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Acquisitions and Divestitures (Tables)
 12 Months Ended
Dec. 31, 2017
Williams Olefins, L.L.C. [Member]  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Results of Operations of Disposal Group [Table Text Block]
The following table presents the results of operations for the Geismar Interest, excluding the gain noted above:
 
Years Ended December 31,
 
2017
 
2016
 
(Millions)
Income (loss) before income taxes of the Geismar Interest
$
26

 
$
141

Income (loss) before income taxes of the Geismar Interest attributable to The Williams Companies, Inc.
19

 
85
Canadian Operations [Member]  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Results of Operations of Disposal Group [Table Text Block]
The following table presents the results of operations for the Canadian disposal group, excluding the impairment and loss noted above:
 
Years Ended December 31,
 
2017
 
2016
 
(Millions)
Income (loss) before income taxes of Canadian disposal group
$
—

 
$
(98
)
Income (loss) before income taxes of Canadian disposal group attributable to The Williams Companies, Inc.
—

 
(95
)