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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Employee Benefit Plans [Abstract]    
Changes in benefit obligations and plan assets [Table Text Block]
     Other
     Postretirement
   Pension Benefits Benefits
   2011 2010 2011 2010
              
   (Millions)
Change in benefit obligation:            
 Benefit obligation at beginning of year $ 1,267 $ 1,118 $ 289 $ 259
 Service cost   41   35   2   2
 Interest cost   64   64   15   15
 Plan participants’ contributions   -   -   6   6
 Benefits paid   (66)   (58)   (22)   (24)
 Medicare Part D and Early Retiree Reinsurance Program subsidies   -   -   4   2
 Plan amendment   -   -   (3)   (1)
 Actuarial loss   143   108   48   30
 Settlements   (8)   -   -   -
 Benefit obligation at end of year   1,441   1,267   339   289
Change in plan assets:            
 Fair value of plan assets at beginning of year   971   860   162   148
 Actual return on plan assets   -   108   (2)   17
 Employer contributions   68   61   15   15
 Plan participants’ contributions   -   -   6   6
 Benefits paid   (66)   (58)   (22)   (24)
 Settlements   (8)   -   -   -
 Fair value of plan assets at end of year   965   971   159   162
Funded status - underfunded $ (476) $ (296) $ (180) $ (127)
Accumulated benefit obligation $ 1,415 $ 1,224      
  
Underfunded status of our pension plans and other postretirement benefit plans [Table Text Block]
   December 31,
   2011 2010
        
   (Millions)
Underfunded pension plans:      
 Current liabilities $7 $7
 Noncurrent liabilities  469  289
Underfunded other postretirement benefit plans:      
 Current liabilities  8  8
 Noncurrent liabilities  172  119
  
Pre-tax amounts not yet recognized in net periodic benefit expense [Table Text Block]
      Other
      Postretirement
    Pension Benefits Benefits
    2011 2010 2011 2010
               
    (Millions)
Amounts included in accumulated other comprehensive loss:            
  Prior service (cost) credit $ (2) $ (3) $ 8 $ 10
  Net actuarial loss   (835)   (657)   (40)   (20)
Amounts included in net regulatory assets associated with our             
 FERC-regulated gas pipelines:            
  Prior service credit  N/A  N/A $ 14 $ 20
  Net actuarial loss  N/A  N/A   (85)   (48)
  
Componenets of net periodic benefit expense [Table Text Block]
      Other
    Pension Benefits Postretirement Benefits
    2011 2010 2009 2011 2010 2009
                     
    (Millions)
Components of net periodic benefit expense:                  
  Service cost $ 41 $ 35 $ 32 $ 2 $ 2 $ 2
  Interest cost   64   64   62   15   15   16
  Expected return on plan assets   (77)   (71)   (61)   (10)   (9)   (9)
  Amortization of prior service cost (credit)   1   1   1   (11)   (14)   (11)
  Amortization of net actuarial loss   38   35   43   3   3   3
  Net actuarial loss from settlements   4   -   -   -   -   -
  Amortization of regulatory asset   -   -   1   1   1   5
Net periodic benefit expense $ 71 $ 64 $ 78 $ - $ (2) $ 6
  
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) [Table Text Block]
      Other
    Pension Benefits Postretirement Benefits
    2011 2010 2009 2011 2010 2009
                     
    (Millions)
Other changes in plan assets and benefit obligations                 
 recognized in other comprehensive income (loss):                 
  Net actuarial (gain) loss$ 220 $ 71 $ (44) $ 21 $ 12 $ 1
  Prior service credit  -   -   -   (2)   -   (7)
  Amortization of prior service (cost) credit  (1)   (1)   (1)   4   5   4
  Amortization of net actuarial loss and loss                  
   from settlements  (42)   (35)   (43)   (1)   (1)   -
Other changes in plan assets and benefit obligations                 
 recognized in other comprehensive income (loss).........  177   35   (88)   22   16   (2)
                     
Total recognized in net periodic benefit expense and                 
 other comprehensive income (loss)$ 248 $ 99 $ (10) $ 22 $ 14 $ 4
  
Pre-tax amounts expected to be amortized in net periodic benefit expense [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   53     3 
Amounts included in net regulatory assets associated with our FERC-         
 regulated gas pipelines:         
  Prior service credit  N/A   $ (4) 
  Net actuarial loss  N/A     7 
  
Weighted average assumptions utilized to determine benefit obligations [Table Text Block]
     Other
     Postretirement
 Pension Benefits Benefits
 2011 2010 2011 2010
Discount rate3.98% 5.20% 4.22% 5.35%
Rate of compensation increase 4.52  5.00  N/A  N/A
  
Weighted average assumptions utilized to determine net periodic benefit expense [Table Text Block]
   Other
 Pension Benefits Postretirement Benefits
 2011 2010 2009 2011 2010 2009
Discount rate5.19% 5.78% 6.08% 5.35% 5.80% 6.00%
Expected long-term rate of return on plan assets 7.50  7.50  7.75  6.54  6.51  7.00
Rate of compensation increase 5.00  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   47     (39) 
  
Fair values of pension plan assets [Table Text Block]
     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
     2010
     Level 1 Level 2 Level 3 Total
                
     (Millions)
Pension assets:            
 Cash management fund (1) $ 30 $ - $ - $ 30
 Equity securities:            
  U.S. large cap   192   -   -   192
  U.S. small cap   137   -   -   137
  International developed markets large cap growth   4   68   -   72
  Emerging markets growth   4   12   -   16
 Commingled investment funds:            
  Equities - U.S. large cap (2)   -   168   -   168
  Equities - Emerging markets value (3)   -   35   -   35
  Equities - International developed markets large cap value (4)   -   80   -   80
 Fixed income securities (6):            
  U.S. Treasury securities   17   3   -   20
  Mortgage-backed securities   -   64   -   64
  Corporate bonds   -   150   -   150
 Insurance company investment contracts and other   -   7   -   7
   Total assets at fair value at December 31, 2010 $ 384 $ 587 $ - $ 971
Fair values of other postretirement benefit plan assets [Table Text Block]
     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
                
     2010
     Level 1 Level 2 Level 3 Total
                
     (Millions)
Other postretirement benefit assets:            
 Cash management funds (1) $ 15 $ - $ - $ 15
 Equity securities:            
  U.S. large cap   44   -   -   44
  U.S. small cap   24   -   -   24
  International developed markets large cap growth   1   14   -   15
  Emerging markets growth   1   2   -   3
 Commingled investment funds:            
  Equities - U.S. large cap (2)   -   17   -   17
  Equities - Emerging markets value (3)   -   3   -   3
  Equities - International developed markets large cap value (4)   -   8   -   8
 Fixed income securities (7):            
  U.S. Treasury securities   2   -   -   2
  Government and municipal bonds   -   10   -   10
  Mortgage-backed securities   -   6   -   6
  Corporate bonds   -   15   -   15
   Total assets at fair value at December 31, 2010 $ 87 $ 75 $ - $ 162
                
Expected benefit payments and subsidy receipts [Table Text Block]
        Federal
      Other Prescription
  Pension Postretirement Drug
  Benefits Benefits Subsidy
               
  (Millions)
2012  $ 74  $ 17   $ (2) 
2013    76    17     (2) 
2014    88    18     (2) 
2015    92    19     (3) 
2016    98    20     (3) 
2017-2021    576    111     (16)