Consolidated Statement of Income (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Revenues	$ 1,933	$ 1,999	$ 5,627	$ 6,094
Costs and expenses:
Operating and maintenance expenses	336	364	993	1,091
Depreciation and amortization expenses	426	435	1,285	1,275
Selling, general, and administrative expenses	114	130	354	410
Impairment of certain assets (Note 12)	0	0	0	76
Impairment of goodwill (Note 12)	0	0	187	0
Other (income) expense – net	15	(11)	28	30
Total costs and expenses	1,292	1,371	3,943	4,407
Operating income (loss)	641	628	1,684	1,687
Equity earnings (losses) (Note 5)	106	93	236	260
Impairment of equity-method investments (Note 12)	0	(114)	(938)	(186)
Other investing income (loss) – net (Note 5)	2	7	6	132
Interest incurred	(298)	(303)	(898)	(915)
Interest capitalized	6	7	16	27
Other income (expense) – net	(23)	1	(14)	19
Income (loss) before income taxes	434	319	92	1,024
Provision (benefit) for income taxes	111	77	24	244
Net income (loss)	323	242	68	780
Less: Net income (loss) attributable to noncontrolling interests	14	21	(27)	54
Net income (loss) attributable to The Williams Companies, Inc.	309	221	95	726
Preferred stock dividends	1	1	2	2
Net income (loss) available to common stockholders	$ 308	$ 220	$ 93	$ 724
Basic earnings (loss) per common share:
Net income (loss)	$ 0.25	$ 0.18	$ 0.08	$ 0.60
Weighted-average shares (thousands)	1,213,912	1,212,270	1,213,512	1,211,938
Diluted earnings (loss) per common share:
Net income (loss)	$ 0.25	$ 0.18	$ 0.08	$ 0.60
Weighted-average shares (thousands)	1,215,335	1,214,165	1,214,757	1,213,943
Service [Member]
Revenues:
Revenues	$ 1,479	$ 1,495	$ 4,399	$ 4,424
NonRegulated Service Commodity Consideration [Member]
Revenues:
Revenues	40	38	93	158
Product [Member]
Revenues:
Revenues	414	466	1,135	1,512
Oil and Gas, Purchased [Member]
Costs and expenses:
Product costs	380	434	1,047	1,442
Natural Gas Purchased For Shrink [Member]
Costs and expenses:
Product costs	$ 21	$ 19	$ 49	$ 83