$WMB
WILLIAMS COMPANIES, INC. Stock $wmb

$wmb Overview Financials Valuation SEC Filings Company Website

2010 Q4 Form 10-K Financial Statement

#000119312512082513 Filed on February 28, 2012

Income Statement

Concept	2010 Q4	2009 Q4	2009
Revenue	$1.741B	$2.326B	$5.278B
YoY Change	-25.15%	11.61%	-55.61%
Cost Of Revenue	$1.209B	$1.708B	$3.712B
YoY Change	-29.22%	5.56%	-57.7%
Gross Profit	$532.0M	$618.0M	$1.566B
YoY Change	-13.92%	32.62%	-49.71%
Gross Profit Margin	30.56%	26.57%	29.67%
Selling, General & Admin	$138.0M	$178.0M	$330.0M
YoY Change	-22.47%	11.25%	-49.46%
% of Gross Profit	25.94%	28.8%	21.07%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$406.0M	$382.0M	$1.469B
YoY Change	6.28%	7.0%	12.14%
% of Gross Profit	76.32%	61.81%	93.81%
Operating Expenses	$149.0M	$147.0M	$330.0M
YoY Change	1.36%	-36.91%	-22.9%
Operating Profit	$383.0M	$471.0M	$1.106B
YoY Change	-18.68%	102.15%	-58.82%
Interest Expense	-$111.0M	-$101.0M	-$546.0M
YoY Change	9.9%	-15.13%	40.72%
% of Operating Profit	-28.98%	-21.44%	-49.37%
Other Income/Expense, Net	$1.000M	$4.000M	$2.000M
YoY Change	-75.0%	-166.67%
Pretax Income	$273.0M	$358.0M	$550.0M
YoY Change	-23.74%	234.58%	-74.35%
Income Tax	$113.0M	$136.0M	$204.0M
% Of Pretax Income	41.39%	37.99%	37.09%
Net Earnings	$174.0M	$172.0M	$285.0M
YoY Change	1.16%	49.57%	-79.9%
Net Earnings / Revenue	9.99%	7.39%	5.4%
Basic Earnings Per Share			$0.49
Diluted Earnings Per Share	$292.8K	$290.8K	$0.49
COMMON SHARES
Basic Shares Outstanding	584.8M shares		581.7M shares
Diluted Shares Outstanding			586.0M shares

Balance Sheet

Concept	2010 Q4	2009 Q4	2009
SHORT-TERM ASSETS
Cash & Short-Term Investments	$758.0M	$1.867B	$1.867B
YoY Change	-59.4%	29.83%	29.83%
Cash & Equivalents	$795.0M	$1.867B	$1.867B
Short-Term Investments
Other Short-Term Assets	$102.0M	$225.0M	$888.0M
YoY Change	-54.67%	-87.7%	-51.45%
Inventory	$225.0M	$222.0M	$222.0M
Prepaid Expenses
Receivables	$497.0M	$816.0M	$816.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$2.530B	$3.793B	$3.793B
YoY Change	-33.3%	-14.01%	-14.01%
LONG-TERM ASSETS
Property, Plant & Equipment	$11.75B	$18.64B	$18.64B
YoY Change	-36.96%	5.09%	5.09%
Goodwill		$1.011B
YoY Change
Intangibles
YoY Change
Long-Term Investments	$1.342B	$886.0M	$886.0M
YoY Change	51.47%	-8.75%	-8.75%
Other Assets	$620.0M	$502.0M	$946.0M
YoY Change	23.51%	-73.18%	-49.47%
Total Long-Term Assets	$22.44B	$21.49B	$21.49B
YoY Change	4.44%	-0.5%	-0.5%
TOTAL ASSETS
Total Short-Term Assets	$2.530B	$3.793B	$3.793B
Total Long-Term Assets	$22.44B	$21.49B	$21.49B
Total Assets	$24.97B	$25.28B	$25.28B
YoY Change	-1.22%	-2.79%	-2.79%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$432.0M	$934.0M	$934.0M
YoY Change	-53.75%	-11.22%	-11.22%
Accrued Expenses	$738.0M	$948.0M	$836.0M
YoY Change	-22.15%	-16.77%	-15.98%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$508.0M	$17.00M	$17.00M
YoY Change	2888.24%	-5.56%	-5.56%
Total Short-Term Liabilities	$2.574B	$2.477B	$2.477B
YoY Change	3.92%	-29.61%	-29.61%
LONG-TERM LIABILITIES
Long-Term Debt	$8.600B	$8.259B	$8.259B
YoY Change	4.13%	7.5%	7.5%
Other Long-Term Liabilities	$3.441B	$1.869B	$1.869B
YoY Change	84.11%	-23.24%	-23.24%
Total Long-Term Liabilities	$12.04B	$10.13B	$10.13B
YoY Change	18.89%	0.1%	0.1%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.574B	$2.477B	$2.477B
Total Long-Term Liabilities	$12.04B	$10.13B	$10.13B
Total Liabilities	$18.17B	$16.83B	$16.83B
YoY Change	7.94%	-4.17%	-4.17%
SHAREHOLDERS EQUITY
Retained Earnings	-$478.0M	$903.0M
YoY Change	-152.93%
Common Stock	$8.889B	$8.753B
YoY Change	1.55%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$1.041B	$1.041B
YoY Change	0.0%
Treasury Stock Shares	35.00M shares	35.00M shares
Shareholders Equity	$7.288B	$8.447B	$8.447B
YoY Change
Total Liabilities & Shareholders Equity	$24.97B	$25.28B	$25.28B
YoY Change	-1.22%	-2.79%	-2.79%

Cashflow Statement

Concept	2010 Q4	2009 Q4	2009
OPERATING ACTIVITIES
Net Income	$174.0M	$172.0M	$285.0M
YoY Change	1.16%	49.57%	-79.9%
Depreciation, Depletion And Amortization	$406.0M	$382.0M	$1.469B
YoY Change	6.28%	7.0%	12.14%
Cash From Operating Activities	$710.0M	$814.0M	$2.572B
YoY Change	-12.78%	8.68%	-23.34%
INVESTING ACTIVITIES
Capital Expenditures	-$716.0M	-$558.0M	-$2.387B
YoY Change	28.32%	-30.51%	-29.67%
Acquisitions			$0.00
YoY Change
Other Investing Activities	-$1.108B	$66.00M	-$71.00M
YoY Change	-1778.79%	-22.35%	-133.65%
Cash From Investing Activities	-$1.824B	-$492.0M	-$2.310B
YoY Change	270.73%	-31.48%	-27.43%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net			$33.00M
YoY Change
Cash From Financing Activities	894.0M	-95.00M	$166.0M
YoY Change	-1041.05%	-18.1%	-138.43%
NET CHANGE
Cash From Operating Activities	710.0M	814.0M	$2.572B
Cash From Investing Activities	-1.824B	-492.0M	-$2.310B
Cash From Financing Activities	894.0M	-95.00M	$166.0M
Net Change In Cash	-220.0M	227.0M	$428.0M
YoY Change	-196.92%	-367.06%	-264.62%
FREE CASH FLOW
Cash From Operating Activities	$710.0M	$814.0M	$2.572B
Capital Expenditures	-$716.0M	-$558.0M	-$2.387B
Free Cash Flow	$1.426B	$1.372B	$4.959B
YoY Change	3.94%	-11.6%	-26.52%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2009	us-gaap	Other General Expense OtherGeneralExpense	164000000	USD
CY2011	dei	Document Type DocumentType	10-K
CY2011	dei	Document Period End Date DocumentPeriodEndDate	2011-12-31
CY2011	dei	Amendment Flag AmendmentFlag	false
CY2011	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2011	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2011	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2011
CY2011	dei	Entity Central Index Key EntityCentralIndexKey	0000107263
CY2011	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2011	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2011	dei	Entity Registrant Name EntityRegistrantName	Williams Companies Inc
CY2011	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2011	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2012Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	592181611	shares
CY2011Q2	dei	Entity Public Float EntityPublicFloat	17802985945	USD
CY2011	us-gaap	Revenues Revenues	7930000000	USD
CY2010	us-gaap	Revenues Revenues	6638000000	USD
CY2009	us-gaap	Revenues Revenues	5278000000	USD
CY2010	wmb	Costs And Operating Expenses CostsAndOperatingExpenses	4712000000	USD
CY2011	wmb	Costs And Operating Expenses CostsAndOperatingExpenses	5550000000	USD
CY2009	wmb	Costs And Operating Expenses CostsAndOperatingExpenses	3712000000	USD
CY2011	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	325000000	USD
CY2010	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	313000000	USD
