Consolidated Statement of Operations (Unaudited) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Total revenues	$ 2,669	$ 2,289	$ 5,244	$ 4,880
Segment costs and expenses:
Costs and operating expenses	1,938	1,717	3,846	3,634
Selling, general, and administrative expenses	134	123	271	234
Other (income) expense - net	3	(12)	2	(13)
Total segment costs and expenses	2,075	1,828	4,119	3,855
General corporate expenses	47	45	98	130
Operating income (loss):
Total operating income (loss)	547	416	1,027	895
Interest accrued	(156)	(154)	(314)	(318)
Interest capitalized	9	13	18	30
Investing Income - net	45	55	96	94
Early debt retirement costs				(606)
Other income (expense) - net		(1)	4	(8)
Income (loss) from continuing operations before income taxes	445	329	831	87
Provision (benefit) for income taxes	145	104	139	10
Income (loss) from continuing operations	300	225	692	77
Income (loss) from discontinued operations	(3)	(3)	(11)	(1)
Net income (loss)	297	222	681	76
Less: Net income attributable to noncontrolling interests	70	37	133	84
Net income (loss) attributable to The Williams Companies, Inc.	227	185	548	(8)
Amounts attributable to The Williams Companies, Inc.:
Income (loss) from continuing operations	230	188	559	(7)
Income (loss) from discontinued operations	(3)	(3)	(11)	(1)
Net income (loss)	227	185	548	(8)
Basic earnings (loss) per common share:
Income (loss) from continuing operations	$ 0.39	$ 0.32	$ 0.95	$ (0.01)
Income (loss) from discontinued operations			$ (0.02)
Net income (loss)	$ 0.39	$ 0.32	$ 0.93	$ (0.01)
Weighted-average shares (thousands)	588,310	584,414	587,641	584,173
Diluted earnings (loss) per common share:
Income (loss) from continuing operations	$ 0.38	$ 0.31	$ 0.94	$ (0.01)
Income (loss) from discontinued operations			$ (0.02)
Net income (loss)	$ 0.38	$ 0.31	$ 0.92	$ (0.01)
Weighted-average shares (thousands)	597,633	592,498	597,097	584,173
Cash dividends declared per common share	$ 0.200	$ 0.125	$ 0.325	$ 0.235
Williams Partners
Revenues:
Total revenues	1,671	1,400	3,250	2,890
Operating income (loss):
Total operating income (loss)	435	334	847	732
Exploration & Production
Revenues:
Total revenues	981	901	1,970	2,058
Operating income (loss):
Total operating income (loss)	89	68	134	216
Midstream Canada & Olefins
Revenues:
Total revenues	347	257	663	529
Operating income (loss):
Total operating income (loss)	72	61	146	81
Other [Member]
Revenues:
Total revenues	7	5	13	11
Operating income (loss):
Total operating income (loss)	(2)	(2)	(2)	(4)
Intercompany Eliminations
Revenues:
Total revenues	(337)	(274)	(652)	(608)
General Corporate Expense
Operating income (loss):
Total operating income (loss)	$ (47)	$ (45)	$ (98)	$ (130)