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Fair Value Measurements (Fair Value Hierarchy For Assets Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities $ 9,121 $ 9,093
Available for sale securities, equity securities 4,375 3,373
Separate accounts 692 734
Fair value of asset 14,192 13,164
Top Hat Savings Plan [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 14 9
Fixed Maturities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 9,121 9,093
Fixed Maturities [Member] | States, Municipalities And Political Subdivisions [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 3,211 3,289
Fixed Maturities [Member] | Convertibles And Bonds With Warrants Attached [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 17 31
Fixed Maturities [Member] | United States Government [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 7 8
Fixed Maturities [Member] | Government-Sponsored Enterprises [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 200 164
Fixed Maturities [Member] | Foreign Government [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 10 3
Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 143 28
Fixed Maturities [Member] | Corporate Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 5,533 5,570
Equity Securities [Member] | Common Stock [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, equity securities 4,213 3,238
Equity Securities [Member] | Preferred Stock [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, equity securities 162 135
Taxable Fixed Maturities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Separate accounts 682 689
Fair Value, Inputs, Level 1 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of asset 4,234 3,255
Fair Value, Inputs, Level 1 [Member] | Top Hat Savings Plan [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other investments 14 9
Fair Value, Inputs, Level 1 [Member] | Fixed Maturities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 7 8
Fair Value, Inputs, Level 1 [Member] | Fixed Maturities [Member] | United States Government [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 7 8
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Common Stock [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, equity securities 4,213 3,238
Fair Value, Inputs, Level 2 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of asset 9,954 9,904
Fair Value, Inputs, Level 2 [Member] | Fixed Maturities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 9,112 9,081
Fair Value, Inputs, Level 2 [Member] | Fixed Maturities [Member] | States, Municipalities And Political Subdivisions [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 3,211 3,288
Fair Value, Inputs, Level 2 [Member] | Fixed Maturities [Member] | Convertibles And Bonds With Warrants Attached [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 17 31
Fair Value, Inputs, Level 2 [Member] | Fixed Maturities [Member] | Government-Sponsored Enterprises [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 200 164
Fair Value, Inputs, Level 2 [Member] | Fixed Maturities [Member] | Foreign Government [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 10 3
Fair Value, Inputs, Level 2 [Member] | Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 143 28
Fair Value, Inputs, Level 2 [Member] | Fixed Maturities [Member] | Corporate Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 5,531 5,567
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Preferred Stock [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, equity securities 160 134
Fair Value, Inputs, Level 2 [Member] | Taxable Fixed Maturities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Separate accounts 682 689
Fair Value, Inputs, Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of asset 4 5
Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 2 4
Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member] | States, Municipalities And Political Subdivisions [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 0 1
Fair Value, Inputs, Level 3 [Member] | Fixed Maturities [Member] | Corporate Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, debt Securities 2 3
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Preferred Stock [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available for sale securities, equity securities $ 2 $ 1