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Stockholders' Equity and Statutory Accounting Practices (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2008
Loews [Member]
Dec. 31, 2012
Continental Casualty Company [Member]
Dec. 31, 2008
Continental Casualty Company [Member]
Dec. 31, 2012
Hardy [Member]
Purchase price for preferred stock       $ 1,250      
Purchase price of surplus note of CCC           1,000  
Term of CCC surplus note           The surplus note of CCC had a term of 30 years and accrued interest at a rate of 10% per year. Interest on the note was payable quarterly.  
Interest accrual rate for CCC surplus note           10.00%  
Repayment on surplus note of CCC         250    
Common stock dividends declared, per share $ 0.60 $ 0.40           
Dividends per share, paid $ 0.60 $ 0.40           
Dividends payable without prior supervisory approval 550            
Syndicate 382's capital requirement             330
Capital provided by CCC             $ 66