Other Income and Expenses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Williams Partners [Member]
Segment Reporting Information [Line Items]
Amortization of Regulatory Asset	$ 8	$ 8	$ 25	$ 15
Impairment of certain equipment held for sale	0	0	17	0
Net gain related to partial acreage dedication release	(12)	0	(12)	0
Accrued loss associated with a producer claim	0	9	0	9
Former Venezuela Operations [Member]
Segment Reporting Information [Line Items]
Investment Income, Interest	14	11	41	37
Asset Impairment for Regulatory Action - Eminence abandonment [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Write-off of the Eminence abandonment regulatory asset not recoverable through rates	0	9	0	15
Insurance recoveries	0	(3)	0	(15)
Bluegrass Pipeline Company Llc [Member] | Williams NGL & Petchem Services [Member]
Segment Reporting Information [Line Items]
Project Development Costs			19
Access Midstream Partners [Member] | Access Midstream Partners [Member]
Segment Reporting Information [Line Items]
Equity Method Investment, Realized Gain (Loss) on Disposal	1		5	26
Geismar Incident [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Insurable Expenses in Excess of our Deductibles			14
Insurance deductible expense		4		10
Insurance recoveries		(50)	(175)	(50)
Geismar Incident [Member] | Property Damage And Business Interruption [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Maximum insurance recoverable amount	500		500
Geismar Incident [Member] | Property Damage [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Insurance deductibles	10		10
Geismar Incident [Member] | Business Interruption [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Duration of waiting period before business interrutpion coverage begins			60 days
Geismar Incident [Member] | General Liability [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Maximum insurance recoverable amount	610		610
Insurance deductibles	2		2
Geismar Incident [Member] | Workers Compensation [Member] | Williams Partners [Member]
Segment Reporting Information [Line Items]
Insurance deductibles	$ 1		$ 1