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Debt (Schedule Of Long-Term Debt Instruments) (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]    
Debt, Gross $ 9,046,000,000 $ 9,524,000,000
Less unamortized discount 45,000,000 47,000,000
Debt 9,001,000,000 9,477,000,000
5.5% Notes Due 2013 [Member]
    
Debt Instrument [Line Items]    
Stated interest rate 5.50%  
Loews Corp [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 700,000,000  
Less unamortized discount 6,000,000  
Debt 694,000,000  
Loews Corp [Member] | 8.9% Debentures Due 2011 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross   175,000,000
Stated interest rate 8.90%  
Maturity year 2011  
Effective interest rate 9.00%  
Debt authorized 175,000,000  
Loews Corp [Member] | 5.3% Notes Due 2016 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 400,000,000 400,000,000
Stated interest rate 5.30%  
Maturity year 2016  
Effective interest rate 5.40%  
Debt authorized 400,000,000  
Loews Corp [Member] | 6.0% Notes Due 2035 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 300,000,000 300,000,000
Stated interest rate 6.00%  
Maturity year 2035  
Effective interest rate 6.20%  
Debt authorized 300,000,000  
CNA Financial [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 2,625,000,000  
Less unamortized discount 17,000,000  
Debt 2,608,000,000  
CNA Financial [Member] | 6.0% Notes Due 2011 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross   400,000,000
Stated interest rate 6.00%  
Maturity year 2011  
Effective interest rate 6.10%  
Debt authorized 400,000,000  
CNA Financial [Member] | 8.4% Notes Due 2012 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 70,000,000 70,000,000
Stated interest rate 8.40%  
Maturity year 2012  
Effective interest rate 8.60%  
Debt authorized 100,000,000  
CNA Financial [Member] | 5.9% Notes Due 2014 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 549,000,000 549,000,000
Stated interest rate 5.90%  
Maturity year 2014  
Effective interest rate 6.00%  
Debt authorized 549,000,000  
CNA Financial [Member] | 6.5% Notes Due 2016 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 350,000,000 350,000,000
Stated interest rate 6.50%  
Maturity year 2016  
Effective interest rate 6.60%  
Debt authorized 350,000,000  
CNA Financial [Member] | 7.0% Notes Due 2018 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 150,000,000 150,000,000
Stated interest rate 7.00%  
Maturity year 2018  
Effective interest rate 7.10%  
Debt authorized 150,000,000  
CNA Financial [Member] | 7.4% Notes Due 2019 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 350,000,000 350,000,000
Stated interest rate 7.40%  
Maturity year 2019  
Effective interest rate 7.50%  
Debt authorized 350,000,000  
CNA Financial [Member] | 5.9% Notes Due 2020 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 500,000,000 500,000,000
Stated interest rate 5.90%  
Maturity year 2020  
Effective interest rate 6.00%  
Debt authorized 500,000,000  
CNA Financial [Member] | 5.8% Notes Due 2021 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 400,000,000  
Stated interest rate 5.80%  
Maturity year 2021  
Effective interest rate 5.90%  
Debt authorized 400,000,000  
CNA Financial [Member] | 7.3% Debentures Due 2023 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 243,000,000 243,000,000
Stated interest rate 7.30%  
Maturity year 2023  
Effective interest rate 7.30%  
Debt authorized 250,000,000  
CNA Financial [Member] | 5.1% Debentures Due 2034 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross   31,000,000
Stated interest rate 5.10%  
Maturity year 2034  
Effective interest rate 5.10%  
Debt authorized 31,000,000  
CNA Financial [Member] | Other Senior Debt [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 13,000,000 23,000,000
Effective interest rate 2.90% 4.60%
Diamond Offshore [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 1,500,000,000  
Less unamortized discount 12,000,000  
Debt 1,488,000,000  
Diamond Offshore [Member] | 5.2% Notes Due 2014 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 250,000,000 250,000,000
Stated interest rate 5.20%  
Maturity year 2014  
Effective interest rate 5.20%  
Debt authorized 250,000,000  
Diamond Offshore [Member] | 4.9% Notes Due 2015 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 250,000,000 250,000,000
Stated interest rate 4.90%  
Maturity year 2015  
Effective interest rate 5.00%  
Debt authorized 250,000,000  
Diamond Offshore [Member] | 5.9% Notes Due 2019 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 500,000,000 500,000,000
