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Equity (Tables)

12 Months Ended

Dec. 31, 2018

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:

	2018						2017						2016
	Common Stock			Treasury Stock			Common Stock			Treasury Stock			Common Stock			Treasury Stock
Balance January 1	3,577			880			3,577			828			3,577			796
Purchases of treasury stock	—			122			—			67			—			60
Issuances (1)	—			(17	)		—			(15	)		—			(28	)
Balance December 31	3,577			985			3,577			880			3,577			828

⁽¹⁾   Issuances primarily reflect activity under share-based compensation plans.

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- References

No definition available.

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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

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