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Reinsurance Level 4 Reinsurance Recoverable (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Reinsurance Recoverables on Paid Losses $ 119,000,000 $ 133,000,000  
Reinsurance Recoverables on Unpaid Losses, Gross 2,662,000,000 2,868,000,000  
Premiums Receivable, Allowance for Doubtful Accounts (266,000,000) (271,000,000)  
Reinsurance Recoverables 23,189,000,000 22,920,000,000  
Fair Value, Concentration of Risk, Investments 0 0  
Property, Liability and Casualty Insurance Product Line [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Gross reinsurance recoverable 2,781,000,000 3,001,000,000  
Reinsurance Recoverables 2,515,000,000 2,730,000,000 $ 2,735,000,000
Life Insurance Product Line [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Reinsurance Recoverables [1] 20,674,000,000 20,190,000,000  
Life Insurance Product Line [Member] | Continuing Operations [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Reinsurance Recoverables 1,305,000,000 1,193,000,000  
Retirement Plans and Individual Life Businesses [Member] | Life Insurance Product Line [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Reinsurance Recoverables 19,369,000,000 18,997,000,000  
Retirement Plans [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Reinsurance Recoverables 8,600,000,000 8,600,000,000  
Individual Life [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Reinsurance Recoverables 10,800,000,000 $ 10,400,000,000  
Reinsurance Recoverable [Member]      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Fair Value, Concentration of Risk, Investments $ 0    
[1] [1]No allowance for uncollectible reinsurance is required as of December 31, 2015 and December 31, 2014.