2015 |  |  | 1,996,537,778 |  |  |  | (332,896,779 | ) |  |  | 1,663,640,999 |
Shares repurchased |  |  | – |  |  |  | (91,875,878 | ) |  |  | (91,875,878 | )
Exercise of stock options and issuance of other stock awards |  |  | – |  |  |  | 8,268,033 |  |  |  | 8,268,033 |
Balance at December 31, 2015 |  |  | 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 |

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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