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Earnings (Loss) Per Common Share from Continuing Operations (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings (loss) per common share from continuing operations        
Income (loss) from continuing operations attributable to The Williams Companies, Inc. available to common stockholders for basic and diluted earnings (loss) per common share $ 143 $ 152 $ 454 $ 572
Basic weighted-average shares 683,274 626,809 682,744 613,888
Diluted weighted-average shares 687,306 632,019 687,007 619,765
Earnings (loss) per common share from continuing operations:        
Basic $ 0.21 $ 0.25 $ 0.66 $ 0.94
Diluted $ 0.20 $ 0.25 $ 0.66 $ 0.93
Nonvested restricted stock units [Member]
       
Effect of dilutive securities:        
Incremental common shares attributable to share-based payment arrangements under effects of dilutive securities item 1,901 2,490 1,975 2,721
Stock options [Member]
       
Effect of dilutive securities:        
Incremental common shares attributable to share-based payment arrangements under effects of dilutive securities item 2,113 2,535 2,169 2,695
Convertible debentures [Member]
       
Effect of dilutive securities:        
Incremental dilutive shares, Convertible debt 18 185 119 461