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Summary of Significant Accounting Policies - Schedule of Dividends Payable (Details) - $ / shares	Jun. 05, 2020	Jun. 07, 2019	Jun. 08, 2018
Summary Of Significant Accounting Policies [Line Items]
Dividend per share	$ 2.44	$ 2.28	$ 2.12
Dividend Payable 1 [Member]
Summary Of Significant Accounting Policies [Line Items]
Dividend Date	Jun. 30, 2020	Jun. 28, 2019	Jun. 29, 2018
Record Date	Jun. 15, 2020	Jun. 17, 2019	Jun. 18, 2018
Dividend per share	$ 0.61	$ 0.57	$ 0.53
Dividend Payable 2 [Member]
Summary Of Significant Accounting Policies [Line Items]
Dividend Date	Sep. 30, 2020	Sep. 30, 2019	Sep. 28, 2018
Record Date	Sep. 15, 2020	Sep. 16, 2019	Sep. 14, 2018
Dividend per share	$ 0.61	$ 0.57	$ 0.53
Dividend Payable 3 [Member]
Summary Of Significant Accounting Policies [Line Items]
Dividend Date	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Record Date	Dec. 15, 2020	Dec. 16, 2019	Dec. 14, 2018
Dividend per share	$ 0.61	$ 0.57	$ 0.53
Dividend Payable 4 [Member]
Summary Of Significant Accounting Policies [Line Items]
Dividend Date	Mar. 31, 2021	Mar. 31, 2020	Mar. 29, 2019
Record Date	Mar. 15, 2021	Mar. 16, 2020	Mar. 15, 2019
Dividend per share	$ 0.61	$ 0.57	$ 0.53

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Summary of significant accounting policies.

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Date the declared dividend will be paid, in CCYY-MM-DD format.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

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