CY2009	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	330000000	USD
CY2011	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-1000000	USD
CY2010	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	15000000	USD
CY2009	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	34000000	USD
CY2011	wmb	Total Segment Costs Expenses TotalSegmentCostsExpenses	5876000000	USD
CY2010	wmb	Total Segment Costs Expenses TotalSegmentCostsExpenses	5010000000	USD
CY2009	wmb	Total Segment Costs Expenses TotalSegmentCostsExpenses	4008000000	USD
CY2011	us-gaap	Other General Expense OtherGeneralExpense	187000000	USD
CY2010	us-gaap	Other General Expense OtherGeneralExpense	221000000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-2.05
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	1867000000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	1407000000	USD
CY2009	us-gaap	Operating Income Loss OperatingIncomeLoss	1106000000	USD
CY2011	us-gaap	Interest Costs Incurred InterestCostsIncurred	598000000	USD
CY2010	us-gaap	Interest Costs Incurred InterestCostsIncurred	628000000	USD
CY2009	us-gaap	Interest Costs Incurred InterestCostsIncurred	656000000	USD
CY2011	wmb	Interest Capitalized InterestCapitalized	25000000	USD
CY2010	wmb	Interest Capitalized InterestCapitalized	36000000	USD
CY2009	wmb	Interest Capitalized InterestCapitalized	61000000	USD
CY2011	wmb	Investing Income Loss InvestingIncomeLoss	168000000	USD
CY2009	wmb	Investing Income Loss InvestingIncomeLoss	38000000	USD
CY2010	wmb	Investing Income Loss InvestingIncomeLoss	188000000	USD
CY2010	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-606000000	USD
CY2011	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-271000000	USD
CY2009	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-1000000	USD
CY2009	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2000000	USD
CY2010	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-12000000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	11000000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1202000000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	385000000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	550000000	USD
CY2009	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	204000000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	114000000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	124000000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	1078000000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	271000000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	346000000	USD
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	15000000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	-1193000000	USD
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CY2011	us-gaap	Profit Loss ProfitLoss	661000000	USD
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CY2010	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	175000000	USD
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CY2011	us-gaap	Net Income Loss NetIncomeLoss	376000000	USD
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CY2009	us-gaap	Net Income Loss NetIncomeLoss	285000000	USD
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CY2011	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.36
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CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-.72
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CY2011Q4	us-gaap	Inventory Net InventoryNet	169000000	USD
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CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	.14
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CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	584552000	shares
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CY2009	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	.35
CY2010	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	.17
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CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-.71
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CY2010Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	51000000	USD
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CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2010Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2008Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9054000000	USD
CY2009	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	83000000	USD
CY2009	wmb	Other Comprehensive Income Pension Benefit Changes In Net Actuarial Gain Loss Net Of Tax OtherComprehensiveIncomePensionBenefitChangesInNetActuarialGainLossNetOfTax	53000000	USD
CY2009	wmb	Other Comprehensive Income Amortization Of Other Postretirement Benefits Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeAmortizationOfOtherPostretirementBenefitsNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	4000000	USD
CY2009	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	280000000	USD
CY2009	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	256000000	USD
CY2009	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	129000000	USD
CY2009	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	38000000	USD
CY2009	us-gaap	Stockholders Equity Other StockholdersEquityOther	4000000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9019000000	USD
CY2010	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	29000000	USD
CY2010	wmb	Other Comprehensive Income Amortization Of Pension Benefits Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeAmortizationOfPensionBenefitsNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	1000000	USD
CY2010	wmb	Other Comprehensive Income Pension Benefit Changes In Net Actuarial Gain Loss Net Of Tax OtherComprehensiveIncomePensionBenefitChangesInNetActuarialGainLossNetOfTax	-25000000	USD
CY2010	wmb	Other Comprehensive Income Amortization Of Other Postretirement Benefits Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeAmortizationOfOtherPostretirementBenefitsNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	-3000000	USD
CY2010	wmb	Other Comprehensive Income Other Postretirement Benefit Changes In Net Actuarial Gain Loss Net Of Tax OtherComprehensiveIncomeOtherPostretirementBenefitChangesInNetActuarialGainLossNetOfTax	-8000000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-836000000	USD
CY2010	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	284000000	USD
CY2010	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	145000000	USD
CY2010	us-gaap	Partners Capital Account Public Sale Of Units Net Of Offering Costs PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts	806000000	USD
