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Stockholders' Equity (Shares Outstanding) (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares Outstanding [Roll Forward]
Balance at beginning of year (in shares)	571,803,838	575,183,072	578,323,848
Stock options exercised (in shares)	2,325,073	620,766	659,224
Purchases of common stock (in shares)	0	(4,000,000)	(3,800,000)
Balance at end of year (in shares)	574,128,911	571,803,838	575,183,072

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- Definition

Share Outstanding [Roll Forward]

+ References

No definition available.

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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- Definition

Number of share options (or share units) exercised during the current period.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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