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Shares and Stockholders' Equity (Changes In Common stock (Number Of Shares)) (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Changes In Common Stock (Number Of Shares) [Line Items]
Balance as of beginning-of-year	192,329,691
Balance as of end-of-year	191,149,192
Common stock as of End-of-Year
Basic basis	191,149,192	193,208,244
Diluted basis	192,464,319	195,027,909
Common Stock [Member]
Changes In Common Stock (Number Of Shares) [Line Items]
Balance as of beginning-of-year	192,329,691	196,668,532
Stock compensation/issued for benefit plans	711,138	349,636
Retirement/cancellation of shares	(1,891,637)	(3,809,924)
Balance as of end-of-year	191,149,192	193,208,244

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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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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