CY2010	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	57000000	USD
CY2010	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Net ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet	0	USD
CY2011	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease	-18000000	USD
CY2011	wmb	Other Comprehensive Income Amortization Of Pension Benefits Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeAmortizationOfPensionBenefitsNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	1000000	USD
CY2011	wmb	Other Comprehensive Income Pension Benefit Changes In Net Actuarial Gain Loss Net Of Tax OtherComprehensiveIncomePensionBenefitChangesInNetActuarialGainLossNetOfTax	-112000000	USD
CY2011	wmb	Other Comprehensive Income Amortization Of Other Postretirement Benefits Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeAmortizationOfOtherPostretirementBenefitsNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	-2000000	USD
CY2011	wmb	Other Comprehensive Income Other Postretirement Benefit Changes In Net Actuarial Gain Loss Net Of Tax OtherComprehensiveIncomeOtherPostretirementBenefitChangesInNetActuarialGainLossNetOfTax	-13000000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	3000000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	573000000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	457000000	USD
CY2011	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	214000000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	108000000	USD
CY2011	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Net ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet	0	USD
CY2011	us-gaap	Stockholders Equity Note Spinoff Transaction StockholdersEquityNoteSpinoffTransaction	-5561000000	USD
CY2011	us-gaap	Stockholders Equity Other StockholdersEquityOther	1000000	USD
CY2010	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	92000000	USD
CY2009	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	-221000000	USD
CY2011	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Period Increase Decrease OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPeriodIncreaseDecrease	53000000	USD
CY2009	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-81000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	86000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-88000000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1614000000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1507000000	USD
CY2009	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1469000000	USD
CY2011	wmb	Deferred Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-179000000	USD
CY2010	wmb	Deferred Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	-155000000	USD
CY2009	wmb	Deferred Income Tax Expense Benefit From Continuing And Discontinued Operations DeferredIncomeTaxExpenseBenefitFromContinuingAndDiscontinuedOperations	249000000	USD
CY2011	us-gaap	Asset Impairment Charges AssetImpairmentCharges	882000000	USD
CY2010	us-gaap	Asset Impairment Charges AssetImpairmentCharges	1735000000	USD
CY2009	us-gaap	Asset Impairment Charges AssetImpairmentCharges	386000000	USD
CY2011	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1000000	USD
CY2010	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	-6000000	USD
CY2009	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	48000000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	52000000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	48000000	USD
CY2009	us-gaap	Share Based Compensation ShareBasedCompensation	43000000	USD
CY2011	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	197000000	USD
CY2010	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	36000000	USD
CY2010	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	2788000000	USD
CY2011	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	233000000	USD
CY2009	us-gaap	Increase Decrease In Accounts And Notes Receivable IncreaseDecreaseInAccountsAndNotesReceivable	-52000000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-60000000	USD
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	81000000	USD
CY2009	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-33000000	USD
CY2011	wmb	Increase Decrease In Margin Deposits And Customer Margin Deposits Payable IncreaseDecreaseInMarginDepositsAndCustomerMarginDepositsPayable	18000000	USD
CY2010	wmb	Increase Decrease In Margin Deposits And Customer Margin Deposits Payable IncreaseDecreaseInMarginDepositsAndCustomerMarginDepositsPayable	1000000	USD
CY2009	wmb	Increase Decrease In Margin Deposits And Customer Margin Deposits Payable IncreaseDecreaseInMarginDepositsAndCustomerMarginDepositsPayable	-4000000	USD
CY2011	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	15000000	USD
CY2010	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-43000000	USD
CY2009	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-7000000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	250000000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-14000000	USD
CY2009	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	5000000	USD
CY2011	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	51000000	USD
CY2010	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-29000000	USD
CY2009	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-170000000	USD
CY2011	us-gaap	Increase Decrease In Commodity Contract Assets And Liabilities IncreaseDecreaseInCommodityContractAssetsAndLiabilities	-7000000	USD
CY2010	us-gaap	Increase Decrease In Commodity Contract Assets And Liabilities IncreaseDecreaseInCommodityContractAssetsAndLiabilities	42000000	USD
CY2009	us-gaap	Increase Decrease In Commodity Contract Assets And Liabilities IncreaseDecreaseInCommodityContractAssetsAndLiabilities	-36000000	USD
CY2011	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	1000000	USD
CY2010	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	2000000	USD
CY2009	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	-48000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3439000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2651000000	USD
CY2009	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2572000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	3172000000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	5129000000	USD
CY2009	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	595000000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	2055000000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	4305000000	USD
