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Stock-Based Compensation Status of Outstanding Stock Options (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Statusof Stock Options [Abstract]
Outstanding as of January 1, 2020 | shares	20,763
Exercised | shares	(918)
Outstanding as of December 31, 2020 | shares	19,845
Outstanding as of January 1, 2020 | $ / shares	$ 77.82
Exercised | $ / shares	77.77
Outstanding as of December 31, 2020 | $ / shares	$ 77.83

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Status of Stock Options [Abstract]

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Number of options outstanding, including both vested and non-vested options.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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

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