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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of Authorized Common Stock Repurchase Programs | 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 |

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