CY2009	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	33000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Limited Partners Units ProceedsFromIssuanceOfCommonLimitedPartnersUnits	0	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Limited Partners Units ProceedsFromIssuanceOfCommonLimitedPartnersUnits	806000000	USD
CY2009	us-gaap	Proceeds From Issuance Of Common Limited Partners Units ProceedsFromIssuanceOfCommonLimitedPartnersUnits	0	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	457000000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	284000000	USD
CY2009	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	256000000	USD
CY2011	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	214000000	USD
CY2010	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	145000000	USD
CY2009	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	129000000	USD
CY2010	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	71000000	USD
CY2009	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	7000000	USD
CY2011	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	254000000	USD
CY2010	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	574000000	USD
CY2009	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
CY2011	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	0	USD
CY2010	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	0	USD
CY2009	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	40000000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	42000000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	17000000	USD
CY2009	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-44000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-342000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	573000000	USD
CY2009	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	166000000	USD
CY2011	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	2796000000	USD
CY2011	us-gaap	Discontinued Operation Provision For Loss Gain On Disposal Before Income Tax DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax	755000000	USD
CY2010	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	488000000	USD
CY2009	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	142000000	USD
CY2011	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	41000000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-1072000000	USD
CY2009	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	428000000	USD
CY2011	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	2953000000	USD
CY2010	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	2755000000	USD
CY2009	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	2314000000	USD
CY2011	wmb	Changes In Accounts Payable And Accrued Liabilities ChangesInAccountsPayableAndAccruedLiabilities	157000000	USD
CY2010	wmb	Changes In Accounts Payable And Accrued Liabilities ChangesInAccountsPayableAndAccruedLiabilities	-33000000	USD
CY2009	wmb	Changes In Accounts Payable And Accrued Liabilities ChangesInAccountsPayableAndAccruedLiabilities	-73000000	USD
CY2011	us-gaap	Use Of Estimates UseOfEstimates	<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:7.9px;">Use of estimates</font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:14.4px;">The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates.</font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:14.4px;">Significant estimates and assumptions include: </font></p><p style='margin-top:0pt; margin-bottom:0pt'> </p><p style='margin-top:0pt; margin-bottom:0pt'></p><ul><li><font style="font-family:Times New Roman;font-size:10pt;">Impairment assessments of investments</font><font style="font-family:Times New Roman;font-size:10pt;"> and </font><font style="font-family:Times New Roman;font-size:10pt;">long-lived assets;</font><font style="font-family:Times New Roman;font-size:10pt;"> </font><p> </p></li><li><font style="font-family:Times New Roman;font-size:10pt;">Litigation-related contingencies; </font><p> </p></li><li><font style="font-family:Times New Roman;font-size:10pt;">Environmental remediation obligations; </font><p> </p></li><li><font style="font-family:Times New Roman;font-size:10pt;">Realization of deferred income tax assets; </font><p> </p></li><li><font style="font-family:Times New Roman;font-size:10pt;">Asset</font><font style="font-family:Times New Roman;font-size:10pt;"> retirement obligations; </font><p> </p></li><li><font style="font-family:Times New Roman;font-size:10pt;">Pension and post</font><font style="font-family:Times New Roman;font-size:10pt;">retirement valuation variables</font><font style="font-family:Times New Roman;font-size:10pt;">.</font><p> </p></li></ul><p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:0px;">These estimates are discussed further throughout these notes. </font></p><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><p style='margin-top:12pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;font-style:italic;margin-left:7.9px;">Discontinued Operations</font></p><p style='margin-top: 0pt; margin-bottom: 0pt;'></p><p style='margin-top:12pt; margin-bottom:0pt'></p><ul><li><font style="font-family:Times New Roman;font-size:10pt;">Significant estimates and assumptions include</font><font style="font-family:Times New Roman;font-size:10pt;">d</font><font style="font-family:Times New Roman;font-size:10pt;"> the valuation of oil and natural gas reserves, valuation of derivatives and hedge accounting correlations and probability;</font></li></ul><p style='margin-top:0pt; margin-bottom:0pt'> </p>
CY2010	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1099000000	USD
CY2009	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2011	wmb	Equity Method Investment Distribution Debt Offering EquityMethodInvestmentDistributionDebtOffering	0	USD
CY2010	wmb	Equity Method Investment Distribution Debt Offering EquityMethodInvestmentDistributionDebtOffering	0	USD
CY2009	wmb	Equity Method Investment Distribution Debt Offering EquityMethodInvestmentDistributionDebtOffering	148000000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-67000000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-79000000	USD
CY2009	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-71000000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3003000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-4296000000	USD
CY2009	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2310000000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	94000000	USD
CY2009	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	2387000000	USD
CY2010Q4	wmb	Cash And Cash Equivalents At Carrying Value Including Former Business CashAndCashEquivalentsAtCarryingValueIncludingFormerBusiness	795000000	USD
