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Equity (Common Stock Changes in Number of Shares Issued, Held in Treasury and Outstanding) (Details)	3 Months Ended
	Mar. 31, 2021 shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning	666,305,189
Balance, ending	666,305,189
Issued
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning	666,300,000
Common Stock issued	0.0
Common Stock acquired	0.0
Stock-based compensation programs	0.0
Balance, ending	666,300,000
Held In Treasury
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning	269,900,000
Common Stock issued	0.0
Common Stock acquired	4,300,000
Stock-based compensation programs	(2,200,000)
Balance, ending	272,000,000.0
Outstanding
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning	396,400,000
Common Stock issued	0.0
Common Stock acquired	(4,300,000)
Stock-based compensation programs	2,200,000
Balance, ending	394,300,000

X

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

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

+ References

No definition available.

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Number of new stock issued during the period.

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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Number of shares that have been repurchased during the period and are being held in treasury.

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