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Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2011
Benefit Plans (Tables) [Abstract]  
Health Care Trend Rates
 Health Care Trend Rates 2011 2010
 Initial  7.50%  8.00%
 Ultimate  5.00%  5.00%
 Year Ultimate Reached 2016 2016
Effect of a 1% change in assumed health care cost trend rates for the OPEB Health Care Plans
  1% Increase 1% Decrease
  (in millions)
 Effect on Total Service and Interest Cost     
  Components of Net Periodic Postretirement Health     
  Care Benefit Cost$ 23 $ (18)
       
 Effect on the Health Care Component of the     
  Accumulated Postretirement Benefit Obligation  274   (223)
Reconciliation of Changes in Benefit Obligations and Fair Value of Assets
    Other Postretirement
  Pension Plans Benefit Plans
  2011 2010 2011 2010
Change in Benefit Obligation (in millions)
Benefit Obligation at January 1 $ 4,807 $ 4,701 $ 2,125 $ 1,941
Service Cost   72   111   42   47
Interest Cost   237   253   109   113
Actuarial Loss   169   222   253   164
Plan Amendment Prior Service Credit   -   -   (196)   (36)
Curtailment   -   -   1   -
Benefit Payments   (294)   (480)   (150)   (142)
Participant Contributions   -   -   34   29
Medicare Subsidy   -   -   9   9
Benefit Obligation at December 31 $ 4,991 $ 4,807 $ 2,227 $ 2,125
             
Change in Fair Value of Plan Assets            
Fair Value of Plan Assets at January 1 $ 3,858 $ 3,403 $ 1,461 $ 1,308
Actual Gain (Loss) on Plan Assets   282   420   (14)   149
Company Contributions   457   515   79   117
Participant Contributions   -   -   34   29
Benefit Payments   (294)   (480)   (150)   (142)
Fair Value of Plan Assets at December 31 $ 4,303 $ 3,858 $ 1,410 $ 1,461
             
Underfunded Status at December 31 $ (688) $ (949) $ (817) $ (664)
Benefit Amounts Recognized on the Balance Sheets
Benefit Amounts Recognized on the Balance Sheets as of December 31, 2011 and 2010
               
      Other Postretirement
    Pension Plans Benefit Plans
               
    December 31,
   2011 2010 2011 2010
    (in millions)
 Other Current Liabilities - Accrued Short-term            
  Benefit Liability $ (8) $ (8) $ (4) $ (4)
 Employee Benefits and Pension Obligations -            
  Accrued Long-term Benefit Liability   (680)   (941)   (813)   (660)
 Underfunded Status $ (688) $ (949) $ (817) $ (664)
Amounts Included in AOCI and Regulatory Assets
Amounts Included in AOCI and Regulatory Assets as of December 31, 2011 and 2010
  
     Other Postretirement
  Pension Plans Benefit Plans
   December 31,
   2011 2010 2011 2010 
Components (in millions)
Net Actuarial Loss $ 2,208 $ 2,129 $ 979 $ 638 
Prior Service Cost (Credit)   10   11   (210)   (20) 
Transition Obligation   -   -   1   3 
               
Recorded as             
Regulatory Assets $ 1,818 $ 1,764 $ 479 $ 388 
Deferred Income Taxes   140   132   102   81 
Net of Tax AOCI   260   244   189   152 
Components of Change in Amounts Included in AOCI and Regulatory Assets
    Other Postretirement
  Pension Plans Benefit Plans
  Years Ended December 31,
  2011 2010 2011 2010
Components (in millions)
Actuarial Loss During the Year $ 201 $ 121 $ 370 $ 121
Prior Service Credit   -   -   (191)   (36)
Amortization of Actuarial Loss   (122)   (89)   (29)   (29)
Amortization of Prior Service Credit (Cost)   (1)   -   1   -
Amortization of Transition Obligation   -   -   (2)   (27)
Change for the Year $ 78 $ 32 $ 149 $ 29
Accumulated Benefit Obligation
   December 31,
 Accumulated Benefit Obligation 2011 2010
   (in millions)
 Qualified Pension Plan $ 4,808 $ 4,659
 Nonqualified Pension Plans   89   80
 Total $ 4,897 $ 4,739
Underfunded Accumulated Benefit Obligation
   Underfunded Pension Plans
   December 31,
   2011 2010
   (in millions)
 Projected Benefit Obligation $ 4,991 $ 4,807
        