CY2009Q4	wmb	Cash And Cash Equivalents At Carrying Value Including Former Business CashAndCashEquivalentsAtCarryingValueIncludingFormerBusiness	1867000000	USD
CY2008Q4	wmb	Cash And Cash Equivalents At Carrying Value Including Former Business CashAndCashEquivalentsAtCarryingValueIncludingFormerBusiness	1439000000	USD
CY2011	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	50000000	USD
CY2010	wmb	Payments Of Cash At Spin Off PaymentsOfCashAtSpinOff	0	USD
CY2009	wmb	Payments Of Cash At Spin Off PaymentsOfCashAtSpinOff	0	USD
CY2011	wmb	Payments Of Cash At Spin Off PaymentsOfCashAtSpinOff	526000000	USD
CY2011Q4	wmb	Cash And Cash Equivalents At Carrying Value Excluding Former Business CashAndCashEquivalentsAtCarryingValueExcludingFormerBusiness	889000000	USD
CY2011Q2	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	297000000	USD
CY2011Q2	wmb	Number Of Limited Partner Units Received NumberOfLimitedPartnerUnitsReceived	632584	shares
CY2011Q2	us-gaap	Limited Liability Company Llc Or Limited Partnership Lp Managing Member Or General Partner Ownership Interest LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest	0.02	pure
CY2011	us-gaap	Limited Liability Company Llc Or Limited Partnership Lp Members Or Limited Partners Ownership Interest LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest	0.75	pure
CY2011Q4	wmb	Former Business Ownership Interest FormerBusinessOwnershipInterest	1	pure
CY2011Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	0	USD
CY2011	wmb	Minimum Period Of Construction For Capitalization Of Interest MinimumPeriodOfConstructionForCapitalizationOfInterest	P3M
CY2009	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	-64000000	USD
CY2009	wmb	Interest Income And Other InterestIncomeAndOther	6000000	USD
CY2010	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2010Q4	us-gaap	Disposal Group Including Discontinued Operation Cash And Cash Equivalents DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents	37000000	USD
CY2010Q4	us-gaap	Disposal Group Including Discontinued Operation Accounts Notes And Loans Receivable Net DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet	362000000	USD
CY2010Q4	us-gaap	Disposal Group Including Discontinued Operation Inventory DisposalGroupIncludingDiscontinuedOperationInventory	78000000	USD
CY2010Q4	wmb	Disposal Group Including Discontinued Operation Derivative Assets Current DisposalGroupIncludingDiscontinuedOperationDerivativeAssetsCurrent	400000000	USD
CY2010Q4	us-gaap	Disposal Group Including Discontinued Operation Other Current Assets DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	20000000	USD
CY2010Q4	wmb	Disposal Group Including Discontinued Operation Investments DisposalGroupIncludingDiscontinuedOperationInvestments	104000000	USD
CY2010Q4	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment Net DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet	8518000000	USD
CY2010Q4	wmb	Disposal Group Including Discontinued Operation Derivative Asset Noncurrent DisposalGroupIncludingDiscontinuedOperationDerivativeAssetNoncurrent	173000000	USD
CY2010Q4	us-gaap	Disposal Group Including Discontinued Operation Goodwill DisposalGroupIncludingDiscontinuedOperationGoodwill	8000000	USD
CY2011	wmb	Voting Interest In Unconsolidated Companies Minimum VotingInterestInUnconsolidatedCompaniesMinimum	0.2	pure
CY2011	wmb	Voting Interest In Unconsolidated Companies Maximum VotingInterestInUnconsolidatedCompaniesMaximum	0.5	pure
CY2010Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	9000000	USD
CY2011	wmb	Minimum Total Project Cost For Capitalization Of Interest MinimumTotalProjectCostForCapitalizationOfInterest	1000000	USD
CY2010Q3	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	1000000000	USD
CY2011	wmb	Assets Disposed Spinoff Transaction AssetsDisposedSpinoffTransaction	10300000000	USD
CY2011	wmb	Liabilities Disposed Spinoff Transaction LiabilitiesDisposedSpinoffTransaction	4800000000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	3997000000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	4042000000	USD
CY2009	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	3684000000	USD
CY2011	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax	223000000	USD
CY2010	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax	350000000	USD
CY2009	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax	338000000	USD
CY2010	us-gaap	Discontinued Operation Provision For Loss Gain On Disposal Before Income Tax DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax	1682000000	USD
CY2009	us-gaap	Discontinued Operation Provision For Loss Gain On Disposal Before Income Tax DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax	242000000	USD
CY2009	us-gaap	Deconsolidation Gain Or Loss Amount DeconsolidationGainOrLossAmount	9000000	USD
CY2011	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-115000000	USD
CY2010	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-139000000	USD
CY2009	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	90000000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	10000000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Noncontrolling Interest IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToNoncontrollingInterest	8000000	USD
CY2010Q4	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Assets DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets	25000000	USD
CY2010Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	9725000000	USD
CY2010Q4	us-gaap	Disposal Group Including Discontinued Operation Accounts Payable DisposalGroupIncludingDiscontinuedOperationAccountsPayable	486000000	USD
CY2010Q4	us-gaap	Disposal Group Including Discontinued Operation Accrued Liabilities DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities	263000000	USD
CY2010Q4	wmb	Disposal Group Including Discontinued Operation Derivative Liabilities Current DisposalGroupIncludingDiscontinuedOperationDerivativeLiabilitiesCurrent	147000000	USD
CY2010Q4	us-gaap	Disposal Group Including Discontinued Operation Deferred Tax Liabilities DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilities	1711000000	USD
CY2010Q4	wmb	Disposal Group Including Discontinued Operation Derivative Liabilities Noncurrent DisposalGroupIncludingDiscontinuedOperationDerivativeLiabilitiesNoncurrent	142000000	USD
CY2010Q4	us-gaap	Disposal Group Including Discontinued Operation Other Noncurrent Liabilities DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities	326000000	USD
CY2010Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	3075000000	USD
CY2011Q4	wmb	Assumed Control Premium Percentage AssumedControlPremiumPercentage	0.3	pure
