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Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Summary of Common Stock and Treasury Stock Transactions | A summary of common stock and treasury stock transactions (shares in millions) is as follows:
| 2020 |  | 2019 |  | 2018
| Common Stock |  | Treasury Stock |  | Common Stock |  | Treasury Stock |  | Common Stock |  | Treasury Stock
Balance January 1 | 3,577 |  |  | 1,038 |  |  | 3,577 |  |  | 985 |  |  | 3,577 |  |  | 880 |
Purchases of treasury stock | — |  |  | 16 |  |  | — |  |  | 66 |  |  | — |  |  | 122 |
Issuances (1) | — |  |  | (7) |  |  | — |  |  | (13) |  |  | — |  |  | (17) |
Balance December 31 | 3,577 |  |  | 1,047 |  |  | 3,577 |  |  | 1,038 |  |  | 3,577 |  |  | 985 |
(1) Issuances primarily reflect activity under share-based compensation plans.

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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