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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Employee Benefit Plans [Abstract]  
Changes in benefit obligations and plan assets [Table Text Block]
     Other
     Postretirement
   Pension Benefits Benefits
   2012 2011 2012 2011
              
   (Millions)
Change in benefit obligation:            
 Benefit obligation at beginning of year $ 1,441 $ 1,267 $ 339 $ 289
 Service cost   39   41   3   2
 Interest cost   55   64   13   15
 Plan participants’ contributions   -   -   5   6
 Benefits paid   (75)   (66)   (20)   (22)
 Medicare Part D and Early Retiree Reinsurance Program subsidies   -   -   3   4
 Plan amendment   -   -   (6)   (3)
 Actuarial loss (gain)   98   143   (6)   48
 Settlements   (9)   (8)   -   -
 Benefit obligation at end of year   1,549   1,441   331   339
Change in plan assets:            
 Fair value of plan assets at beginning of year   965   971   159   162
 Actual return on plan assets   111   -   18   (2)
 Employer contributions   79   68   13   15
 Plan participants’ contributions   -   -   5   6
 Benefits paid   (75)   (66)   (20)   (22)
 Settlements   (9)   (8)   -   -
 Fair value of plan assets at end of year   1,071   965   175   159
Funded status - underfunded $ (478) $ (476) $ (156) $ (180)
Accumulated benefit obligation $ 1,519 $ 1,415      
Underfunded status of our pension plans and other postretirement benefit plans [Table Text Block]
   December 31,
   2012 2011
        
   (Millions)
Underfunded pension plans:      
 Current liabilities $3 $7
 Noncurrent liabilities  475  469
Underfunded other postretirement benefit plans:      
 Current liabilities  8  8
 Noncurrent liabilities  148  172
Pre-tax amounts not yet recognized in net periodic benefit cost [Table Text Block]
      Other
      Postretirement
    Pension Benefits Benefits
    2012 2011 2012 2011
               
    (Millions)
Amounts included in accumulated other comprehensive loss:            
  Prior service (cost) credit $ (1) $ (2) $ 7 $ 8
  Net actuarial loss   (828)   (835)   (35)   (40)
Amounts included in net regulatory assets associated with our             
 FERC-regulated gas pipelines:            
  Prior service credit  N/A  N/A $ 14 $ 14
  Net actuarial loss  N/A  N/A   (67)   (85)
Componenets of net periodic benefit cost [Table Text Block]
      Other
    Pension Benefits Postretirement Benefits
    2012 2011 2010 2012 2011 2010
                     
    (Millions)
Components of net periodic benefit cost:                  
  Service cost $ 39 $ 41 $ 35 $ 3 $ 2 $ 2
  Interest cost   55   64   64   13   15   15
  Expected return on plan assets   (64)   (77)   (71)   (9)   (10)   (9)
  Amortization of prior service cost (credit)   1   1   1   (7)   (11)   (14)
  Amortization of net actuarial loss   53   38   35   8   3   3
  Net actuarial loss from settlements   5   4   -   -   -   -
  Amortization of regulatory asset   -   -   -   -   1   1
Net periodic benefit cost $ 89 $ 71 $ 64 $ 8 $ - $ (2)
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) [Table Text Block]
      Other
    Pension Benefits Postretirement Benefits
    2012 2011 2010 2012 2011 2010
    (Millions)
Other changes in plan assets and benefit obligations                 
 recognized in other comprehensive income (loss):                 
  Net actuarial gain (loss)$ (51) $ (220) $ (71) $ 2 $ (21) $ (12)
  Prior service credit  -   -   -   2   2   -
  Amortization of prior service cost (credit)  1   1   1   (3)   (4)   (5)
  Amortization of net actuarial loss and loss                  
   from settlements  58   42   35   3   1   1
Other changes in plan assets and benefit obligations                 
 recognized in other comprehensive income (loss).........$ 8 $ (177) $ (35) $ 4 $ (22) $ (16)
                     
Pre-tax amounts expected to be amortized in net periodic benefit cost [Table Text Block]
     Other
   Pension Postretirement
   Benefits Benefits
            
   (Millions)
Amounts included in accumulated other comprehensive loss:         
  Prior service cost (credit) $ 1   $ (3) 
  Net actuarial loss   60     3 
Amounts included in net regulatory assets associated with our FERC-         
 regulated gas pipelines:         
  Prior service credit  N/A   $ (5) 
  Net actuarial loss  N/A     6 
Weighted average assumptions utilized to determine benefit obligations [Table Text Block]
     Other
     Postretirement
 Pension Benefits Benefits
 2012 2011 2012 2011
Discount rate3.43% 3.98% 3.77% 4.22%
Rate of compensation increase 4.57  4.52  N/A  N/A
Weighted average assumptions utilized to determine net periodic benefit cost [Table Text Block]
   Other
 Pension Benefits Postretirement Benefits
 2012 2011 2010 2012 2011 2010
Discount rate3.98% 5.19% 5.78% 4.22% 5.35% 5.80%
Expected long-term rate of return on plan assets 6.30  7.50  7.50  5.71  6.54  6.51
Rate of compensation increase 4.52  5.00  5.00  N/A  N/A  N/A
One percentage point change in assumed health care cost trend rates effects [Table Text Block]
 Point increase Point decrease
          