CY2009	us-gaap	Impairment Of Investments ImpairmentOfInvestments	11000000	USD
CY2010	wmb	Interest Income And Other InterestIncomeAndOther	2000000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	155000000	USD
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CY2011	wmb	Interest Income And Other InterestIncomeAndOther	7000000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	143000000	USD
CY2009	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	118000000	USD
CY2010	wmb	Income Loss From Investments IncomeLossFromInvestments	43000000	USD
CY2009	wmb	Income Loss From Investments IncomeLossFromInvestments	-75000000	USD
CY2009Q4	wmb	Percentage Of After Tax Discount Rate Included In Weighted Discounted Cash Flow Analysis PercentageOfAfterTaxDiscountRateIncludedInWeightedDiscountedCashFlowAnalysis	0.2	pure
CY2010Q4	us-gaap	Cost Method Investments CostMethodInvestments	2000000	USD
CY2011Q4	us-gaap	Equity Method Investments EquityMethodInvestments	1390000000	USD
CY2010Q4	us-gaap	Equity Method Investments EquityMethodInvestments	1238000000	USD
CY2011Q4	us-gaap	Cost Method Investments CostMethodInvestments	1000000	USD
CY2011Q4	us-gaap	Available For Sale Securities Equity Securities Current AvailableForSaleSecuritiesEquitySecuritiesCurrent	24000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Equity Securities Current AvailableForSaleSecuritiesEquitySecuritiesCurrent	0	USD
CY2011Q4	us-gaap	Investments Investments	1415000000	USD
CY2010Q4	us-gaap	Investments Investments	1240000000	USD
CY2011	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	193000000	USD
CY2010	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	175000000	USD
CY2009	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	282000000	USD
CY2011Q4	us-gaap	Equity Method Investment Difference Between Carrying Amount And Underlying Equity EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity	62000000	USD
CY2011	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	23000000	USD
CY2010	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	41000000	USD
CY2009	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	27000000	USD
CY2011	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	234000000	USD
CY2010	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	220000000	USD
CY2009	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	158000000	USD
CY2011Q4	wmb	Related Party Transaction Receivable RelatedPartyTransactionReceivable	1000000	USD
CY2010Q4	wmb	Related Party Transaction Receivable RelatedPartyTransactionReceivable	2000000	USD
CY2011Q4	wmb	Related Party Transaction Payable RelatedPartyTransactionPayable	23000000	USD
CY2010Q4	wmb	Related Party Transaction Payable RelatedPartyTransactionPayable	20000000	USD
CY2011	wmb	Related Party Transaction Operating Fees RelatedPartyTransactionOperatingFees	57000000	USD
CY2010	wmb	Related Party Transaction Operating Fees RelatedPartyTransactionOperatingFees	38000000	USD
CY2009	wmb	Related Party Transaction Operating Fees RelatedPartyTransactionOperatingFees	23000000	USD
CY2010Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	236000000	USD
CY2010Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	3976000000	USD
CY2010Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	157000000	USD
CY2010Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	1294000000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	1086000000	USD
CY2010	wmb	Equity Method Investment Summarized Financial Information Operating Income EquityMethodInvestmentSummarizedFinancialInformationOperatingIncome	587000000	USD
CY2010	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	429000000	USD
CY2009	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	872000000	USD
CY2009	wmb	Equity Method Investment Summarized Financial Information Operating Income EquityMethodInvestmentSummarizedFinancialInformationOperatingIncome	409000000	USD
CY2009	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	317000000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	293000000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	4409000000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	235000000	USD
CY2011Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	1257000000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	1242000000	USD
CY2011	wmb	Equity Method Investment Summarized Financial Information Operating Income EquityMethodInvestmentSummarizedFinancialInformationOperatingIncome	623000000	USD
CY2011	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	460000000	USD
CY2010	us-gaap	Restructuring Charges RestructuringCharges	45000000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	181000000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	13000000	USD
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CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	188000000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-61000000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-14000000	USD
CY2011	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	11000000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-64000000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-21000000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	108000000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	144000000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	6000000	USD
CY2011Q4	wmb	Exercise Price Ranges Of Options Excluded Minimum ExercisePriceRangesOfOptionsExcludedMinimum	26.10
CY2010	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	29000000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-48000000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-2000000	USD
CY2010	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	12000000	USD
CY2009	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	30000000	USD
CY2009	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-83000000	USD
CY2009	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	234000000	USD
CY2009	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	12000000	USD
CY2009	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-63000000	USD
CY2009	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	3000000	USD
CY2009	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	267000000	USD
CY2009	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	8000000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	421000000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	135000000	USD
CY2009	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	192000000	USD
