Consolidated Statement of Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Total Stockholders’ Equity	Preferred Stock	Common Stock	Capital in Excess of Par Value	Retained Deficit	AOCI*	Treasury Stock	Noncontrolling Interests
Period Start at Dec. 31, 2018	$ 15,997	$ 14,660	$ 35	$ 1,245	$ 24,693	$ (10,002)	$ (270)	$ (1,041)	$ 1,337
Net income (loss)	780	726	0	0	0	726	0	0	54
Other comprehensive income (loss)	4	4	0	0	0	0	4	0	0
Cash dividends – common stock	(1,382)	(1,382)	0	0	0	(1,382)	0	0	0
Dividends and distributions to noncontrolling interests	(86)	0	0	0	0	0	0	0	(86)
Stock-based compensation and related common stock issuances, net of tax	45	45	0	2	43	0	0	0	0
Sales of limited partner units of Williams Partners L.P.	1,333	0	0	0	0	0	0	0	1,333
Changes in ownership of consolidated subsidiaries, net	142	(426)	0	0	(426)	0	0	0	568
Contributions from noncontrolling interests	32	0	0	0	0	0	0	0	32
Other	(6)	(6)	0	0	0	(6)	0	0	0
Net increase (decrease) in equity	862	(1,039)	0	2	(383)	(662)	4	0	1,901
Period End at Sep. 30, 2019	16,859	13,621	35	1,247	24,310	(10,664)	(266)	(1,041)	3,238
Period Start at Dec. 31, 2018	15,997	14,660	35	1,245	24,693	(10,002)	(270)	(1,041)	1,337
Period End at Dec. 31, 2019	16,364	13,363	35	1,247	24,323	(11,002)	(199)	(1,041)	3,001
Period Start at Jun. 30, 2019	17,081	13,848	35	1,246	24,296	(10,423)	(265)	(1,041)	3,233
Net income (loss)	242	221	0	0	0	221	0	0	21
Other comprehensive income (loss)	(1)	(1)	0	0	0	0	(1)	0	0
Cash dividends – common stock	(461)	(461)	0	0	0	(461)	0	0	0
Dividends and distributions to noncontrolling interests	(18)	0	0	0	0	0	0	0	(18)
Stock-based compensation and related common stock issuances, net of tax	17	17	0	1	16	0	0	0	0
Changes in ownership of consolidated subsidiaries, net	1	(1)	0	0	(1)	0	0	0	2
Deconsolidation of subsidiary (Note 5)			0
Other	(2)	(2)		0	(1)	(1)	0	0	0
Net increase (decrease) in equity	(222)	(227)	0	1	14	(241)	(1)	0	5
Period End at Sep. 30, 2019	16,859	13,621	35	1,247	24,310	(10,664)	(266)	(1,041)	3,238
Period Start at Dec. 31, 2019	16,364	13,363	35	1,247	24,323	(11,002)	(199)	(1,041)	3,001
Net income (loss)	68	95	0	0	0	95	0	0	(27)
Other comprehensive income (loss)	39	39	0	0	0	0	39	0	0
Cash dividends – common stock	(1,456)	(1,456)	0	0	0	(1,456)	0	0	0
Dividends and distributions to noncontrolling interests	(147)	0	0	0	0	0	0	0	(147)
Stock-based compensation and related common stock issuances, net of tax	37	37	0	1	36	0	0	0	0
Contributions from noncontrolling interests	5	0	0	0	0	0	0	0	5
Other	(12)	(13)	0	0	0	(13)	0	0	1
Net increase (decrease) in equity	(1,466)	(1,298)	0	1	36	(1,374)	39	0	(168)
Period End at Sep. 30, 2020	14,898	12,065	35	1,248	24,359	(12,376)	(160)	(1,041)	2,833
Period Start at Jun. 30, 2020	15,080	12,212	35	1,248	24,343	(12,197)	(176)	(1,041)	2,868
Net income (loss)	323	309	0	0	0	309	0	0	14
Other comprehensive income (loss)	16	16	0	0	0	0	16	0	0
Cash dividends – common stock	(485)	(485)	0	0	0	(485)	0	0	0
Dividends and distributions to noncontrolling interests	(49)	0	0	0	0	0	0	0	(49)
Stock-based compensation and related common stock issuances, net of tax	16	16	0	0	16	0	0	0	0
Contributions from noncontrolling interests	1	0	0	0	0	0	0	0	1
Other	(4)	(3)	0	0	0	(3)	0	0	(1)
Net increase (decrease) in equity	(182)	(147)	0	0	16	(179)	16	0	(35)
Period End at Sep. 30, 2020	$ 14,898	$ 12,065	$ 35	$ 1,248	$ 24,359	$ (12,376)	$ (160)	$ (1,041)	$ 2,833