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, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Basic earnings per common share:        
Net income $ 152,706 $ 145,918 $ 305,976 $ 272,364
Preferred stock dividends, deemed dividend and accretion of discount (7,984) (7,704) (16,033) (15,407)
Net income applicable to common shareholders 144,722 138,214 289,943 256,957
Average common shares issued and outstanding 862,261 863,358 863,380 863,358
Basic earnings per common share $ 0.17 $ 0.16 $ 0.34 $ 0.30
Diluted earnings per common share        
Net income applicable to common shareholders 144,722 138,214 289,943 256,957
Effect of assumed preferred stock conversion 7,984 7,704 16,033 15,407
Net income applicable to diluted earnings per share $ 144,722 $ 138,214 $ 289,943 $ 256,957
Average common shares issued and outstanding 862,261 863,358 863,380 863,358
Dilutive potential common shares:        
Stock options and restricted stock units 4,075,000 3,171,000 3,769,000 3,084,000
Shares held in deferred compensation plans 1,215,000 940,000 1,208,000 911,000
Dilutive potential common shares: 5,290,000 4,111,000 4,977,000 3,995,000
Total diluted average common shares issued and outstanding 867,551 867,469 868,357 867,353
Diluted earnings (loss) per common share $ 0.17 $ 0.16 $ 0.33 $ 0.30
Earnings Loss Per Share (Textuals) [Abstract]        
Weighted average exercise price options $ 14.27 $ 19.69    
Stock Options [Member]
        
Earnings Loss Per Share (Textuals) [Abstract]        
Options outstanding to purchase common stock shares having antidilutive effect 17,700,000 15,300,000