Consolidated Statement of Operations (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Revenues	$ 2,283	$ 1,781	$ 4,895	$ 3,694
Costs and expenses:
Operating and maintenance expenses	379	320	739	657
Depreciation and amortization expenses	463	430	901	859
Selling, general, and administrative expenses	114	127	237	240
Impairment of goodwill (Note 10)	0	0	0	187
Other (income) expense – net	12	6	11	13
Total costs and expenses	1,683	1,169	3,556	2,651
Operating income (loss)	600	612	1,339	1,043
Equity earnings (losses) (Note 4)	135	108	266	130
Impairment of equity-method investments (Note 10)	0	0	0	(938)
Other investing income (loss) – net	2	1	4	4
Interest incurred	(301)	(299)	(597)	(600)
Interest capitalized	3	5	5	10
Other income (expense) – net	2	5	0	9
Income (loss) before income taxes	441	432	1,017	(342)
Less: Provision (benefit) for income taxes	119	117	260	(87)
Net income (loss)	322	315	757	(255)
Less: Net income (loss) attributable to noncontrolling interests	18	12	27	(41)
Net income (loss) attributable to The Williams Companies, Inc.	304	303	730	(214)
Less: Preferred stock dividends	0	0	1	1
Net income (loss) available to common stockholders	$ 304	$ 303	$ 729	$ (215)
Basic earnings (loss) per common share:
Net income (loss)	$ 0.25	$ 0.25	$ 0.60	$ (0.18)
Weighted-average shares (thousands)	1,215,250	1,213,601	1,214,950	1,213,310
Diluted earnings (loss) per common share:
Net income (loss)	$ 0.25	$ 0.25	$ 0.60	$ (0.18)
Weighted-average shares (thousands)	1,217,476	1,214,581	1,217,344	1,213,310	[1]
Service [Member]
Revenues:
Revenues	$ 1,460	$ 1,446	$ 2,912	$ 2,920
NonRegulated Service Commodity Consideration [Member]
Revenues:
Revenues	51	25	100	53
Product [Member]
Revenues:
Revenues	772	310	1,883	721
Oil and Gas, Purchased [Member]
Costs and expenses:
Product costs	697	271	1,629	667
Natural Gas Purchased For Shrink [Member]
Costs and expenses:
Product costs	$ 18	$ 15	$ 39	$ 28

[1] For the six months ended June 30, 2020, 1.1 million weighted-average nonvested restricted stock units have been excluded from the computation of diluted earnings (loss) per common share as their inclusion would be antidilutive due to our loss available to common stockholders.