Acquisitions and Divestitures Divestitures (Tables)

12 Months Ended

Dec. 31, 2019

Four Corners [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Disposal Groups, Including Discontinued Operations [Table Text Block]

The following table presents the results of operations for the Four Corners area, excluding the gain noted above:

	Year Ended December 31,
	2018		2017
	(Millions)
Income (loss) before income taxes of Four Corners area	$	52	$	47
Income (loss) before income taxes of Four Corners area attributable to The Williams Companies, Inc.	43		35

Williams Olefins, LLC [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Disposal Groups, Including Discontinued Operations [Table Text Block]

The following table presents the results of operations for the Geismar Interest, excluding the gain noted above:

	Year Ended December 31,
	2017
	(Millions)
Income (loss) before income taxes of the Geismar Interest	$	26
Income (loss) before income taxes of the Geismar Interest attributable to The Williams Companies, Inc.	19