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Earnings Per Share and Certain Related Information - Share Repurchases (Details) - 2020 Stock Repurchase Program - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Dec. 31, 2021	Jan. 16, 2020
Class of Stock [Line Items]
Amount authorized to be repurchased	$ 1,000	$ 1,000
Average Price Per Share (in dollars per share)	$ 137.55
Shares Repurchased (in shares)	342,054
Total Shares Retired (in shares)	342,054

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the 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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Total cost of shares repurchased divided by the total number of shares repurchased.

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