Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Details)

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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Basic earnings per common share:        
Net income $ 150,651 $ 152,706 $ 302,431 $ 305,976
Preferred stock dividends, deemed dividend and accretion of discount (7,967) (7,984) (15,937) (16,033)
Net income applicable to common shareholders 142,684 144,722 286,494 289,943
Average common shares issued and outstanding 834,730,000 862,261,000 837,917,000 863,380,000
Basic earnings per common share $ 0.17 $ 0.17 $ 0.34 $ 0.34
Diluted earnings per common share        
Net income applicable to common shareholders 142,684 144,722 286,494 289,943
Effect of assumed preferred stock conversion 7,967 7,984 15,937 16,033
Net income applicable to diluted earnings per share $ 142,684 $ 144,722 $ 286,494 $ 289,943
Average common shares issued and outstanding 834,730,000 862,261,000 837,917,000 863,380,000
Dilutive potential common shares:        
Stock options and restricted stock units 7,758,000 4,075,000 7,019,000 3,769,000
Shares held in deferred compensation plans 1,352,000 1,215,000 1,338,000 1,208,000
Dilutive potential common shares: 9,110,000 5,290,000 8,357,000 4,977,000
Total diluted average common shares issued and outstanding 843,840,000 867,551,000 846,274,000 868,357,000
Diluted earnings (loss) per common share $ 0.17 $ 0.17 $ 0.34 $ 0.33
Earnings Loss Per Share (Textuals) [Abstract]        
Options outstanding to purchase common stock shares having antidilutive effect     11,100,000 17,700,000
Stock Options [Member]
        
Earnings Loss Per Share (Textuals) [Abstract]        
Options outstanding to purchase common stock shares having antidilutive effect 11,200,000 17,700,000