Consolidated Statement of Income (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,034	$ 2,068
Service revenues – commodity consideration	64	101
Total revenues	2,054	2,088
Costs and expenses:
Processing commodity expenses	40	35
Operating and maintenance expenses	340	357
Depreciation and amortization expenses	416	431
Selling, general, and administrative expenses	128	132
Other (income) expense – net	44	29
Total costs and expenses	1,493	1,597
Operating income (loss)	561	491
Equity earnings (losses)	80	82
Impairment of equity-method investments (Note 2)	(74)	0
Other investing income (loss) – net	1	4
Interest incurred	(306)	(282)
Interest capitalized	10	9
Other income (expense) – net	11	21
Income (loss) before income taxes	283	325
Provision (benefit) for income taxes	69	55
Net income (loss)	214	270
Less: Net income (loss) attributable to noncontrolling interests	19	118
Net income (loss) attributable to The Williams Companies, Inc.	195	152
Preferred stock dividends	1	0
Net income (loss) available to common stockholders	$ 194	$ 152
Basic earnings (loss) per common share:
Net income (loss)	$ 0.16	$ 0.18
Weighted-average shares (thousands)	1,211,489	827,509
Diluted earnings (loss) per common share:
Net income (loss)	$ 0.16	$ 0.18
Weighted-average shares (thousands)	1,213,592	830,197
Service [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,440	$ 1,351
Product [Member]
Revenues:
Revenue from Contract with Customer, Excluding Assessed Tax	550	636
Oil and Gas, Purchased [Member]
Costs and expenses:
Product costs	$ 525	$ 613