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Penson and Other Postretirement Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Projected benefit obligations and assets
  Pension  Other Postretirement
  Benefits Benefits
(In millions)2014201320142013
Change in benefit obligation        
Benefit obligation, January 1$ 4,700$ 5,267$ 323$ 442
Service cost  2  3  -  1
Interest cost  206  181  12  12
(Gain) loss from past experience  679  (464)  31  (37)
Effect of plan amendment  2  -  -  (57)
Benefits paid from plan assets  (291)  (262)  (5)  (3)
Benefits paid - other  (29)  (25)  (26)  (28)
Curtailment  -  -  -  (7)
Benefit obligation, December 31  5,269  4,700  335  323
Change in plan assets        
Fair value of plan assets, January 1  4,089  3,665  16  20
Actual return on plan assets  257  488  1  (1)
Benefits paid  (291)  (262)  (5)  (3)
Contributions  115  198  -  -
Fair value of plan assets, December 31  4,170  4,089  12  16
Funded Status$ (1,099)$ (611)$ (323)$ (307)
Postretirement benefits liability adjustment included in AOCI
 Pension Other
 BenefitsPostretirement Benefits
(In millions)2014201320142013
Unrecognized net gain (loss) $ (2,317)$ (1,696)$ (16)$ 14
Unrecognized prior service cost  (7)  (5)  54  57
Postretirement benefits liability adjustment$ (2,324)$ (1,701)$ 38$ 71
Fair value of pension plan assets
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
Plan assets at fair value:        
Fixed maturities:        
Federal government and agency$ 1$ 1$ -$ 2
Corporate  -  1,025  35  1,060
Mortgage and other asset-backed  -  21  3  24
Fund investments and pooled separate accounts (1)  -  744  3  747
Total fixed maturities  1  1,791  41  1,833
Equity securities:        
Domestic  640  5  73  718
International, including funds and pooled separate accounts (1)  131  241  7  379
Total equity securities  771  246  80  1,097
Real estate, including pooled separate accounts (1)  -  -  331  331
Commercial mortgage loans  -  -  110  110
Securities partnerships  -  -  357  357
Hedge funds  -  -  283  283
Guaranteed deposit account contract  -  -  44  44
Cash equivalents   -  115  -  115
Total plan assets at fair value$ 772$ 2,152$ 1,246$ 4,170
         
(1) A pooled separate account has several participating benefit plans and each owns a share of the total pool of investments.
         
Assumptions for pension and other postretirement benefit plans
  20142013
Discount rate:   
Pension benefit obligation 3.75%4.50%
Other postretirement benefit obligation 3.50%4.00%
Pension benefit cost 4.50%3.50%
Other postretirement benefit cost 4.00%3.25%
Expected long-term return on plan assets:   
Pension benefit cost 7.25%8.00%
Other postretirement benefit cost 5.00%5.00%
    
Expected benefit payments, including expected future services
     
     
 Pension Other Postretirement
(In millions)BenefitsBenefits
2015$ 399$ 31
2016$ 334$ 30
2017$ 336$ 29
2018$ 337$ 28
2019$ 338$ 27
2020-2024$ 1,631$ 115
     
Pension Benefits [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Components of net pension and other postretirement benefit costs
(In millions)201420132012
Service cost$ 2$ 3$ 3
Interest cost  206  181  198
Expected long-term return on plan assets  (264)  (272)  (270)
Amortization of:      
Net loss from past experience  57  74  58
Settlement loss  6  -  6
Net pension cost$ 7$ (14)$ (5)
Fair value of pension plan assets
December 31, 2013        
(In millions)Quoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)Total
Plan assets at fair value:        
Fixed maturities:        
Federal government and agency$ -$ 2$ -$ 2
Corporate  -  725  24  749
Mortgage and other asset-backed  -  18  5  23
Fund investments and pooled separate accounts (1)  -  1,019  3  1,022
Total fixed maturities  -  1,764  32  1,796
Equity securities:        
Domestic  824  -  35  859
International, including funds and pooled separate accounts (1)  187  124  7  318
Total equity securities  1,011  124  42  1,177
Real estate, including pooled separate accounts (1)  -  -  251  251
Commercial mortgage loans  -  -  88  88
Securities partnerships  -  -  304  304
Hedge funds  -  -  360  360
Guaranteed deposit account contract  -  -  44  44
Cash equivalents   -  69  -  69
Total plan assets at fair value$ 1,011$ 1,957$ 1,121$ 4,089
         
(1) A pooled separate account has several participating benefit plans and each owns a share of the total pool of investments.
Changes in Level 3 pension plan assets
(In millions)Fixed Maturities & Equity SecuritiesReal Estate & Mortgage LoansSecurities PartnershipsHedge FundsGuaranteed Deposit Account ContractTotal
             
Balance at January 1, 2014 $ 74 $ 339 $ 304 $ 360 $ 44 $ 1,121
Actual return on plan assets:            
Assets still held at the reporting date  1  41  40  17  2  101
Assets sold during the period  -  -  -  -  -  -
Total actual return on plan assets  1  41  40  17  2  101
Purchases, sales, settlements, net  44  61  13  (94)  (2)  22
Transfers into/out of Level 3  2  -  -  -  -  2
Balance at December 31, 2014$ 121$ 441$ 357$ 283$ 44$ 1,246

(In millions)Fixed Maturities & Equity SecuritiesReal Estate & Mortgage LoansSecurities PartnershipsHedge FundsGuaranteed Deposit Account ContractTotal
             
Balance at January 1, 2013 $ 44 $ 352 $ 328 $ 327 $ 47 $ 1,098
Actual return on plan assets:            
Assets still held at the reporting date  -  29  16  38  1  84
Assets sold during the period  7  -  -  -  -  7
Total actual return on plan assets  7  29  16  38  1  91
Purchases, sales, settlements, net  25  (42)  (40)  (5)  (4)  (66)
Transfers into/out of Level 3  (2)  -  -  -  -  (2)
Balance at December 31, 2013$ 74$ 339$ 304$ 360$ 44$ 1,121
Other Postretirement Benefits [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Components of net pension and other postretirement benefit costs
(In millions)201420132012
Service cost$ -$ 1$ 2
Interest cost  12  12  16
Expected long-term return on plan assets  -  (1)  (1)
Amortization of:      
Prior service cost  (3)  (4)  (12)
Curtailment gain  -  (19)  -
Net other postretirement benefit cost$ 9$ (11)$ 5