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Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Investment [Line Items]  
Impaired commercial mortgage loans and related valuation reserves
(In millions) 2016 2015
  Gross  Reserves Net  Gross  Reserves Net
Impaired commercial mortgage loans with valuation reserves$ 26$ (5)$ 21 $ 113$ (15)$ 98
Impaired commercial mortgage loans with no valuation reserves  -  -  -   -  -  -
Total $ 26$ (5)$ 21 $ 113$ (15)$ 98
Other long-term investments
(In millions)20162015
Real estate investments$ 738$ 814
Securities partnerships  650  501
Other  74  89
Total$ 1,462$ 1,404
Components of pre-tax net investment income
(In millions)201620152014
Fixed maturities$ 899$ 879$ 876
Equity securities  4  3  3
Commercial mortgage loans  91  112  133
Policy loans  72  72  72
Other long-term investments  98  116  105
Short-term investments and cash  26  14  17
Total investment income  1,190  1,196  1,206
Less investment expenses  43  43  40
Net investment income$ 1,147$ 1,153$ 1,166
Realized gains and losses on investments
(In millions)201620152014
Fixed maturities$ 23$ (82)$ 14
Equity securities  (1)  36  13
Commercial mortgage loans  4  (2)  (6)
Other investments, including derivatives  143  105  133
Net realized investment gains, before income taxes  169  57  154
Less income taxes  60  17  48
Net realized investment gains$ 109$ 40$ 106
Pre-tax asset write-downs included in realized gains (losses) on investments
       
(In millions)201620152014
Other-than-temporary impairments on fixed maturities:      
Credit-related$ (19)$ (11)$ -
Non credit-related(1)  (16)  (101)  (36)
Total other-than-temporary impairments on fixed maturities  (35)  (112)  (36)
Other asset write-downs(2)  (23)  (28)  (16)
Total $ (58)$ (140)$ (52)
       
(1) These write-downs pertain to other-than-temporary declines in fair values due to increases in market yields (widening of credit spreads), particularly within the energy sector, for certain below investment grade fixed maturities with an increased probability of sales activity prior to recovery of amortized cost basis.
(2) Other asset write-downs include other-than-temporary declines in the fair values of equity securities, increases in valuation reserves on commercial mortgage loans, and asset write-downs related to security partnerships and real estate investments.
Realized investment gains that are excluded from the Company's revenues
(In millions)201620152014
Separate accounts$ 16$ 117$ 376
Investment gains required to adjust future policy benefits for the run-off settlement annuity business$ 63$ 114$ 86
Sales information for available-for-sale fixed maturities and equity securities
(In millions)201620152014
Proceeds from sales$ 1,544$ 1,555$ 1,769
Gross gains on sales$ 83$ 85$ 62
Gross losses on sales$ 7$ 13$ 6
Fixed Maturities [Member]  
Investment [Line Items]  
Investment maturities
 Amortized Fair
(In millions)CostValue
Due in one year or less$ 1,570$ 1,574
Due after one year through five years  6,481  6,731
Due after five years through ten years  8,036  8,189
Due after ten years  3,394  3,981
Mortgage and other asset-backed securities  461  486
Total$ 19,942$ 20,961
Gross unrealized appreciation (depreciation) on fixed maturities
(In millions)   December 31, 2016  
   UnrealizedUnrealized  
 AmortizedAppre-Depre-Fair
 CostciationciationValue
Federal government and agency$ 658$ 223$ (4)$ 877
State and local government  1,342  99  (6)  1,435
Foreign government  1,998  129  (14)  2,113
Corporate  15,483  716  (149)  16,050
Mortgage and other asset-backed  461  29  (4)  486
Total$ 19,942$ 1,196$ (177)$ 20,961
(In millions) December 31, 2015
Federal government and agency$ 528$ 251$ -$ 779
State and local government  1,496  147  (2)  1,641
Foreign government  1,870  147  (3)  2,014
Corporate  14,022  632  (206)  14,448
Mortgage and other asset-backed  540  41  (8)  573
Total$ 18,456$ 1,218$ (219)$ 19,455
Fixed maturities with a decline in fair value from amortized cost
 Fair Amortized UnrealizedNumber
(Dollars in millions)ValueCostDepreciationof Issues
Fixed maturities:       
One year or less:       
Investment grade$ 4,346$ 4,475$ (129) 992
Below investment grade$ 724$ 736$ (12)591
More than one year:       
Investment grade$ 308$ 327$ (19)53
Below investment grade$ 186$ 203$ (17)28
Commercial Mortgage Loans [Member]  
Investment [Line Items]  
Investment maturities
(In millions) Scheduled Maturities
2017  $ 92
2018    138
2019    251
2020    97
2021 and thereafter    1,088
Total  $ 1,666
Commercial mortgage loans by property type and geographic region
(In millions)20162015
Property type    
Office buildings$ 592$ 697
Apartment buildings  428  366
Industrial  302  322
Hotels   205  259
Retail facilities  139  213
Other  -  7
Total$ 1,666$ 1,864
U.S. geographic region    
Pacific$ 714$ 738
South Atlantic  268  366
New England  227  276
Central   239  205
Middle Atlantic  186  227
Mountain  32  52
Total$ 1,666$ 1,864
Credit risk profile of commercial mortgage loan portfolio
(In millions)Debt Service Coverage Ratio
 December 31, 2016
  1.30x or 1.20x to 1.10x to 1.00x to Less than  
Loan-to-Value Ratio Greater 1.29x 1.19x 1.09x 1.00x Total
Below 50%$ 335$ 15$ -$ -$ -$ 350
50% to 59%  517  46  -  30  -  593
60% to 69%  624  14  -  -  -  638
70% to 79%  -  -  29  -  35  64
80% to 89%  -  -  -  -  -  -
90% to 100%  -  -  -  -  21  21
Total$ 1,476$ 75$ 29$ 30$ 56$ 1,666
 December 31, 2015
Below 50%$ 261$ 2$ -$ 67$ -$ 330
50% to 59%  683  -  -  24  -  707
60% to 69%  590  14  -  19  -  623
70% to 79%  -  -  -  30  36  66
80% to 89%  40  -  -  -  -  40
90% to 100%  -  -  -  -  98  98
Total$ 1,574$ 16$ -$ 140$ 134$ 1,864