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FAIR VALUE DISCLOSURES (UNREALIZED GAINS (LOSSES) FOR LEVEL 3 STILL HELD) (Details) - Level 3 - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Corporate        
Change in Accounting Estimate [Line Items]        
Investment Gains (Losses), Net $ 0 $ 1 $ 0 $ 0
Other comprehensive income (loss) (51) (1) (6) 8
State and Political Sub- divisions        
Change in Accounting Estimate [Line Items]        
Other comprehensive income (loss) 0 1 0 1
Commercial Mortgage- backed        
Change in Accounting Estimate [Line Items]        
Investment Gains (Losses), Net (9) (18) (20) (24)
Other comprehensive income (loss) 7 1 19 (11)
Asset-backed Securities        
Change in Accounting Estimate [Line Items]        
Investment Gains (Losses), Net 15   15  
Other comprehensive income (loss) (11) 2 (7) 2
Gmib Reinsurance        
Change in Accounting Estimate [Line Items]        
Increase (Decrease) in the Fair Value of the Reinsurance Contract Asset 1,446 1,065 906 2,662
Policyholders’ benefits     0  
Equity Method Investments        
Change in Accounting Estimate [Line Items]        
Investment Gains (Losses), Net 0 (1) 0 (1)
Other comprehensive income (loss)   0 0 0
Separate Accounts Assets        
Change in Accounting Estimate [Line Items]        
Investment Gains (Losses), Net 8 5 18 13
Other comprehensive income (loss)     0 0
GWBL and Other Features’ Liability        
Change in Accounting Estimate [Line Items]        
Policyholders’ benefits (48) 10 (166) 40
Assets and Liabilities Still Held | Corporate        
Change in Accounting Estimate [Line Items]        
Other comprehensive income (loss) (45) (2) (4) 9
Assets and Liabilities Still Held | State and Political Sub- divisions        
Change in Accounting Estimate [Line Items]        
Other comprehensive income (loss) 0 1 0 1
Assets and Liabilities Still Held | Commercial Mortgage- backed        
Change in Accounting Estimate [Line Items]        
Other comprehensive income (loss) 5 (4) 17 (16)
Assets and Liabilities Still Held | Asset-backed Securities        
Change in Accounting Estimate [Line Items]        
Other comprehensive income (loss) (11) 2 (7) 2
Assets and Liabilities Still Held | Fixed Maturities, Available-for-Sale [Member]        
Change in Accounting Estimate [Line Items]        
Other comprehensive income (loss) (51) (3) 6 (4)
Assets and Liabilities Still Held | Total Debt Maturities Available For Sale        
Change in Accounting Estimate [Line Items]        
Investment Gains (Losses), Net 8 6 18 13
Increase (Decrease) in the Fair Value of the Reinsurance Contract Asset 1,495 1,104 981 2,733
Other comprehensive income (loss) (51) (3) 6 (4)
Policyholders’ benefits 15 65 (43) 146
Assets and Liabilities Still Held | Gmib Reinsurance        
Change in Accounting Estimate [Line Items]        
Increase (Decrease) in the Fair Value of the Reinsurance Contract Asset 1,495 1,104 981 2,733
Assets and Liabilities Still Held | Separate Accounts Assets        
Change in Accounting Estimate [Line Items]        
Investment Gains (Losses), Net 8 6 18 13
Assets and Liabilities Still Held | GWBL and Other Features’ Liability        
Change in Accounting Estimate [Line Items]        
Policyholders’ benefits $ 15 $ 65 $ (43) $ 146