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Shareholders' Equity (Details)	12 Months Ended
Shareholders' Equity (Details)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Common Stock Activity [Abstract]
Common stock outstanding, end of year	272,460,951	297,272,913	332,007,664
Common Stock [Member]
Common Stock Activity [Abstract]
Balance, beginning of year	371,980,460	371,980,460	371,980,710
Share activity under stock-based employee compensation plans	0	0	(250)
Balance, end of year	371,980,460	371,980,460	371,980,460
Treasury Stock [Member]
Common Stock Activity [Abstract]
Balance, beginning of year	74,707,547	39,972,796	19,726,097
Repurchase of shares	27,582,889	37,667,829	22,623,775
Share activity under stock-based employee compensation plans	(2,770,927)	(2,933,078)	(2,377,076)
Balance, end of year	99,519,509	74,707,547	39,972,796

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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