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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Basic earnings per common share:        
Net income $ 178,487 $ 167,767 $ 480,918 $ 473,743
Preferred stock dividends, deemed dividend and accretion of discount (7,967) (7,983) (23,904) (24,016)
Net income applicable to common shareholders 170,520 159,784 457,014 449,727
Average common shares issued and outstanding 830,398,000 857,871,000 835,410,000 861,543,000
Basic earnings per common share $ 0.21 $ 0.19 $ 0.55 $ 0.52
Diluted earnings per common share        
Net income applicable to common shareholders 170,520 159,784 457,014 449,727
Effect of assumed preferred stock conversion 7,967 7,983 23,904 24,016
Net income applicable to diluted earnings per share $ 170,520 $ 159,784 $ 457,014 $ 449,727
Average common shares issued and outstanding 830,398,000 857,871,000 835,410,000 861,543,000
Dilutive potential common shares:        
Stock options and restricted stock units 9,254,000 4,479,000 7,764,000 4,007,000
Shares held in deferred compensation plans 1,373,000 1,238,000 1,350,000 1,218,000
Dilutive potential common shares: 10,627,000 5,717,000 9,114,000 5,225,000
Total diluted average common shares issued and outstanding 841,025,000 863,588,000 844,524,000 866,768,000
Diluted earnings (loss) per common share $ 0.20 $ 0.19 $ 0.54 $ 0.52
Stock Options [Member]
        
Earnings Loss Per Share (Textuals) [Abstract]        
Options outstanding to purchase common stock shares having antidilutive effect 5,600,000 23,500,000 9,700,000 24,600,000