 Accumulated Benefit Obligation $ 4,897 $ 4,739
 Fair Value of Plan Assets   4,303   3,858
 Underfunded Accumulated Benefit Obligation $ (594) $ (881)
Estimated Future Benefit Payments and Contributions
   Pension Plans Other Postretirement Benefit Plans
   Pension Benefit Medicare Subsidy
   Payments Payments Receipts
   (in millions)
 2012 $ 327 $145 $ 9
 2013   334  148   -
 2014   354  153   -
 2015   356  160   -
 2016   360  168   -
 Years 2017 to 2021, in Total   1,864  955   2
Components of Net Periodic Benefit Cost
      Other Postretirement
   Pension Plans Benefit Plans
    Years Ended December 31,
    2011 2010 2009 2011 2010 2009
    (in millions)
 Service Cost $ 72 $ 111 $ 104 $ 42 $ 47 $ 42
 Interest Cost   237   253   254   109   113   110
 Expected Return on Plan Assets   (314)   (312)   (321)   (109)   (105)   (80)
 Curtailment   -   -   -   1   -   -
 Amortization of Transition Obligation   -   -   -   2   27   27
 Amortization of Prior Service Cost (Credit)   1   -   -   (1)   -   -
 Amortization of Net Actuarial Loss   122   89   59   29   29   42
 Net Periodic Benefit Cost   118   141   96   73   111   141
 Capitalized Portion   (37)   (44)   (30)   (22)   (35)   (44)
 Net Periodic Benefit Cost Recognized as                  
  Expense $ 81 $ 97 $ 66 $ 51 $ 76 $ 97
Estimated Amounts to be Amortized to Net Periodic Benefit Costs
     Other
      Postretirement
    Pension Plans Benefit Plans
 Components (in millions)
 Net Actuarial Loss $ 145 $ 59
 Prior Service Credit   (1)   (18)
 Transition Obligation   -   1
 Total Estimated 2012 Amortization $ 144 $ 42
        
 Expected to be Recorded as      
 Regulatory Asset $ 116 $ 25
 Deferred Income Taxes   10   6
 Net of Tax AOCI   18   11
 Total $ 144 $ 42
Pension Plans [Member]
  
Benefit Plans (Tables) [Abstract]  
Assets with Fair Value Hierarchy
                     Year End
 Asset Class Level 1 Level 2 Level 3 Other Total Allocation
                       
   (in millions)   
 Equities:                  
  Domestic $ 1,455 $ - $ - $ - $ 1,455  33.8%
  International   399   -   -   -   399  9.3%
  Real Estate Investment Trusts   104   -   -   -   104  2.4%
  Common Collective Trust -                  
   International   -   128   -   -   128  3.0%
 Subtotal - Equities   1,958   128   -   -   2,086  48.5%
                    
 Fixed Income:                  
  Common Collective Trust - Debt   -   26   -   -   26  0.6%
  United States Government and                  
   Agency Securities   -   566   -   -   566  13.2%
  Corporate Debt   -   985   6   -   991  23.0%
  Foreign Debt   -   190   -   -   190  4.4%
  State and Local Government   -   48   -   -   48  1.1%
  Other - Asset Backed   -   26   -   -   26  0.6%
 Subtotal - Fixed Income   -   1,841   6   -   1,847  42.9%
                    
