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Pension and Other Postretirement Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
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)2015201420152014
Change in benefit obligation        
Benefit obligation, January 1$ 5,269$ 4,700$ 335$ 323
Service cost  2  2  -  -
Interest cost  194  206  11  12
(Gain) loss from past experience  (239)  679  (19)  31
Effect of plan amendment  -  2  -  -
Benefits paid from plan assets  (270)  (291)  (3)  (5)
Benefits paid — other  (22)  (29)  (29)  (26)
Benefit obligation, December 31  4,934  5,269  295  335
Change in plan assets        
Fair value of plan assets, January 1  4,170  4,089  12  16
Actual return on plan assets  75  257  (1)  1
Benefits paid  (270)  (291)  (3)  (5)
Contributions  6  115  -  -
Fair value of plan assets, December 31  3,981  4,170  8  12
Funded Status$ (953)$ (1,099)$ (287)$ (323)
Postretirement benefits liability adjustment included in AOCI
 Pension Other
 BenefitsPostretirement Benefits
(In millions)2015201420152014
Unrecognized net gain (loss) $ (2,201)$ (2,317)$ 1$ (16)
Unrecognized prior service cost  (7)  (7)  52  54
Postretirement benefits liability adjustment$ (2,208)$ (2,324)$ 53$ 38
Assumptions for pension and other postretirement benefit plans
  20152014
Discount rate:   
Pension benefit obligation 4.17%3.75%
Other postretirement benefit obligation 3.89%3.50%
Pension benefit cost 3.75%4.50%
Other postretirement benefit cost 3.50%4.00%
Expected long-term return on plan assets:   
Pension benefit cost 7.25%7.25%
Other postretirement benefit cost 5.00%5.00%
    
Expected benefit payments, including expected future services
     
     
 Pension Other Postretirement
(In millions)BenefitsBenefits
2016$ 363$ 29
2017$ 322$ 28
2018$ 323$ 27
2019$ 329$ 26
2020$ 322$ 25
2021-2025$ 1,604$ 104
Pension Benefits [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Components of net defined benefit plan costs
(In millions)201520142013
Service cost$ 2$ 2$ 3
Interest cost  194  206  181
Expected long-term return on plan assets  (267)  (264)  (272)
Amortization of:      
Net loss from past experience  70  57  74
Settlement loss  -  6  -
Net pension cost$ (1)$ 7$ (14)
Fair value of pension plan assets
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
Plan assets at fair value:        
Fixed maturities:        
Federal government and agency$ 1$ 1$ -$ 2
Corporate  -  1,026  41  1,067
Mortgage and other asset-backed  -  19  2  21
Fund investments and pooled separate accounts (1)  -  553  3  556
Total fixed maturities  1  1,599  46  1,646
Equity securities:        
Domestic  585  6  86  677
International, including funds and pooled separate accounts (1)  18  358  7  383
Total equity securities  603  364  93  1,060
Real estate, including pooled separate accounts (1)  -  -  362  362
Commercial mortgage loans  -  -  131  131
Securities partnerships  -  -  406  406
Hedge funds  -  -  256  256
Guaranteed deposit account contract  -  -  58  58
Cash equivalents and other current assets, net  -  62  -  62
Total plan assets at fair value$ 604$ 2,025$ 1,352$ 3,981
         
(1) A pooled separate account has several participating benefit plans and each owns a share of the total pool of investments.

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 and other current assets, net  -  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.
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, 2015 $ 121 $ 441 $ 357 $ 283 $ 44 $ 1,246
Actual return on plan assets:            
Assets still held at the reporting date  (3)  58  50  4  1  110
Assets sold during the period  -  -  -  -  -  -
Total actual return on plan assets  (3)  58  50  4  1  110
Purchases, sales, settlements, net  14  (6)  (1)  (31)  13  (11)
Transfers into/out of Level 3  7  -  -  -  -  7
Balance at December 31, 2015$ 139$ 493$ 406$ 256$ 58$ 1,352

(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