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Earnings (Loss) Per Common Share from Continuing Operations (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Earnings (loss) per common share from continuing operations [Table Text Block]
 
Years Ended December 31,
 
2015
 
2014
 
2013
 
(Dollars in millions, except per-share
amounts; shares in thousands)
Income (loss) from continuing operations attributable to The Williams Companies, Inc. available to common stockholders for basic and diluted earnings (loss) per common share
$
(571
)
 
$
2,110

 
$
441

Basic weighted-average shares
749,271

 
719,325

 
682,948

Effect of dilutive securities:
 
 
 
 
 
Nonvested restricted stock units
—

 
2,234

 
1,995

Stock options
—

 
2,064

 
2,149

Convertible debentures
—

 
18

 
93

Diluted weighted-average shares (1)
749,271

 
723,641

 
687,185

Earnings (loss) per common share from continuing operations:
 
 
 
 
 
Basic
$
(.76
)
 
$
2.93

 
$
0.65

Diluted
$
(.76
)
 
$
2.91

 
$
0.64


 
(1)
For the year ended December 31, 2015, 1.7 million weighted-average nonvested restricted stock units and 1.5 million weighted-average stock options have been excluded from the computation of diluted earnings (loss) per common share as their inclusion would be antidilutive due to our loss from continuing operations attributable to The Williams Companies, Inc.