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FAIR VALUE DISCLOSURES (UNREALIZED GAINS (LOSSES) FOR LEVEL 3 STILL HELD) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Level 3 Assets And Liabilities Still Held | Corporate        
Change in Accounting Estimate [Line Items]        
OCI $ (2) $ (5) $ 9 $ (1)
Level 3 Assets And Liabilities Still Held | State and Political Sub- divisions        
Change in Accounting Estimate [Line Items]        
OCI 1 (2) 1 33
Level 3 Assets And Liabilities Still Held | Commercial Mortgage- backed        
Change in Accounting Estimate [Line Items]        
OCI (4) 21 (16) 0
Level 3 Assets And Liabilities Still Held | Asset-backed Securities        
Change in Accounting Estimate [Line Items]        
OCI 2 0 2 (1)
Level 3 Assets And Liabilities Still Held | Total Debt Maturities Available For Sale        
Change in Accounting Estimate [Line Items]        
Investment Gains (Losses), Net 6 9    
Increase (Decrease) in the Fair Value of the Reinsurance Contract Asset 1,104 (1,450)    
OCI (3) 14 (4) 31
Policy- holders’ Benefits 65 (58)    
Level 3 Assets And Liabilities Still Held | Gmib Reinsurance        
Change in Accounting Estimate [Line Items]        
Increase (Decrease) in the Fair Value of the Reinsurance Contract Asset 1,104 (1,450) 2,741 (760)
Level 3 Assets And Liabilities Still Held | Separate Accounts Assets        
Change in Accounting Estimate [Line Items]        
Investment Gains (Losses), Net 6 9 13 17
Level 3 Assets And Liabilities Still Held | GWBL and Other Features’ Liability        
Change in Accounting Estimate [Line Items]        
Policy- holders’ Benefits 65 (58) 146 19
Level 3 | Corporate        
Change in Accounting Estimate [Line Items]        
Investment Gains (Losses), Net 1 1 0 1
OCI (1) (5) 8 (1)
Level 3 | State and Political Sub- divisions        
Change in Accounting Estimate [Line Items]        
OCI 1 (2) 1 (1)
Level 3 | Commercial Mortgage- backed        
Change in Accounting Estimate [Line Items]        
Investment Gains (Losses), Net (18) (18) (24) (20)
OCI 1 21 (11) 34
Level 3 | Asset-backed Securities        
Change in Accounting Estimate [Line Items]        
OCI 2 1 2 0
Level 3 | Total Debt Maturities Available For Sale        
Change in Accounting Estimate [Line Items]        
Investment Gains (Losses), Net     13 17
Increase (Decrease) in the Fair Value of the Reinsurance Contract Asset     2,741 (760)
OCI     (4) 31
Policy- holders’ Benefits     146 19
Level 3 | Gmib Reinsurance        
Change in Accounting Estimate [Line Items]        
Increase (Decrease) in the Fair Value of the Reinsurance Contract Asset 1,065 (1,496) 2,662 (851)
Policy- holders’ Benefits     0  
Level 3 | Equity Method Investments        
Change in Accounting Estimate [Line Items]        
Investment Gains (Losses), Net (1) (8) (1) (13)
OCI   0 0 3
Level 3 | Separate Accounts Assets        
Change in Accounting Estimate [Line Items]        
Investment Gains (Losses), Net 5 0 13 0
OCI     0 0
Level 3 | GWBL and Other Features’ Liability        
Change in Accounting Estimate [Line Items]        
Policy- holders’ Benefits $ 10 $ (103) $ 40 $ (104)