CY2011	wmb	Deferred Taxes On Undistributed Earnings Of Certain Foreign Operations That Are No Longer Considered Permanently Invested DeferredTaxesOnUndistributedEarningsOfCertainForeignOperationsThatAreNoLongerConsideredPermanentlyInvested	-66000000	USD
CY2010	wmb	Deferred Taxes On Undistributed Earnings Of Certain Foreign Operations That Are No Longer Considered Permanently Invested DeferredTaxesOnUndistributedEarningsOfCertainForeignOperationsThatAreNoLongerConsideredPermanentlyInvested	66000000	USD
CY2009	wmb	Deferred Taxes On Undistributed Earnings Of Certain Foreign Operations That Are No Longer Considered Permanently Invested DeferredTaxesOnUndistributedEarningsOfCertainForeignOperationsThatAreNoLongerConsideredPermanentlyInvested	0	USD
CY2011	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	0	USD
CY2010	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	11000000	USD
CY2009	us-gaap	Income Tax Reconciliation Deductions Medicare Prescription Drug Benefit Subsidy IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy	0	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	15000000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	17000000	USD
CY2009	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	18000000	USD
CY2011	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	-96000000	USD
CY2010	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	-58000000	USD
CY2009	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	-49000000	USD
CY2009	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	24000000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-35000000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	11000000	USD
CY2011	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-14000000	USD
CY2010	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-22000000	USD
CY2009	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	19000000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Settlements Domestic IncomeTaxReconciliationTaxSettlementsDomestic	-109000000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Settlements Domestic IncomeTaxReconciliationTaxSettlementsDomestic	0	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Settlements Domestic IncomeTaxReconciliationTaxSettlementsDomestic	0	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Contingencies Foreign IncomeTaxReconciliationTaxContingenciesForeign	0	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Contingencies Foreign IncomeTaxReconciliationTaxContingenciesForeign	0	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Contingencies Foreign IncomeTaxReconciliationTaxContingenciesForeign	-38000000	USD
CY2010	wmb	Reduction In State Income Taxes Net Of Federal Benefit ReductionInStateIncomeTaxesNetOfFederalBenefit	43000000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	173000000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	144000000	USD
CY2009	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-48000000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	65000000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	46000000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	2174000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	119000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	170000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	98000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	711000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	145000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	566000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	1608000000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	115000000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	2194000000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	101000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	201000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	459000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	178000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	1735000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	637000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	120000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	59000000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	2063000000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	1978000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	257000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	324000000	USD
CY2010Q4	wmb	Deferred Taxes On Undistributed Earnings Of Certain Foreign Operations That Are No Longer Considered Permanently Invested DeferredTaxesOnUndistributedEarningsOfCertainForeignOperationsThatAreNoLongerConsideredPermanentlyInvested	66000000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	296000000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	40000000	USD
CY2009	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	14000000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	38000000	USD
CY2011	wmb	Reduction Of Income Tax Expense Net Of Federal Tax Expense If Recognized ReductionOfIncomeTaxExpenseNetOfFederalTaxExpenseIfRecognized	41000000	USD
CY2011Q3	wmb	Deferred Taxes On Undistributed Earnings Of Certain Foreign Operations That Are No Longer Considered Permanently Invested DeferredTaxesOnUndistributedEarningsOfCertainForeignOperationsThatAreNoLongerConsideredPermanentlyInvested	66000000	USD
CY2011Q4	wmb	Deferred Tax Asset For Amt Allocable To Wpx DeferredTaxAssetForAmtAllocableToWpx	98000000	USD
CY2011	wmb	Permanently Reinvested Undistributed Earnings From Foreign Subsidiaries PermanentlyReinvestedUndistributedEarningsFromForeignSubsidiaries	388000000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	91000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	26000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-39000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	-44000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	11000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-12000000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	89000000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	-56000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	11000000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	17000000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	15000000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	104000000	USD
CY2011Q3	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	82000000	USD
CY2011Q3	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	77000000	USD
CY2011	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	803000000	USD
CY2010	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	104000000	USD
CY2009	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	206000000	USD