 Real Estate   -   -   163   -   163  3.8%
                    
 Alternative Investments   -   -   161   -   161  3.7%
 Securities Lending   -   215   -   -   215  5.0%
 Securities Lending Collateral (a)   -   -   -   (236)   (236)  (5.5)%
                    
 Cash and Cash Equivalents   -   93   -   -   93  2.2%
 Other - Pending Transactions and                  
  Accrued Income (b)   -   -   -   (26)   (26)  (0.6)%
                    
 Total $ 1,958 $ 2,277 $ 330 $ (262) $ 4,303  100.0%

  • Amounts in "Other" column primarily represent an obligation to repay cash collateral received as part of the Securities Lending Program.
  • Amounts in "Other" column primarily represent accrued interest, dividend receivables and transactions pending settlement.

                     Year End
 Asset Class Level 1 Level 2 Level 3 Other Total Allocation
                       
   (in millions)   
 Equities:                  
  Domestic $ 1,350 $ 2 $ - $ - $ 1,352  35.1%
  International   403   -   -   -   403  10.4%
  Real Estate Investment Trusts   112   -   -   -   112  2.9%
  Common Collective Trust -                  
   International   -   163   -   -   163  4.2%
 Subtotal - Equities   1,865   165   -   -   2,030  52.6%
                    
 Fixed Income:                  
  United States Government and                  
   Agency Securities   -   634   -   -   634  16.4%
  Corporate Debt   -   672   -   -   672  17.4%
  Foreign Debt   -   127   -   -   127  3.3%
  State and Local Government   -   23   -   -   23  0.6%
  Other - Asset Backed   -   51   -   -   51  1.3%
 Subtotal - Fixed Income   -   1,507   -   -   1,507  39.0%
                    
 Real Estate   -   -   83   -   83  2.2%
                    
 Alternative Investments   -   -   130   -   130  3.4%
 Securities Lending   -   254   -   -   254  6.6%
 Securities Lending Collateral (a)   -   -   -   (276)   (276)  (7.1)%
                    
 Cash and Cash Equivalents (b)   -   127   -   2   129  3.3%
 Other - Pending Transactions and                  
  Accrued Income (c)   -   -   -   1   1  -%
                    
 Total $ 1,865 $ 2,053 $ 213 $ (273) $ 3,858  100.0%

(a) Amounts in "Other" column primarily represent an obligation to repay cash collateral received as part of the Securities Lending Program.

(b) Amounts in "Other" column primarily represent foreign currency holdings.

(c) Amounts in "Other" column primarily represent accrued interest, dividend receivables and transactions pending settlement.
Pension Plan Assets Level 3 Reconciliation
    Corporate Real Alternative Total
    Debt Estate Investments Level 3
    (in millions)
 Balance as of January 1, 2011 $ - $ 83 $ 130 $ 213
 Actual Return on Plan Assets            
  Relating to Assets Still Held as of the Reporting Date   -   22   9   31
  Relating to Assets Sold During the Period   -   -   3   3
 Purchases and Sales   -   58   19   77
 Transfers into Level 3   6   -   -   6
 Transfers out of Level 3   -   -   -   -
 Balance as of December 31, 2011 $ 6 $ 163 $ 161 $ 330

      Alternative Total
    Real Estate Investments Level 3
    (in millions)
 Balance as of January 1, 2010 $ 90 $ 106 $ 196
 Actual Return on Plan Assets         
  Relating to Assets Still Held as of the Reporting Date   (7)   4   (3)
  Relating to Assets Sold During the Period   -   1   1
 Purchases and Sales   -   19   19
 Transfers into Level 3   -   -   -
 Transfers out of Level 3   -   -   -
 Balance as of December 31, 2010 $ 83 $ 130 $ 213
Other Postretirement Benefit Plans [Member]
  
Benefit Plans (Tables) [Abstract]  
Assets with Fair Value Hierarchy
                     Year End
 Asset Class Level 1 Level 2 Level 3 Other Total Allocation
                       
