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Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands	1 Months Ended			2 Months Ended		3 Months Ended		9 Months Ended
	Feb. 28, 2021	Jan. 31, 2021	Dec. 31, 2020	Feb. 28, 2021	Dec. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Class of Stock [Line Items]
Repurchased of common stock						$ 122,000,000	$ 446,000,000
Payments to settle shares purchased								$ 128,000,000	$ 453,000,000
Common Stock
Class of Stock [Line Items]
Common stock authorized								$ 500,000,000	$ 500,000,000
Repurchased of common stock (in shares)		577	29		766	1,000	3,000
Repurchased of common stock	$ 122,000,000				$ 159,000,000
Average cost (USD per share)				$ 211.65	$ 208.37
Payments to settle shares purchased			$ 6,000,000

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The cash outflow to reacquire common stock 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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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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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