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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value Measurements [Tables] [Abstract]  
Financial assets and liabilities carried at fair value
December 31, 2012        
(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 $ 156$ 746$ -$ 902
State and local government  -  2,437  -  2,437
Foreign government  -  1,298  24  1,322
Corporate   -  11,201  695  11,896
Federal agency mortgage-backed   -  122  -  122
Other mortgage-backed   -  88  1  89
Other asset-backed   -  340  597  937
Total fixed maturities (1)  156  16,232  1,317  17,705
Equity securities   4  73  34  111
Subtotal  160  16,305  1,351  17,816
Short-term investments  -  154  -  154
GMIB assets (2)  -  -  622  622
Other derivative assets (3)  -  41  -  41
Total financial assets at fair value, excluding separate accounts$ 160$ 16,500$ 1,973$ 18,633
Financial liabilities at fair value:        
GMIB liabilities $ -$ -$ 1,170$ 1,170
Other derivative liabilities (3)  -  31  -  31
Total financial liabilities at fair value$ -$ 31$ 1,170$ 1,201
         
(1) Fixed maturities included $875 million of net appreciation required to adjust future policy benefits for the run-off settlement annuity business including $108 million of appreciation for securities classified in Level 3.
        
(2) The GMIB assets represent retrocessional contracts in place from two external reinsurers that cover 55% of the exposures on these contracts. Effective February 4, 2013, the Company reinsured the remaining 45% of 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 $36 million of interest rate swaps not designated as accounting hedges. Other derivative liabilities reflected foreign currency and interest rate swaps qualifying as cash flow hedges. See Note 13 for additional information.
        

December 31, 2011        
(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 $ 217$ 738$ 3$ 958
State and local government  -  2,456  -  2,456
Foreign government  -  1,251  23  1,274
Corporate   -  10,132  381  10,513
Federal agency mortgage-backed   -  9  -  9
Other mortgage-backed   -  79  1  80
Other asset-backed   -  363  564  927
Total fixed maturities (1)  217  15,028  972  16,217
Equity securities   3  67  30  100
Subtotal  220  15,095  1,002  16,317
Short-term investments  -  225  -  225
GMIB assets (2)  -  -  712  712
Other derivative assets (3)  -  45  -  45
Total financial assets at fair value, excluding separate accounts$ 220$ 15,365$ 1,714$ 17,299
Financial liabilities at fair value:        
GMIB liabilities $ -$ -$ 1,333$ 1,333
Other derivative liabilities (3)  -  30  -  30
Total financial liabilities at fair value$ -$ 30$ 1,333$ 1,363
         
(1) Fixed maturities included $826 million of net appreciation required to adjust future policy benefits for the run-off settlement annuity business including $115 million of appreciation for securities classified in Level 3.
        
         
(2) The GMIB assets represent retrocessional contracts in place from two external reinsurers which cover 55% of the exposures on these contracts.
(3) Other derivative assets included $10 million of interest rate and foreign currency swaps qualifying as cash flow hedges and $35 million of interest rate swaps not designated as accounting hedges. Other derivative liabilities reflected foreign currency and interest rate swaps qualifying as cash flow hedges. See Note 13 for additional information.
        
Level 3 financial assets and financial liabilities
 December 31,December 31,
(In millions)20122011
Other asset and mortgage-backed securities - valued using pricing models$ 598$ 565
Corporate and government fixed maturities - valued using pricing models  596  335
Corporate fixed maturities - valued at transaction price  123  72
Equity securities - valued at transaction price  34  30
Total$ 1,351$ 1,002
Level 3 Fair Value And Significant Unobservable Inputs Developed Directly By Company
       
As of December 31, 2012   Unobservable Input Unobservable Adjustment to Discount Rates Range (Weighted Average) in Basis Points
(In millions except basis points) Fair Value  
Other asset and mortgage-backed securities$ 584 Liquidity 60 - 410 (140)
    Weighting of credit spreads 50 - 4,540 (410)
Corporate and government fixed maturities$ 439 Liquidity 20 - 640 (190)
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, 2012 $ 1,002 $ 712 $ (1,333) $ (621)
Gains (losses) included in shareholders' net income:        
GMIB fair value gain/(loss)  -  (55)  96  41
Other  13  -  -  -
Total gains (losses) included in shareholders' net income  13  (55)  96  41
Gains included in other comprehensive income  8  -  -  -
Losses required to adjust future policy benefits for settlement annuities (1)  (10)  -  -  -
Purchases, issuances, settlements:        
Purchases  188  -  -  -
Sales  (1)  -  -  -
Settlements  (88)  (35)  67  32
Total purchases, sales and settlements  99  (35)  67  32
Transfers into/(out of) Level 3:        
Transfers into Level 3  283  -  -  -
Transfers out of Level 3  (44)  -  -  -
Total transfers into/(out of) Level 3  239  -  -  -
Balance at December 31, 2012 $ 1,351 $ 622 $ (1,170) $ (548)
Total gains (losses) included in shareholders' net income attributable         
to instruments held at the reporting date $ (1) $ (55) $ 96 $ 41
         