   (in millions)   
 Equities:                  
  Domestic $ 348 $ - $ - $ - $ 348  24.7%
  International   380   -   -   -   380  27.0%
  Common Collective Trust -                  
   Global   -   99   -   -   99  7.0%
 Subtotal - Equities   728   99   -   -   827  58.7%
                    
 Fixed Income:                  
  Common Collective Trust - Debt   -   69   -   -   69  4.9%
  United States Government and                  
   Agency Securities   -   81   -   -   81  5.7%
  Corporate Debt   -   152   -   -   152  10.8%
  Foreign Debt   -   32   -   -   32  2.3%
  State and Local Government   -   9   -   -   9  0.6%
  Other - Asset Backed   -   2   -   -   2  0.1%
 Subtotal - Fixed Income   -   345   -   -   345  24.4%
                    
 Trust Owned Life Insurance:                  
  International Equities   -   46   -   -   46  3.3%
  United States Bonds   -   158   -   -   158  11.2%
                    
 Cash and Cash Equivalents   17   23   -   -   40  2.9%
 Other - Pending Transactions and                  
  Accrued Income (a)   -   -   -   (6)   (6)  (0.5)%
                    
 Total $ 745 $ 671 $ - $ (6) $ 1,410  100.0%

  • Amounts in "Other" column primarily represent accrued interest, dividend receivables and transactions pending settlement.

                     Year End
 Asset Class Level 1 Level 2 Level 3 Other Total Allocation
                       
   (in millions)
 Equities:                  
  Domestic $ 584 $ - $ - $ - $ 584  40.0%
  International   220   -   -   -   220  15.1%
  Common Collective Trust -                  
   Global   -   115   -   -   115  7.9%
 Subtotal - Equities   804   115   -   -   919  63.0%
                    
 Fixed Income:                  
  Common Collective Trust - Debt   -   48   -   -   48  3.3%
  United States Government and                  
   Agency Securities   -   93   -   -   93  6.4%
  Corporate Debt   -   110   -   -   110  7.5%
  Foreign Debt   -   25   -   -   25  1.7%
  State and Local Government   -   3   -   -   3  0.2%
  Other - Asset Backed   -   1   -   -   1  0.1%
 Subtotal - Fixed Income   -   280   -   -   280  19.2%
                    
 Trust Owned Life Insurance:                  
  International Equities   -   49   -   -   49  3.3%
  United States Bonds   -   163   -   -   163  11.1%
                    
 Cash and Cash Equivalents (a)   21   25   -   1   47  3.2%
 Other - Pending Transactions and                  
  Accrued Income (b)   -   -   -   3   3  0.2%
                    
 Total $ 825 $ 632 $ - $ 4 $ 1,461  100.0%

(a) Amounts in "Other" column primarily represent foreign currency holdings.

(b) Amounts in "Other" column primarily represent accrued interest, dividend receivables and transactions pending settlement.
Benefit Obligations [Member]
  
Benefit Plans (Tables) [Abstract]  
Actuarial Assumptions
      Other Postretirement
   Pension Plans  Benefit Plans
 Assumptions 2011  2010  2011 2010
 Discount Rate  4.55%   5.05%   4.75%  5.25%
 Rate of Compensation Increase  4.85%(a)  4.95%(a) NA NA

(a)       Rates are for base pay only. In addition, an amount is added to reflect target incentive compensation for exempt employees and overtime and incentive pay for nonexempt employees.

NA Not applicable

 
Benefit Costs [Member]
  
Benefit Plans (Tables) [Abstract]  
Actuarial Assumptions
      Other Postretirement
    Pension Plans Benefit Plans
   2011 2010 2009 2011 2010 2009
 Discount Rate  5.05%  5.60%  6.00%  5.25%  5.85%  6.10%
 Expected Return on Plan Assets  7.75%  8.00%  8.00%  7.50%  8.00%  7.75%
 Rate of Compensation Increase  4.85%  4.60%  5.90% NA NA NA
                    
 NA Not Applicable