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Divestitures (Tables)
 9 Months Ended
Sep. 30, 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.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
(Millions)
Income (loss) before income taxes of the Geismar Interest
$
1

 
$
61

 
$
26

 
$
109

Income (loss) before income taxes of the Geismar Interest attributable to The Williams Companies, Inc.
1

 
36

 
19

 
65
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 Canada disposal group, excluding the impairment and loss noted above.
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
(Millions)
Income (loss) before income taxes of the Canadian disposal group
$
—

 
$
(9
)
 
$
—

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

 
(16
)
 
—

 
(95
)