Fair Value Measurements (Fair Value Of Deferred Annuities, Structured Settlements And Other Items) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	$ 1,138	$ 1,002
Deferred Annuities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	898	794
Structured Settlements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	240	208
Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	240	208
Fair Value, Inputs, Level 2 [Member] | Structured Settlements [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	240	208
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	898	794
Fair Value, Inputs, Level 3 [Member] | Deferred Annuities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value of life insurance liabilities	$ 898	$ 794