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FAIR VALUE DISCLOSURES (UNREALIZED GAINS (LOSSES) FOR LEVEL 3 STILL HELD) (Details) - Level 3 - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Corporate    
Change in Accounting Estimate [Line Items]    
Investment Gains (Losses), Net $ 0 $ 0
OCI 45 10
State and Political Sub- divisions    
Change in Accounting Estimate [Line Items]    
OCI 0 0
Commercial Mortgage- backed    
Change in Accounting Estimate [Line Items]    
Investment Gains (Losses), Net 31 (6)
OCI 12 (12)
Asset-backed Securities    
Change in Accounting Estimate [Line Items]    
OCI 4 0
Gmib Reinsurance    
Change in Accounting Estimate [Line Items]    
Increase (Decrease) in the Fair Value of the Reinsurance Contract Asset (540) 1,598
Policy- holders’ Benefits 0  
Equity Method Investments    
Change in Accounting Estimate [Line Items]    
Investment Gains (Losses), Net 0 0
OCI 0 0
Separate Accounts Assets    
Change in Accounting Estimate [Line Items]    
Investment Gains (Losses), Net 10 7
OCI 0 0
GWBL and Other Features’ Liability    
Change in Accounting Estimate [Line Items]    
Policy- holders’ Benefits (118) 30
Assets and Liabilities Still Held | Corporate    
Change in Accounting Estimate [Line Items]    
OCI 41 11
Assets and Liabilities Still Held | State and Political Sub- divisions    
Change in Accounting Estimate [Line Items]    
OCI 0 0
Assets and Liabilities Still Held | Commercial Mortgage- backed    
Change in Accounting Estimate [Line Items]    
OCI 12 (12)
Assets and Liabilities Still Held | Asset-backed Securities    
Change in Accounting Estimate [Line Items]    
OCI 4 0
Assets and Liabilities Still Held | Fixed Maturities, Available-for-Sale [Member]    
Change in Accounting Estimate [Line Items]    
OCI 57 (1)
Assets and Liabilities Still Held | Total Debt Maturities Available For Sale    
Change in Accounting Estimate [Line Items]    
Investment Gains (Losses), Net 10 7
Increase (Decrease) in the Fair Value of the Reinsurance Contract Asset (514) 1,637
OCI 57 (1)
Policy- holders’ Benefits (58) 81
Assets and Liabilities Still Held | Gmib Reinsurance    
Change in Accounting Estimate [Line Items]    
Increase (Decrease) in the Fair Value of the Reinsurance Contract Asset (514) 1,637
Assets and Liabilities Still Held | Separate Accounts Assets    
Change in Accounting Estimate [Line Items]    
Investment Gains (Losses), Net 10 7
Assets and Liabilities Still Held | GWBL and Other Features’ Liability    
Change in Accounting Estimate [Line Items]    
Policy- holders’ Benefits $ (58) $ 81