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Reserves in Addition to Account Balance, Based on Expected No-Lapse Guarantee Benefits and Expected Policy Assessments (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Life policy and investment contract reserves $ 2,310 $ 2,295
Ordinary/Traditional Life
   
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Life policy and investment contract reserves 760 752
Universal Life
   
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Life policy and investment contract reserves 487 483
Deferred Annuities
   
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Life policy and investment contract reserves 852 850
Structured Settlements
   
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Life policy and investment contract reserves 194 193
Other
   
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Life policy and investment contract reserves $ 17 $ 17