Consolidated Statement of Operations (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Revenues:
Service revenues	$ 2,729		$ 2,532		$ 2,359
Product sales	4,757		5,398		4,279
Total revenues	7,486		7,930		6,638
Costs and expenses:
Product costs	3,496		3,934		3,260
Operating and maintenance expenses	1,027		990		870
Depreciation and amortization expenses	756		661		612
Selling, general, and administrative expenses	571		477		504
Other (income) expense - net	24		1		(15)
Total costs and expenses	5,874		6,063		5,231
Operating income (loss)	1,612		1,867		1,407
Equity earnings (losses)	111	[1]	155	[1]	143	[1]
Interest incurred	(568)		(598)		(628)
Interest capitalized	59		25		36
Other investing income - net	77		13		45
Early debt retirement costs	0		(271)		(606)
Other income (expense) - net	(2)		11		(12)
Income (loss) from continuing operations before income taxes	1,289		1,202		385
Provision (benefit) for income taxes	360		124		114
Income (loss) from continuing operations	929		1,078		271
Income (loss) from discontinued operations	136		(417)		(1,193)
Net income (loss)	1,065		661		(922)
Less: Net income attributable to noncontrolling interests	206		285		175
Net income (loss) attributable to The Williams Companies, Inc.	859		376		(1,097)
Amounts attributable to The Williams Companies, Inc.:
Income (loss) from continuing operations	723		803		104
Income (loss) from discontinued operations	136		(427)		(1,201)
Net income (loss)	$ 859		$ 376		$ (1,097)
Basic earnings (loss) per common share:
Income (loss) from continuing operations	$ 1.17		$ 1.36		$ 0.17
Income (loss) from discontinued operations	$ 0.22		$ (0.72)		$ (2.05)
Net income (loss)	$ 1.39		$ 0.64		$ (1.88)
Weighted-average shares (thousands)	619,792		588,553		584,552
Diluted earnings (loss) per common share:
Income (loss) from continuing operations	$ 1.15		$ 1.34		$ 0.17
Income (loss) from discontinued operations	$ 0.22		$ (0.71)		$ (2.03)
Net income (loss)	$ 1.37		$ 0.63		$ (1.86)
Weighted-average shares (thousands)	625,486		598,175		590,699

[1] Items also included in segment profit (loss). (See Note 18.)