Derivative Instruments and Concentration of Credit Risk (Tables)

12 Months Ended

Dec. 31, 2012

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Notional quantities of the net long (short) positions in commodity derivatives portfolio

		Unit of	Central Hub
Derivative Notional Volumes		Measure	Risk	Basis Risk
Not Designated as Hedging Instruments
	Williams Partners	Barrels	(185,000)	(38,256,000)

Pre-tax gains and losses for energy commodity derivatives designated as cash flow hedges, as recognized in accumulated other comprehensive income (loss) (AOCI), product sales or product costs

	Discontinued Operations
			Year ended
			December 31, 2011		Classification
			(Millions)
Designated as cash flow hedges
	Net gain (loss) recognized in other comprehensive
		income (loss) (effective portion)	$	413	AOCI
	Net gain (loss) reclassified from accumulated other				Income (loss) from
		comprehensive income (loss) into income			discontinued
		(effective portion)	$	332	operations
Not designated as cash flow hedges
					Income (loss) from
					discontinued
	Gain (loss) recognized in income		$	30	operations

		Years ended December 31,
		2012		2011		Classification
			(Millions)
Net gain (loss) recognized in other comprehensive
	income (loss) (effective portion)	$	30	$	(18)	AOCI
Net gain (loss) reclassified from accumulated other
	comprehensive income (loss) into income					Product Sales or
	(effective portion)	$	30	$	(18)	Product Costs

Concentration of receivables, net of allowances, by product or service

				December 31,
			2012		2011
				(Millions)
Receivables by product or service:
	Sale of NGLs and related products and services		$	411	$	446
	Transportation of natural gas and related products			170		164
	Other			107		27
		Total	$	688	$	637