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INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
investment
Jun. 30, 2014
USD ($)
investment
Mar. 31, 2014
USD ($)
investment
Sep. 30, 2015
USD ($)
investment
issuer
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Schedule of Investments [Line Items]              
Amortized Cost $ 62,222       $ 62,222   $ 60,844
Available-for-sale securities, equity securities 131       $ 131   28
Held to Maturity Securities Transferred to Available for Sale Securities Number of Investments | investment   1 1 1 0    
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net [1] 137 $ 0     $ 143 $ 31  
Reclassified investments from the held-to-maturity portfolio to the available-for-sale portfolio, amortized cost   233 $ 128 $ 63   $ 233  
Reclassified investments from the held-to-maturity portfolio to the available-for-sale portfolio, aggregate unrealized gain (loss)   $ (18) $ (28) $ (8)      
Middle Market Loan Receivable 66       66    
Middle Market Loan Program Unfunded Amount 49       49    
Middle Market Loan Program Allocation $ 233       $ 233    
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%       102.00%    
Available-for-sale Securities $ 67,403       $ 67,403   68,270
Parent Company and Other Business Segments              
Schedule of Investments [Line Items]              
Securities available for sale, fixed maturities, amortized cost 500       500    
Securities available for sale, fixed maturities, fair value 515       515    
Variable Interest Entity, Not Consolidated              
Schedule of Investments [Line Items]              
Securities available for sale, fixed maturities, amortized cost 5,792       5,792   6,104
Securities available for sale, fixed maturities, fair value 6,367       $ 6,367   6,937
Number of issuers of VIEs not-consolidated | issuer         175    
Perpetual Securities Matured or Called [Member]              
Schedule of Investments [Line Items]              
Amortized Cost             361
Available-for-sale Securities             387
Bank loans              
Schedule of Investments [Line Items]              
Securities available for sale, fixed maturities, amortized cost 1,300       $ 1,300   501
Securities available for sale, fixed maturities, fair value 1,300       1,300   $ 579
Yen-denominated | Exchange traded funds              
Schedule of Investments [Line Items]              
Available-for-sale securities, equity securities $ 103       $ 103    
[1] Includes $6 and $0 for the three-month periods and $12 and $31 for the nine-month periods ended September 30, 2015 and 2014, respectively, from change in intent to sell securities; and $131 for the three- and nine-month periods ended September 30, 2015, for credit-related impairment