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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dividend reinvestment plan, shares     90,110,000 100,383,000 106,437,000
Stock purchase and compensation plans, shares     857,403,000 783,661,000 433,271,000
Dividends to stockholders, per share $ 0.13 [1] $ 0.13 [1] $ 0.52 $ 0.52 $ 0.52
Acquisition of treasury stock, shares     194,575,000 149,997,000 107,425,000
Preferred stock, par value per share $ 0 $ 0 $ 0 $ 0 $ 0
Preferred stock, shares authorized 5,000,000 5,000,000 5,000,000 5,000,000 5,000,000
Preferred stock, shares issued 0 0 0 0 0
Series A Preferred Stock [Member]
          
Preferred stock, par value per share $ 0 $ 0 $ 0 $ 0 $ 0
Preferred stock, shares authorized 300,000 300,000 300,000 300,000 300,000
[1] 1 See Note 20. “Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds” for a discussion of dividend restrictions.