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Consolidated Statements of Shareholders' Equity (USD $)
In Millions
Total
Preferred Stock [Member]
Common Stock [Member]
Paid-in Surplus [Member]
Retained Earnings [Member]
Unrealized Appreciation (Depreciation) of Investments Including Unrealized Other-Than-Temporary Impairment Losses [Member]
Foreign Currency Translation Gains (Losses) [Member]
Postretirement Benefit Costs Not Yet Recognized in Net Income [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Balance, Beginning of Year (Scenario, Previously Reported [Member])         $ 16,235          
Balance, Beginning of Year at Jan. 01, 2010   0 372 224 15,962 [1] 1,044 160 (484)   (1,917)
Cumulative Effect of Change in Accounting Principle, Net of Tax (Scenario, Adjustment [Member])         (273)          
Net Income 2,174       2,174          
Repurchase of Shares                   (2,008)
Changes Related to Stock-Based Employee Compensation (includes tax benefit of $27, $24 and $15)       (16)            
Change During Year, Net of Tax 70         76 (18) 12    
Dividends Declared (per share $1.64, $1.56 and $1.48)         (466)          
Shares Issued Under Stock-Based Employee Compensation Plans                   142
Balance, End of Year at Dec. 31, 2010 15,257 [1] 0 372 208 17,670 [1] 1,120 142 (472) 790 (3,783)
Net Income 1,678       1,678          
Repurchase of Shares                   (1,718)
Changes Related to Stock-Based Employee Compensation (includes tax benefit of $27, $24 and $15)       (18)            
Change During Year, Net of Tax 405         616 4 (215)    
Dividends Declared (per share $1.64, $1.56 and $1.48)         (445)          
Shares Issued Under Stock-Based Employee Compensation Plans                   142
Balance, End of Year at Dec. 31, 2011 15,301 [1] 0 372 190 18,903 [1] 1,736 146 (687) 1,195 (5,359)
Net Income 1,545       1,545          
Repurchase of Shares                   (935)
Changes Related to Stock-Based Employee Compensation (includes tax benefit of $27, $24 and $15)       (12)            
Change During Year, Net of Tax 236         277 (11) (30)    
Dividends Declared (per share $1.64, $1.56 and $1.48)         (439)          
Shares Issued Under Stock-Based Employee Compensation Plans                   131
Balance, End of Year at Dec. 31, 2012 $ 15,827 $ 0 $ 372 $ 178 $ 20,009 $ 2,013 $ 135 $ (717) $ 1,431 $ (6,163)
[1] As Adjusted