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Discontinued Operations (Tables)
12 Months Ended
Dec. 31, 2012
Discontinued Operations [Abstract]  
Summarized Results of Discontinued Operations
           
           
Summarized Results of Discontinued Operations        
   Years Ended December 31,
   2012 2011 2010
           
   (Millions)
Revenues$ - $ 3,997 $ 4,042
           
Income (loss) from discontinued operations before gain on        
 reconsolidation, impairments and income taxes $ (16) $ 223 $ 350
Gain on reconsolidation  144   -   -
Impairments  -   (755)   (1,682)
(Provision) benefit for income taxes   8   115   139
Income (loss) from discontinued operations $ 136 $ (417) $ (1,193)
           
Income (loss) from discontinued operations:        
 Attributable to noncontrolling interests $ - $ 10 $ 8
 Attributable to The Williams Companies, Inc. $ 136 $ (427) $ (1,201)
           
           
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Text Block]
          
 Discontinued Operations     
          
      Year ended  
     December 31, 2011 Classification
          
      (Millions)  
Designated as cash flow hedges     
          
 Net gain (loss) recognized in other comprehensive      
  income (loss) (effective portion) $ 413 AOCI
          
 Net gain (loss) reclassified from accumulated other     Income (loss) from
  comprehensive income (loss) into income    discontinued
  (effective portion)  $ 332 operations
          
Not designated as cash flow hedges     
         Income (loss) from
         discontinued
 Gain (loss) recognized in income $ 30 operations
          
          

     Years ended December 31,  
    2012 2011Classification
            
      (Millions)  
Net gain (loss) recognized in other comprehensive         
 income (loss) (effective portion) $ 30 $ (18) AOCI
            
Net gain (loss) reclassified from accumulated other         
 comprehensive income (loss) into income       Product Sales or
 (effective portion)  $ 30 $ (18) Product Costs