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Debt (Details) - USD ($)	Sep. 30, 2021	Aug. 31, 2021	May 31, 2021	Dec. 31, 2020
Senior Notes Due 2031 | Senior Notes
Debt Instrument [Line Items]
Senior notes issued			$ 500,000,000
Stated rates			2.30%
Senior Notes Due in 2121 | Senior Notes
Debt Instrument [Line Items]
Senior notes issued			$ 600,000,000
Stated rates			4.10%
Senior Notes Due 2051 | Senior Notes
Debt Instrument [Line Items]
Senior notes issued		$ 600,000,000
Stated rates		2.90%
Securitization Borrowings
Debt Instrument [Line Items]
Accounts receivable securitization program, maximum borrowing capacity			$ 400,000,000
Accounts receivable securitization balance	$ 0			$ 0
Available borrowing capacity	$ 400,000,000			$ 400,000,000

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