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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Financial assets and liabilities carried at fair value
December 31, 2015        
(In millions)Quoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)Total
Financial assets at fair value:        
Fixed maturities:        
Federal government and agency $ 251$ 528$ -$ 779
State and local government  -  1,641  -  1,641
Foreign government  -  2,010  4  2,014
Corporate   -  14,122  326  14,448
Mortgage-backed   -  48  1  49
Other asset-backed   -  198  326  524
Total fixed maturities (1)  251  18,547  657  19,455
Equity securities   32  89  69  190
Subtotal  283  18,636  726  19,645
Short-term investments  -  381  -  381
GMIB assets (2)  -  -  907  907
Other derivative assets (3)  -  16  -  16
Total financial assets at fair value, excluding separate accounts$ 283$ 19,033$ 1,633$ 20,949
GMIB liabilities $ -$ -$ 885$ 885
Total financial liabilities at fair value$ -$ -$ 885$ 885
         
(1) Fixed maturities included $483 million of net cumulative appreciation required to adjust future policy benefits for the run-off settlement annuity business including $30 million of appreciation for securities classified in Level 3. See Note 11 for additional information.
(2) The GMIB assets represented retrocessional contracts in place from three external reinsurers that cover the exposures on these contracts.
(3) Other derivative assets included $15 million of interest rate and foreign currency swaps qualifying as cash flow hedges and $1 million of interest rate swaps qualifying as fair value hedges. See Note 12 for additional information.
         

December 31, 2014        
(In millions)Quoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)Total
Financial assets at fair value:        
Fixed maturities:        
Federal government and agency $ 290$ 664$ -$ 954
State and local government  -  1,856  -  1,856
Foreign government  -  1,936  4  1,940
Corporate   -  13,105  393  13,498
Mortgage-backed   -  84  1  85
Other asset-backed   -  234  416  650
Total fixed maturities (1)  290  17,879  814  18,983
Equity securities   61  85  43  189
Subtotal  351  17,964  857  19,172
Short-term investments  -  163  -  163
GMIB assets (2)  -  -  953  953
Other derivative assets (3)  -  6  -  6
Total financial assets at fair value, excluding separate accounts$ 351$ 18,133$ 1,810$ 20,294
GMIB liabilities $ -$ -$ 929$ 929
Other derivative liabilities   -  1  -  1
Total financial liabilities at fair value$ -$ 1$ 929$ 930
         
(1) Fixed maturities included $756 million of net cumulative appreciation required to adjust future policy benefits for the run-off settlement annuity business including $65 million of appreciation for securities classified in Level 3. See Note 11 for additional information.
(2) The GMIB assets represented retrocessional contracts in place from three external reinsurers that cover the exposures on these contracts.
(3) Other derivative assets included $5 million of interest rate and foreign currency swaps qualifying as cash flow hedges and $1 million of interest rate swaps qualifying as fair value hedges. See Note 12 for additional information.
Level 3 fixed maturities and equity securities priced using significant unobservable inputs
       
As of December 31, 2015   Unobservable Input Unobservable Adjustment Range (Weighted Average)
(Fair value in millions ) Fair Value  
Fixed maturities:      
Other asset and mortgage-backed securities$327 Liquidity 60 - 440 (200)
    Weighting of credit spreads 170 - 630 (220)
Corporate and government fixed maturities 285 Liquidity 70 - 930 (280)
Total fixed maturities 612    
Equity securities 69 Price-to-earnings multiples 4.2 - 11.6 (8.3)
Subtotal 681    
Securities not priced by the Company(1) 45    
Total Level 3 securities$726    
(1) The fair values for these securities use single, unadjusted non-binding broker quotes not developed directly by the Company.

       
As of December 31, 2014   Unobservable Input Unobservable Adjustment Range (Weighted Average)
(Fair value in millions) Fair Value  
Fixed maturities:      
Other asset and mortgage-backed securities$417 Liquidity 60 - 370 (140) bps
    Weighting of credit spreads 160 - 2,560 (290) bps
Corporate and government fixed maturities 344 Liquidity 80 - 930 (262) bps
Total fixed maturities 761    
Equity securities 43 Price-to-earnings multiples 4.2 - 9.8 (8.1)
Subtotal 804    
Securities not priced by the Company(1) 53    
Total Level 3 securities$857    
(1) The fair values for these securities use single, unadjusted non-binding broker quotes not developed directly by the Company.
       
