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Summary of Significant Accounting Policies - Schedule of Dividends Payable (Details) - $ / shares | Jun. 05, 2020 | Jun. 07, 2019 | Jun. 08, 2018
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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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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References 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 + Details
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