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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) (USD $)
In Millions, except Share data
Total
Common Stock
Additional Paid-In Capital
Treasury Stock
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Comprehensive Income
Balance at Dec. 31, 2010$ 10,203$ 0$ 12,353$ (2,194)$ 57$ (13) 
Balance (in shares) at Dec. 31, 2010 1,382 (199)   
Components of comprehensive income:       
Net income986   986 986
Foreign currency translation adjustment(18)    (18)(18)
Unrealized appreciation (depreciation) on investments, net of taxes2    22
Total comprehensive income970     970
Issuance of common stock pursuant to employee stock options and restricted stock rights39 39    
Issuance of common stock pursuant to employee stock options and restricted stock rights (in shares) 7     
Stock-based compensation expense related to employee stock options and restricted stock rights77 77    
Dividends ($0.165 per common share)(194)   (194)  
Shares repurchased(524)  (524)   
Shares repurchased (in shares)   (47)   
Retirement of treasury shares  (2,718)2,718   
Retirement of treasury shares (in shares) (246) 246   
Balance at Sep. 30, 2011$ 10,571$ 0$ 9,751$ 0$ 849$ (29) 
Balance (in shares) at Sep. 30, 2011 1,143 0