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Claim and Claim Adjustment Expense Reserves (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 36 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2010
Loss Portfolio Transfer [Member]
Dec. 31, 2012
Loss Portfolio Transfer [Member]
Aug. 31, 2010
Loss Portfolio Transfer [Member]
Dec. 31, 2009
Loss Portfolio Transfer [Member]
Catastrophe losses net of reinsurance $ 391 $ 222 $ 121        
Net A&EP claim and allocated claim adjustment expense reserves ceded to NICO             1,600
Aggregate limit under A&EP Loss Portfolio Transfer             4,000
Net claim and allocated claim adjustment expense reserves in discontinued operations ceded to NICO under A&EP Loss Portfolio Transfer             90
A&EP claim and allocated claim adjustment expense reserves ceded under existing third party reinsurance contracts transferred to NICO under A&EP Loss Portfolio Transfer             1,200
Reinsurance premium paid to NICO under A&EP Loss Portfolio Transfer           2,000  
Net reinsurance receivables transferrred to NICO under A&EP Loss Portfolio Transfer             215
Allowance for doubtful accounts related to reinsurance receivables transferred to NICO under A&EP Loss Portfolio Transfer             100
Collateral trust established by NICO under A&EP Loss Portfolio Transfer           2,200  
Reduction of allowance for uncollectible reinsurance receivables       200      
Remaining amount available under aggregate limit of the Loss Portfolio Transfer on an incurred basis         2,000    
(Unfavorable) favorable net prior year development 205 423 637   (399)    
Future adverse prior year development to result in retroactive reinsurance gain         230    
Net ultimate paid losses ceded under the Loss Portfolio Transfer         661    
Fair value of collateral trust account established by NICO under A&EP Loss Portfolio Transfer         2,500    
(Unfavorable) favorable net prior year development, Life & Group $ 11 $ 29 $ 2