 (Millions)
Effect on total of service and interest cost components $ 2   $ (2) 
Effect on other postretirement benefit obligation   46     (38) 
Fair values of pension plan assets [Table Text Block]
     2012
     Level 1 Level 2 Level 3 Total
                
     (Millions)
Pension assets:            
 Cash management fund (1) $ 21 $ - $ - $ 21
 Equity securities:            
  U.S. large cap   169   -   -   169
  U.S. small cap   115   -   -   115
  International developed markets large cap growth   1   61   -   62
  Emerging markets growth   3   18   -   21
  Preferred stock   6   -   -   6
 Commingled investment funds:            
  Equities - U.S. large cap (2)   -   146   -   146
  Equities - Emerging markets value (3)   -   33   -   33
  Equities - International developed markets large cap value (4)   -   83   -   83
  Fixed income - Corporate bonds (5)   -   150   -   150
 Fixed income securities (6):            
  U.S. Treasury securities   22   -   -   22
  Mortgage-backed securities   -   68   -   68
  Corporate bonds   -   171   -   171
 Insurance company investment contracts and other   -   4   -   4
   Total assets at fair value at December 31, 2012 $ 337 $ 734 $ - $ 1,071

     2011
     Level 1 Level 2 Level 3 Total
                
     (Millions)
Pension assets:            
 Cash management fund (1) $ 43 $ - $ - $ 43
 Equity securities:            
  U.S. large cap   170   -   -   170
  U.S. small cap   121   -   -   121
  International developed markets large cap growth   4   57   -   61
  Emerging markets growth   3   9   -   12
 Commingled investment funds:            
  Equities - U.S. large cap (2)   -   147   -   147
  Equities - Emerging markets value (3)   -   27   -   27
  Equities - International developed markets large cap value (4)   -   69   -   69
  Fixed income - Corporate bonds (5)   -   58   -   58
 Fixed income securities (6):            
  U.S. Treasury securities   16   -   -   16
  Mortgage-backed securities   -   65   -   65
  Corporate bonds   -   169   -   169
 Insurance company investment contracts and other   -   7   -   7
   Total assets at fair value at December 31, 2011 $ 357 $ 608 $ - $ 965
Fair values of other postretirement benefit plan assets [Table Text Block]
     2012
     Level 1 Level 2 Level 3 Total
                
     (Millions)
Other postretirement benefit assets:            
 Cash management funds (1) $ 14 $ - $ - $ 14
 Equity securities:            
  U.S. large cap   42   -   -   42
  U.S. small cap   21   -   -   21
  International developed markets large cap growth   -   13   -   13
  Emerging markets growth   1   4   -   5
  Preferred stock   1   -   -   1
 Commingled investment funds:            
  Equities - U.S. large cap (2)   -   15   -   15
  Equities - Emerging markets value (3)   -   3   -   3
  Equities - International developed markets large cap value (4)   -   9   -   9
  Fixed income - Corporate bonds (5)   -   15   -   15
 Fixed income securities (7):            
  U.S. Treasury securities   2   -   -   2
  Government and municipal bonds   -   10   -   10
  Mortgage-backed securities   -   7   -   7
  Corporate bonds   -   18   -   18
   Total assets at fair value at December 31, 2012 $ 81 $ 94 $ - $ 175
                

     2011
     Level 1 Level 2 Level 3 Total
                
     (Millions)
Other postretirement benefit assets:            
 Cash management funds (1) $ 16 $ - $ - $ 16
 Equity securities:            
  U.S. large cap   42   -   -   42
  U.S. small cap   20   -   -   20
  International developed markets large cap growth   1   12   -   13
  Emerging markets growth   1   1   -   2
 Commingled investment funds:            
  Equities - U.S. large cap (2)   -   15   -   15
  Equities - Emerging markets value (3)   -   3   -   3
  Equities - International developed markets large cap value (4)   -   7   -   7
  Fixed income - Corporate bonds (5)   -   6   -   6
 Fixed income securities (7):            
  U.S. Treasury securities   2   -   -   2
  Government and municipal bonds   -   10   -   10
  Mortgage-backed securities   -   6   -   6
  Corporate bonds   -   17   -   17
   Total assets at fair value at December 31, 2011 $ 82 $ 77 $ - $ 159
                
Expected benefit payments and subsidy receipts [Table Text Block]
        Federal
      Other Prescription
  Pension Postretirement Drug
  Benefits Benefits Subsidy
               
  (Millions)
2013  $ 77  $ 16   $ (2) 
2014    86    17     (3) 
2015    92    18     (3) 
2016    97    18     (3) 
2017    103    19     (3) 
2018-2022    591    107     (18)