Changes in level 3 financial assets and liabilities carried at fair value
 Fixed Maturities & Equity SecuritiesGMIB AssetsGMIB LiabilitiesGMIB Net
(In millions)    
Balance at January 1, 2015 $ 857 $ 953 $ (929) $ 24
Gains (losses) included in shareholders' net income:        
GMIB fair value gain/(loss)  -  (5)  2  (3)
Other  24  1  -  1
Total gains (losses) included in shareholders' net income  24  (4)  2  (2)
Losses included in other comprehensive income  (11)  -  -  -
Losses required to adjust future policy benefits for settlement annuities (1)  (1)  -  -  -
Purchases, sales, settlements:        
Purchases  153  -  -  -
Sales  (230)  -  -  -
Settlements  (21)  (42)  42  -
Total purchases, sales and settlements  (98)  (42)  42  -
Transfers into/(out of) Level 3:        
Transfers into Level 3  49  -  -  -
Transfers out of Level 3  (94)  -  -  -
Total transfers into/(out of) Level 3  (45)  -  -  -
Balance at December 31, 2015 $ 726 $ 907 $ (885) $ 22
Total gains (losses) included in shareholders' net income attributable         
to instruments held at the reporting date $ (6) $ (4) $ 2 $ (2)
         
(1) Amounts do not accrue to shareholders.

 Fixed Maturities & Equity SecuritiesGMIB AssetsGMIB LiabilitiesGMIB Net
(In millions)    
Balance at January 1, 2014 $ 1,190 $ 751 $ (741) $ 10
Gains (losses) included in shareholders' net income:        
GMIB fair value gain/(loss)  -  251  (251)  -
Other  15  (1)  15  14
Total gains (losses) included in shareholders' net income  15  250  (236)  14
Gains included in other comprehensive income  14  -  -  -
Gains required to adjust future policy benefits for settlement annuities (1)  55  -  -  -
Purchases, sales, settlements:        
Purchases  101  -  -  -
Sales  (202)  -  -  -
Settlements  (156)  (48)  48  -
Total purchases, sales and settlements  (257)  (48)  48  -
Transfers into/(out of) Level 3:        
Transfers into Level 3  165  -  -  -
Transfers out of Level 3  (325)  -  -  -
Total transfers into/(out of) Level 3  (160)  -  -  -
Balance at December 31, 2014 $ 857 $ 953 $ (929) $ 24
Total gains (losses) included in shareholders' net income attributable        
to instruments held at the reporting date $ 2 $ 250 $ (236) $ 14
         
(1) Amounts do not accrue to shareholders.
Separate account assets schedule
2015        
(In millions)Quoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)Total
Guaranteed separate accounts (See Note 23)$ 235$ 274$ -$ 509
Non-guaranteed separate accounts (1)  1,401  4,698  1,225  7,324
Total separate account assets$ 1,636$ 4,972$ 1,225$ 7,833
         
(1) As of December 31, 2015, non-guaranteed separate accounts included $3.6 billion in assets supporting the Company's pension plans, including $1.2 billion classified in Level 3.
         
2014        
(In millions)Quoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)Total
Guaranteed separate accounts (See Note 23)$ 242$ 288$ -$ 530
Non-guaranteed separate accounts (1)  1,609  5,031  1,158  7,798
Total separate account assets$ 1,851$ 5,319$ 1,158$ 8,328
         
(1) As of December 31, 2014, non-guaranteed separate accounts included $3.8 billion in assets supporting the Company's pension plans, including $1.1 billion classified in Level 3.
Changes in level 3 separate account assets
(In millions) 2015 2014
Balance at January 1$ 1,158$ 1,035
Policyholder gains (1)  95  85
Purchases, issuances, settlements:    
Purchases  198  266
Sales  -  (2)
Settlements  (230)  (226)
Total purchases, sales and settlements  (32)  38
Transfers into/(out of) Level 3:    
Transfers into Level 3  16  20
Transfers out of Level 3  (12)  (20)
Total transfers into/(out of) Level 3:  4  -
Balance at December 31$ 1,225$ 1,158
     
(1) Included in this amount were gains of $95 million attributable to instruments still held at December 31, 2015 and gains of $85 million attributable to instruments still held at December 31, 2014.
Financial instruments not carried at fair value
(In millions)  December 31, 2015 December 31, 2014
 Classification in Fair Value Hierarchy Fair Value Carrying Value Fair Value Carrying Value
Commercial mortgage loans Level 3$ 1,911$ 1,864$ 2,168$ 2,081
Contractholder deposit funds, excluding universal life productsLevel 3$ 1,151$ 1,148$ 1,136$ 1,124
Long-term debt, including current maturities, excluding capital leasesLevel 2$ 5,515$ 5,020$ 5,740$ 4,967