(1) Amounts do not accrue to shareholders.

 Fixed Maturities & Equity SecuritiesGMIB AssetsGMIB LiabilitiesGMIB Net
(In millions)    
Balance at January 1, 2011 $ 933 $ 480 $ (903) $ (423)
Gains (losses) included in shareholders' net income:        
GMIB fair value gain/(loss)  -  270  (504)  (234)
Other  10  -  -  -
Total gains (losses) included in shareholders' net income  10  270  (504)  (234)
Gains included in other comprehensive income  7  -  -  -
Gains required to adjust future policy benefits for settlement annuities (1)  41  -  -  -
Purchases, issuances, settlements:        
Purchases  129  -  -  -
Sales  (20)  -  -  -
Settlements  (61)  (38)  74  36
Total purchases, sales, and settlements  48  (38)  74  36
Transfers into/(out of) Level 3:        
Transfers into Level 3  81  -  -  -
Transfers out of Level 3  (118)  -  -  -
Total transfers into/(out of) Level 3  (37)  -  -  -
Balance at December 31, 2011 $ 1,002 $ 712 $ (1,333) $ (621)
Total gains (losses) included in shareholders' net income attributable        
to instruments held at the reporting date $ 6 $ 270 $ (504) $ (234)
         
(1) Amounts do not accrue to shareholders.
Separate account assets schedule
2012        
(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 24)$ 245$ 324$ -$ 569
Non-guaranteed separate accounts (1)  1,925  4,258  1,005  7,188
Total separate account assets$ 2,170$ 4,582$ 1,005$ 7,757
         
(1) As of December 31, 2012, non-guaranteed separate accounts included $3.4 billion in assets supporting the Company's pension plans, including $956 million classified in Level 3.
         
2011        
(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 24)$ 249$ 1,439$ -$ 1,688
Non-guaranteed separate accounts (1)  1,804  3,851  750  6,405
Total separate account assets$ 2,053$ 5,290$ 750$ 8,093
         
(1) As of December 31, 2011, non-guaranteed separate accounts included $3.0 billion in assets supporting the Company's pension plans, including $702 million classified in Level 3.
Level 3 separate account assets
(In millions)  
Balance at January 1, 2012$ 750
Policyholder gains (1)  55
Purchases, issuances, settlements:  
Purchases  283
Sales  (6)
Settlements  (90)
Total purchases, sales and settlements  187
Transfers into/(out of) Level 3:  
Transfers into Level 3  17
Transfers out of Level 3  (4)
Total transfers into/(out of) Level 3:  13
Balance at December 31, 2012$ 1,005
   
(1) Included in this amount are gains of $49 million attributable to instruments still held at the reporting date.  
   
(In millions)  
Balance at January 1, 2011$ 594
Policyholder gains (1)  114
Purchases, issuances, settlements:  
Purchases  257
Sales  (51)
Settlements  (152)
Total purchases, sales and settlements  54
Transfers into/(out of) Level 3:  
Transfers into Level 3  4
Transfers out of Level 3  (16)
Total transfers into/(out of) Level 3:  (12)
Balance at December 31, 2011$ 750
   
(1) Included in this amount are gains of $96 million attributable to instruments still held at the reporting date.   
Financial instruments not carried at fair value
(In millions)  December 31, 2012 December 31, 2011
 Classification in Fair Value Hierarchy Fair Value Carrying Value Fair Value Carrying Value
Commercial mortgage loans Level 3$ 2,999$ 2,851$ 3,380$ 3,301
Contractholder deposit funds, excluding universal life productsLevel 3$ 1,082$ 1,056$ 1,056$ 1,035
Long-term debt, including current maturities, excluding capital leasesLevel 2$ 5,821$ 4,986$ 5,319$ 4,984