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Fair Value Measurements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of assets priced with broker quotes and other non-observable market inputs for the fair value measurements and disclosures $ 26   $ 26    
Fair value of senior debt 799   799   783
Principal amount 793   793   793
Note payable 49   49   49
Life reserves and liabilities for deferred annuities and other investment contracts 1,005   1,005   930
Fair value deferred annuities and investment contracts 968   968   933
Net increase (decrease) in Level 3 securities due to net transfer between Level 3 and Level 2   (2)   (6)  
Level 3 securities purchased 7   7    
Transfers out of Level 3 to Level 2 3   14    
Life policy loans book value 2,148   2,148   2,034
Debt Securities | Corporate | Fair Value, Inputs, Level 3
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Net increase (decrease) in Level 3 securities due to net transfer between Level 3 and Level 2 4   (12)    
Number of securities purchased 1   1    
Level 3 securities purchased 7        
Number of securities transferred from Level 3 to Level 2 2   4    
Transfers out of Level 3 to Level 2 3        
Maximum
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Percentage of Levle 3 assets measured at fair value 1.00%   1.00%    
Life Policy
         
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
The fair value of life policy loans outstanding principal and interest 45   45    
Life policy loans book value $ 38   $ 38