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INVESTMENTS - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
investment
Dec. 31, 2011
investment
Dec. 31, 2010
investment
Schedule of Investments [Line Items]      
Reclassified investments from the held-to-maturity portfolio to the available-for-sale portfolio, number of investments 7 13 6
Reclassified investments from the held-to-maturity portfolio to the available-for-sale portfolio, amortized cost $ 1,200,000,000 $ 2,500,000,000 $ 1,400,000,000
Reclassified investments from the held-to-maturity portfolio to the available-for-sale portfolio, aggregate unrealized gain (loss) 290,000,000 334,000,000 830,000,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 977,000,000 [1] 1,901,000,000 [1] 459,000,000 [2]
Realized investment gains (losses) on sales and redemptions 474,000,000 594,000,000 38,000,000
Perpetual securities, interest coupons that were fixed at issuance subsequently change to a floating short-term interest rate floating short-term interest rate of 125 to more than 300 basis points above an appropriate market index    
Fair value of investments in an unrealized loss position 40,707,000,000 29,310,000,000  
Total Unrealized Losses 1,582,000,000 3,536,000,000  
Percentage that the lending policy requires that the fair value of the securities and/or unrestricted cash received as collateral be of the fair value of the loaned securities 102.00%    
Fair value of debt securities on deposit with regulatory authorities in the United States and Japan 18,000,000    
Banks/financial Institutions
     
Schedule of Investments [Line Items]      
Fair value of investments in an unrealized loss position 8,600,000,000    
Total Unrealized Losses 787,000,000    
Variable Interest Entity, Not Consolidated
     
Schedule of Investments [Line Items]      
Securities available for sale, fixed maturities, fair value 8,350,000,000 7,239,000,000  
Number of issuers of VIEs not-consolidated 153    
Parent Company
     
Schedule of Investments [Line Items]      
Securities available for sale, fixed maturities, fair value 156,000,000 138,000,000  
Investment grade | Banks/financial Institutions
     
Schedule of Investments [Line Items]      
Percentage of unrealized losses attributable to securities that were investment grade 81.00% 80.00%  
Investment grade | Public Utilities
     
Schedule of Investments [Line Items]      
Percentage of unrealized losses attributable to securities that were investment grade 69.00% 77.00%  
Investment grade | Sovereign and Supranational
     
Schedule of Investments [Line Items]      
Percentage of unrealized losses attributable to securities that were investment grade 96.00% 100.00%  
Investment grade | Other Corporate
     
Schedule of Investments [Line Items]      
Percentage of unrealized losses attributable to securities that were investment grade 72.00% 73.00%  
Investment grade | Parent Company
     
Schedule of Investments [Line Items]      
Available-for-sale fixed-maturity securities, amortized cost 131,000,000    
Securities available for sale, fixed maturities, fair value 156,000,000    
Below Investment Grade | Banks/financial Institutions
     
Schedule of Investments [Line Items]      
Fair value of investments in an unrealized loss position 608,000,000    
Total Unrealized Losses 146,000,000    
Number of Issuers 2    
Percentage of unrealized losses attributable to a certain number of securities 99.00%    
Perpetual securities
     
Schedule of Investments [Line Items]      
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 243,000,000 565,000,000 160,000,000
Fair value of investments in an unrealized loss position 1,451,000,000 2,507,000,000  
Total Unrealized Losses 170,000,000 633,000,000  
Unrealized Gain (Loss) 89,000,000 (458,000,000)  
Maturity date (in years) 25 years    
Perpetual securities | Lower Limit
     
Schedule of Investments [Line Items]      
Perpetual securities, floating short-term interest rate basis point above market index 1.25%    
Perpetual securities | Minimum Upper Limit
     
Schedule of Investments [Line Items]      
Perpetual securities, floating short-term interest rate basis point above market index 3.00%    
Perpetual securities | Investment grade
     
Schedule of Investments [Line Items]      
Percentage of unrealized losses attributable to securities that were investment grade 100.00% 73.00%  
Credit-related impairment
     
Schedule of Investments [Line Items]      
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 597,000,000 1,286,000,000  
Change in intent impairment
     
Schedule of Investments [Line Items]      
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 353,000,000 615,000,000  
Severity and duration of decline in fair value impairment
     
Schedule of Investments [Line Items]      
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 27,000,000    
Tier I | Perpetual securities
     
Schedule of Investments [Line Items]      
Unrealized Gain (Loss) (48,000,000) (434,000,000)  
Tier I | Perpetual securities | A
     
Schedule of Investments [Line Items]      
Unrealized Gain (Loss) 0 0  
Upper Tier II | Perpetual securities
     
Schedule of Investments [Line Items]      
Unrealized Gain (Loss) 94,000,000 (41,000,000)  
Upper Tier II | Perpetual securities | A
     
Schedule of Investments [Line Items]      
Unrealized Gain (Loss) $ 28,000,000 $ (62,000,000)  
[1] Includes $597 and $1,286 for the years ended December 31, 2012 and 2011, respectively, for credit-related impairments; $353 and $615 for the years ended December 31, 2012 and 2011, respectively, from change in intent to sell securities; and $27 for the year ended December 31, 2012 for impairments due to severity and duration of decline in fair value
[2] Consisted completely of credit-related impairments