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Penson and Other Postretirement Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2011
Pension And Other Postretirement Benefit Expense [Tables] [Abstract]  
Projected benefit obligations and assets related to pension and other postretirement benefits
  Pension  Other Postretirement
  Benefits Benefits
(In millions)2011201020112010
Change in benefit obligation        
Benefit obligation, January 1$ 4,691$ 4,363$ 444$ 419
Service cost  2  2  2  1
Interest cost  228  240  20  22
Loss from past experience  453  379  16  36
Benefits paid from plan assets  (273)  (258)  (2)  (2)
Benefits paid - other  (34)  (35)  (28)  (32)
Benefit obligation, December 31  5,067  4,691  452  444
Change in plan assets        
Fair value of plan assets, January 1  3,163  2,850  23  24
Actual return on plan assets  156  357  1  1
Benefits paid  (273)  (258)  (2)  (2)
Contributions  252  214 -  -
Fair value of plan assets, December 31  3,298  3,163  22  23
Funded Status$ (1,769)$ (1,528)$ (430)$ (421)
Postretirement benefits liability adjustment included in AOCI
 Pension Other
 BenefitsPostretirement Benefits
(In millions)2011201020112010
Unrecognized net gain (loss)$ (2,331)$ (1,805)$ (30)$ (14)
Unrecognized prior service cost  (5)  (5)  35  51
Postretirement benefits liability adjustment$ (2,336)$ (1,810)$ 5$ 37
Components of net pension costs
(In millions)201120102009
Service cost$ 2$ 2$ 43
Interest cost  228  240  250
Expected long-term return on plan assets  (267)  (253)  (239)
Amortization of:      
Net loss from past experience  38  28  34
Prior service cost  -  -  (4)
Curtailment  -  -  (46)
Net pension cost$ 1$ 17$ 38
Components of net other postretirement benefit cost
(In millions)201120102009
Service cost$ 2$ 1$ 1
Interest cost  20  22  24
Expected long-term return on plan assets  (1)  (1)  (1)
Amortization of:      
Net gain from past experience  -  -  (5)
Prior service cost  (16)  (18)  (18)
Net other postretirement benefit cost$ 5$ 4$ 1
Results of a 1% increase or decrease in healthcare benefits estimate range
(In millions)IncreaseDecrease
Effect on total service and interest cost$ 1$ (1)
Effect on postretirement benefit obligation$ 13$ (11)
Fair value of plan assets
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
Plan assets at fair value:        
Fixed maturities:        
Federal government and agency$ -$ 5$ -$ 5
Corporate  -  332  7  339
Mortgage and other asset-backed  -  8  2  10
Fund investments and pooled separate accounts (1)  -  546  3  549
Total fixed maturities  -  891  12  903
Equity securities:        
Domestic  1,153  1  14  1,168
International, including funds and pooled separate accounts (1)  141  137  -  278
Total equity securities  1,294  138  14  1,446
Real estate and mortgage loans, including pooled separate accounts (1)  -  -  303  303
Securities partnerships  -  -  314  314
Hedge funds  -  -  148  148
Guaranteed deposit account contract  -  -  39  39
Cash equivalents   -  145  -  145
Total plan assets at fair value$ 1,294$ 1,174$ 830$ 3,298
         
(1) A pooled separate account has several participating benefit plans and each owns a share of the total pool of investments.

December 31, 2010        
(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$ -$ 8$ -$ 8
Corporate  -  158  24  182
Mortgage and other asset-backed  -  4  -  4
Fund investments and pooled separate accounts (1)  -  372  2  374
Total fixed maturities  -  542  26  568
Equity securities:        
Domestic  1,445  -  20  1,465
International, including funds and pooled separate accounts (1)  208  218  -  426
Total equity securities  1,653  218  20  1,891
Real estate and mortgage loans, including pooled separate accounts (1)  -  -  240  240
Securities partnerships  -  -  347  347
Guaranteed deposit account contract  -  -  24  24
Cash equivalents   -  93  -  93
Total plan assets at fair value$ 1,653$ 853$ 657$ 3,163
         
(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 plan assets
(In millions)Fixed Maturities & Equity SecuritiesReal Estate & Mortgage LoansSecurities PartnershipsHedge FundsGuaranteed Deposit Account ContractTotal
             
Balance at January 1, 2011 $ 46 $ 240 $ 347 $ - $ 24 $ 657
Actual return on plan assets:            
Assets still held at the reporting date  1  44  66  (2)  3  112
Assets sold during the period  18  -  -  -  -  18
Total actual return on plan assets  19  44  66  (2)  3  130
Purchases, sales, settlements, net  (33)  21  (99)  150  12  51
Transfers into/out of Level 3  (6)  (2)  -  -  -  (8)
Balance at December 31, 2011$ 26$ 303$ 314$ 148$ 39$ 830

(In millions)Fixed Maturities & Equity SecuritiesReal Estate & Mortgage LoansSecurities PartnershipsGuaranteed Deposit Account ContractTotal
           
Balance at January 1, 2010 $ 167 $ 160 $ 257 $ 29 $ 613
Actual return on plan assets:          
Assets still held at the reporting date  (15)  16  53  2  56
Assets sold during the period  14  -  -  -  14
Total actual return on plan assets  (1)  16  53  2  70
Purchases, sales, settlements, net  (119)  64  37  (7)  (25)
Transfers into/out of Level 3  (1)  -  -  -  (1)
Balance at December 31, 2010$ 46$ 240$ 347$ 24$ 657
Assumptions for pension and other postretirement benefits
  20112010
Discount rate:   
Pension benefit obligation 4.00%5.00%
Other postretirement benefit obligation 3.75%4.75%
Pension benefit cost 5.00%5.50%
Other postretirement benefit cost 4.75%5.25%
Expected long-term return on plan assets:   
Pension benefit cost 8.00%8.00%
Other postretirement benefit cost 5.00%5.00%
Expected rate of compensation increase:   
Other postretirement benefit obligation 3.00%3.00%
Other postretirement benefit cost 3.00%3.00%
Benefit Payments Expected Over Next Ten Years Table [Text Block]
       
    Other Postretirement
    Benefits
 Pension  Net of Medicare
(In millions)BenefitsGrossPart D Subsidy
2012$ 516$ 43$ 39
2013$ 338$ 41$ 39
2014$ 340$ 40$ 38
2015$ 327$ 39$ 38
2016$ 323$ 38$ 37
2017-2021$ 1,577$ 169$ 162