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Consolidated Statement of Changes In Shareholders' Equity (USD $)
In Thousands, unless otherwise specified
Total
Preferred stock [Member]
Common stock [Member]
Common stock [Member]
Exercise of Series C stock warrants [Member]
Common stock [Member]
Exercise of Series A stock warrants [Member]
Common stock issuable [Member]
Additional paid-in capital [Member]
Additional paid-in capital [Member]
Exercise of Series C stock warrants [Member]
Additional paid-in capital [Member]
Exercise of Series A stock warrants [Member]
Retained earnings [Member]
Accumulated other comprehensive income (loss), net [Member]
Beginning Balance at Dec. 31, 2011 $ 9,271,209 $ 864,585 $ 62,842     $ 4,072 $ 2,828,986     $ 5,867,165 $ (356,441)
Total comprehensive income 859,671                 733,305 126,366
Preferred stock cash dividends (40,088)                 (40,088)  
Amortization of preferred stock discount   5,831               (5,831)  
Stock-based compensation plans:                      
Compensation expense, net 37,883   228       37,655        
Exercises of stock options, net 72,484   545       71,939        
Stock purchase plan 10,101   75       10,026        
Directors' stock plan 1,121   7       1,114        
Deferred compensation plans, net, including dividend equivalents (160)   5     (621) 576     (120)  
Other 952           952        
Common stock cash dividends - $2.10 per share (267,646)                 (267,646)  
Ending Balance at Sep. 30, 2012 9,945,527 870,416 63,702     3,451 2,951,248     6,286,785 (230,075)
Beginning Balance at Dec. 31, 2012 10,202,593 872,500 64,088     3,473 3,025,520     6,477,276 (240,264)
Total comprehensive income 959,260                 917,058 42,202
Preferred stock cash dividends (40,088)                 (40,088)  
Amortization of preferred stock discount   6,510               (6,510)  
Exercise of stock warrants into common stock       93 11     (93) (11)    
Stock-based compensation plans:                      
Compensation expense, net 29,973   147       29,826        
Exercises of stock options, net 134,728   747       133,981        
Directors' stock plan 1,229   6       1,223        
Deferred compensation plans, net, including dividend equivalents (109)   5     (584) 568     (98)  
Other 1,967           1,967        
Common stock cash dividends - $2.10 per share (273,351)                 (273,351)  
Ending Balance at Sep. 30, 2013 $ 11,016,202 $ 879,010 $ 65,097     $ 2,889 $ 3,192,981     $ 7,074,287 $ (198,062)