Consolidated Statement of Operations - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	$ 8,604
Service revenues - commodity consideration (Note 1)	400		$ 0	$ 0
Total revenues	8,686		8,031	7,499
Costs and expenses:
Processing commodity expenses (Note 1)	137		0	0
Operating and maintenance expenses	1,507		1,576	1,592
Depreciation and amortization expenses	1,725		1,736	1,763
Selling, general, and administrative expenses	569		594	722
Impairment of certain assets (Note 17)	1,915		1,248	873
Gain on sale of certain assets (Note 3)	(692)		(1,095)	0
Regulatory Charges resulting From Tax Reform (Note 1)	(17)		674	0
Other (income) expense – net	67		71	135
Total costs and expenses	7,918		7,104	6,810
Operating income (loss)	768		927	689
Equity earnings (losses)	396		434	397
Impairment of equity-method investments (Note 17)	(32)		0	(430)
Other investing income (loss) – net	219		282	63
Interest incurred	(1,160)		(1,116)	(1,217)
Interest capitalized	48		33	38
Other income (expense) – net	92		(25)	85
Income (loss) before income taxes	331		535	(375)
Provision (benefit) for income taxes	138		(1,974)	(25)
Net income (loss)	193		2,509	(350)
Less: Net income (loss) attributable to noncontrolling interests	348		335	74
Amounts attributable to The Williams Companies, Inc.:
Net income (loss) attributable to The Williams Companies, Inc.	(155)		2,174	(424)
Preferred stock dividends (Note 15)	1		0	0
Net income (loss) available to common stockholders	$ (156)		$ 2,174	$ (424)
Basic earnings (loss) per common share:
Net income (loss)	$ (0.16)		$ 2.63	$ (0.57)
Weighted-average shares (thousands)	973,626		826,177	750,673
Diluted earnings (loss) per common share:
Net income (loss)	$ (0.16)		$ 2.62	$ (0.57)
Weighted-average shares (thousands)	973,626	[1]	828,518	750,673	[1]
Service [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	$ 5,502		$ 5,312	$ 5,171
Product [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	2,784		2,719	2,328
Oil and Gas, Purchased [Member]
Costs and expenses:
Product costs	$ 2,707		$ 2,300	$ 1,725

[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.