Stated interest rate 5.90%  
Maturity year 2019  
Effective interest rate 6.00%  
Debt authorized 500,000,000  
Diamond Offshore [Member] | 5.7% Notes Due 2039 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 500,000,000 500,000,000
Stated interest rate 5.70%  
Maturity year 2039  
Effective interest rate 5.80%  
Debt authorized 500,000,000  
HighMount [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 700,000,000  
Debt 700,000,000  
HighMount [Member] | Variable Rate Term Loans Due 2012 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross   1,100,000,000
Maturity year 2012  
Effective interest rate 5.70%  
HighMount [Member] | Variable Rate Credit Facility Due 2016 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 700,000,000  
Maturity year 2016  
Effective interest rate 3.40%  
Boardwalk Pipeline [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 3,408,000,000  
Less unamortized discount 10,000,000  
Debt 3,398,000,000  
Boardwalk Pipeline [Member] | Variable Rate Revolving Credit Facility Due 2012 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 458,000,000 703,000,000
Maturity year 2012  
Effective interest rate 0.50%  
Boardwalk Pipeline [Member] | 8.0% Subordinated Loan Due 2012 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 100,000,000 100,000,000
Stated interest rate 8.00%  
Maturity year 2012  
Boardwalk Pipeline [Member] | Variable Rate Term Loans Due 2016 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 200,000,000  
Maturity year 2016  
Effective interest rate 1.80%  
Boardwalk Pipeline [Member] | 5.8% Notes Due 2012 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 225,000,000 225,000,000
Stated interest rate 5.80%  
Maturity year 2012  
Effective interest rate 6.00%  
Debt authorized 225,000,000  
Boardwalk Pipeline [Member] | 5.5% Notes Due 2013 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross   250,000,000
Stated interest rate 5.50%  
Maturity year 2013  
Effective interest rate 5.80%  
Debt authorized 250,000,000  
Boardwalk Pipeline [Member] | 4.6% Notes Due 2015 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 250,000,000 250,000,000
Stated interest rate 4.60%  
Maturity year 2015  
Effective interest rate 5.10%  
Debt authorized 250,000,000  
Boardwalk Pipeline [Member] | 5.1% Notes Due 2015 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 275,000,000 275,000,000
Stated interest rate 5.10%  
Maturity year 2015  
Effective interest rate 5.20%  
Debt authorized 275,000,000  
Boardwalk Pipeline [Member] | 5.9% Notes Due 2016 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 250,000,000 250,000,000
Stated interest rate 5.90%  
Maturity year 2016  
Effective interest rate 6.00%  
Debt authorized 250,000,000  
Boardwalk Pipeline [Member] | 5.5% Notes Due 2017 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 300,000,000 300,000,000
Stated interest rate 5.50%  
Maturity year 2017  
Effective interest rate 5.60%  
Debt authorized 300,000,000  
Boardwalk Pipeline [Member] | 6.3% Notes Due 2017 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 275,000,000 275,000,000
Stated interest rate 6.30%  
Maturity year 2017  
Effective interest rate 6.40%  
Debt authorized 275,000,000  
Boardwalk Pipeline [Member] | 5.2% Notes Due 2018 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 185,000,000 185,000,000
Stated interest rate 5.20%  
Maturity year 2018  
Effective interest rate 5.40%  
Debt authorized 185,000,000  
Boardwalk Pipeline [Member] | 5.8% Notes Due 2019 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 350,000,000 350,000,000
Stated interest rate 5.80%  
Maturity year 2019  
Effective interest rate 5.90%  
Debt authorized 350,000,000  
Boardwalk Pipeline [Member] | 4.5% Notes Due 2021 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 440,000,000  
Stated interest rate 4.50%  
Maturity year 2021  
Effective interest rate 5.00%  
Debt authorized 440,000,000  
Boardwalk Pipeline [Member] | 7.3% Debentures Due 2027 [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 100,000,000 100,000,000
Stated interest rate 7.30%  
Maturity year 2027  
Effective interest rate 8.10%  
Debt authorized 100,000,000  
Loews Hotels [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 213,000,000  
Debt 213,000,000  
Loews Hotels [Member] | Senior Debt Principally Mortgages [Member]
    
Debt Instrument [Line Items]    
Debt, Gross 213,000,000 220,000,000
Effective interest rate 3.90% 4.10%
Elimination Of Intercompany Debt [Member]
    
Debt Instrument [Line Items]    
Debt, Gross (100,000,000) (100,000,000)
Debt $ (100,000,000)