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Stockholders' Equity - Common Stock Dividends and Reconciliation of Outstanding Common Shares (Details) - Common stock - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended				12 Months Ended
	Jan. 31, 2022	Jun. 30, 2021	Feb. 29, 2020	Nov. 30, 2018	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Stock Dividends
Dividends declared per common share (in dollars per share)					$ 2.44	$ 2.24	$ 2.18
Reconciliation of Outstanding Common Shares
Outstanding shares at beginning of period	261.7				273.3	276.6	279.5
Shares issued					3.0	2.6	2.6
Treasury stock acquired					(14.6)	(5.9)	(5.5)
Outstanding shares at end of period					261.7	273.3	276.6
Common stock share repurchase disclosures
Share repurchase program, maximum authorized amount (in dollars)	$ 1,600.0	$ 1,200.0	$ 900.0	$ 500.0

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Number of shares issued which are neither cancelled nor held in the treasury.

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Number of new stock issued during the period.

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