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Earnings (Loss) Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Earnings (loss) per common share [Table Text Block]
 
Years Ended December 31,
 
2018
 
2017
 
2016
 
(Dollars in millions, except per-share
amounts; shares in thousands)
Net income (loss) available to common stockholders
$
(156
)
 
$
2,174

 
$
(424
)
Basic weighted-average shares
973,626

 
826,177

 
750,673

Effect of dilutive securities:
 
 
 
 
 
Nonvested restricted stock units
—

 
1,704

 
—

Stock options
—

 
637

 
—

Diluted weighted-average shares (1)
973,626

 
828,518

 
750,673

Earnings (loss) per common share:
 
 
 
 
 
Basic
$
(.16
)
 
$
2.63

 
$
(.57
)
Diluted
$
(.16
)
 
$
2.62

 
$
(.57
)

________________
(1)
For the years ended December 31, 2018 and December 31, 2016, 2.0 million and 0.6 million weighted-average nonvested restricted stock units, respectively, and 0.5 million and 0.5 million weighted-average stock options, respectively, have been excluded from the computation of diluted earnings (loss) per common share as their inclusion would be antidilutive due to our loss attributable to The Williams Companies, Inc.