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FAIR VALUE DISCLOSURES (UNREALIZED GAINS (LOSSES) FOR LEVEL 3 STILL HELD) (Details) - Level 3 Assets And Liabilities Still Held - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Corporate    
Change in Accounting Estimate [Line Items]    
OCI $ 11 $ 5
State and Political Sub- divisions    
Change in Accounting Estimate [Line Items]    
OCI   1
Commercial Mortgage- backed    
Change in Accounting Estimate [Line Items]    
OCI (12) 12
Asset-backed Securities    
Change in Accounting Estimate [Line Items]    
OCI 0 (1)
Total Debt Maturities Available For Sale    
Change in Accounting Estimate [Line Items]    
Investment Gains (Losses), Net 7 8
Increase (Decrease) in the Fair Value of the Reinsurance Contract Asset 1,637 690
OCI (1) 17
Policy- holders’ Benefits 81 (39)
Gmib Reinsurance    
Change in Accounting Estimate [Line Items]    
Increase (Decrease) in the Fair Value of the Reinsurance Contract Asset 1,637 690
Separate Accounts Assets    
Change in Accounting Estimate [Line Items]    
Investment Gains (Losses), Net 7 8
GWBL and Other Features’ Liability    
Change in Accounting Estimate [Line Items]    
Policy- holders’ Benefits $ 81 $ (39)