CY2010	wmb	Threshold Of Income Loss From Continuing Operations Attributable To Company Available To Common Stockholders For Dilution Calculation ThresholdOfIncomeLossFromContinuingOperationsAttributableToCompanyAvailableToCommonStockholdersForDilutionCalculation	222000000	USD
CY2009	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3400000	shares
CY2009	wmb	Threshold Of Income Loss From Continuing Operations Attributable To Company Available To Common Stockholders For Dilution Calculation ThresholdOfIncomeLossFromContinuingOperationsAttributableToCompanyAvailableToCommonStockholdersForDilutionCalculation	212000000	USD
CY2011Q4	wmb	Weighted Average Exercise Price Of Options Excluded WeightedAverageExercisePriceOfOptionsExcluded	29.68
CY2010Q4	wmb	Weighted Average Exercise Price Of Options Excluded WeightedAverageExercisePriceOfOptionsExcluded	32.41
CY2009Q4	wmb	Weighted Average Exercise Price Of Options Excluded WeightedAverageExercisePriceOfOptionsExcluded	30.21
CY2010Q4	wmb	Exercise Price Ranges Of Options Excluded Minimum ExercisePriceRangesOfOptionsExcludedMinimum	22.68
CY2009Q4	wmb	Exercise Price Ranges Of Options Excluded Minimum ExercisePriceRangesOfOptionsExcludedMinimum	20.28
CY2011Q4	wmb	Exercise Price Ranges Of Options Excluded Maximum ExercisePriceRangesOfOptionsExcludedMaximum	29.72
CY2010Q4	wmb	Exercise Price Ranges Of Options Excluded Maximum ExercisePriceRangesOfOptionsExcludedMaximum	40.51
CY2009Q4	wmb	Exercise Price Ranges Of Options Excluded Maximum ExercisePriceRangesOfOptionsExcludedMaximum	42.29
CY2011Q4	wmb	Quarter Weighted Average Market Price QuarterWeightedAverageMarketPrice	24.51
CY2010Q4	wmb	Quarter Weighted Average Market Price QuarterWeightedAverageMarketPrice	22.47
CY2009Q4	wmb	Quarter Weighted Average Market Price QuarterWeightedAverageMarketPrice	19.81
CY2011	wmb	Maximum Annual Amount For Purchase Of Common Stock Per Participant Under Employee Stock Purchase Plan MaximumAnnualAmountForPurchaseOfCommonStockPerParticipantUnderEmployeeStockPurchasePlan	15000	USD
CY2011	us-gaap	Defined Benefit Plan Description Of Direction And Pattern Of Change For Assumed Health Care Cost Trend Rate DefinedBenefitPlanDescriptionOfDirectionAndPatternOfChangeForAssumedHealthCareCostTrendRate	decreases
CY2011	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	2000000	USD
CY2011	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents	-2000000	USD
CY2011	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	47000000	USD
CY2011	wmb	Plan Assets Market Related Value PlanAssetsMarketRelatedValue	may be no more than 110 percent or less than 90 percent of the fair value of plan assets at the beginning of the year
CY2012	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed For Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear	0.082	pure
CY2011	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate DefinedBenefitPlanUltimateHealthCareCostTrendRate	0.05	pure
CY2011Q4	us-gaap	Defined Benefit Plan Year That Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearThatRateReachesUltimateTrendRate	2021
CY2011	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation	-39000000	USD
CY2011	wmb	Defined Benefit Plans Asset Management Manager Responsibility Minimum Range Percentage DefinedBenefitPlansAssetManagementManagerResponsibilityMinimumRangePercentage	0.01	pure
CY2011	wmb	Defined Benefit Plans Asset Management Manager Responsibility Maximum Range Percentage DefinedBenefitPlansAssetManagementManagerResponsibilityMaximumRangePercentage	0.16	pure
CY2011	wmb	Description About Loans Require Collateralization By Us Government Securities Cash Or Letters Of Credit DescriptionAboutLoansRequireCollateralizationByUsGovernmentSecuritiesCashOrLettersOfCredit	equaled at least 102 percent of the fair value of the loaned securities plus accrued interest
CY2010Q4	wmb	Defined Benefit Plans Loans Securities Fair Value Pension Plans DefinedBenefitPlansLoansSecuritiesFairValuePensionPlans	116000000	USD
CY2010Q4	wmb	Defined Benefit Plans Loaned Securities Fair Value Other Post Retirement Benefit DefinedBenefitPlansLoanedSecuritiesFairValueOtherPostRetirementBenefit	17000000	USD
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Debt Securities Range Maximum DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecuritiesRangeMaximum	0.44	pure
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Equity Securities Range Minimum DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecuritiesRangeMinimum	0.54	pure
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Equity Securities Range Maximum DefinedBenefitPlanTargetAllocationPercentageOfAssetsEquitySecuritiesRangeMaximum	0.66	pure
CY2011	wmb	Proportion Of Other Postretirement Benefit Plan Assets Subjected To Income Tax ProportionOfOtherPostretirementBenefitPlanAssetsSubjectedToIncomeTax	0.4	pure
CY2011	wmb	Maximum Percentage Of Total Stock Portfolio Invested In Common Stock Of Any One Corporation MaximumPercentageOfTotalStockPortfolioInvestedInCommonStockOfAnyOneCorporation	0.05	pure
CY2011	wmb	Maximum Percentage Of Portfolio Invested In Debt Securities Of Any One Issuer With Exception Of Us Government Guaranteed And Agency Securities MaximumPercentageOfPortfolioInvestedInDebtSecuritiesOfAnyOneIssuerWithExceptionOfUsGovernmentGuaranteedAndAgencySecurities	0.05	pure
CY2011	us-gaap	Defined Benefit Plan Target Allocation Percentage Of Assets Debt Securities Range Minimum DefinedBenefitPlanTargetAllocationPercentageOfAssetsDebtSecuritiesRangeMinimum	0.36	pure
CY2011	wmb	Number Of Active Investment Managers Managing Pension Plans Funds NumberOfActiveInvestmentManagersManagingPensionPlansFunds	9	pure
CY2011	wmb	Number Of Passive Investment Managers Managing Pension Plans Funds NumberOfPassiveInvestmentManagersManagingPensionPlansFunds	1	pure
CY2011	wmb	Number Of Active Investment Managers Managing Other Postretirement Benefit Plans Funds NumberOfActiveInvestmentManagersManagingOtherPostretirementBenefitPlansFunds	5	pure
CY2011Q4	wmb	Defined Benefit Plan Maturities Within Cash Management Fund DefinedBenefitPlanMaturitiesWithinCashManagementFund	P1Y
CY2011	wmb	Defined Contribution Plan Matching Contributions Included In Discontinued Operations Related To Wpx Employees DefinedContributionPlanMatchingContributionsIncludedInDiscontinuedOperationsRelatedToWPXEmployees	5000000	USD
CY2011Q4	us-gaap	Energy Related Inventory Natural Gas Liquids EnergyRelatedInventoryNaturalGasLiquids	97000000	USD
CY2011Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	1000000	USD
CY2011Q4	us-gaap	Other Inventory OtherInventory	71000000	USD
CY2010Q4	us-gaap	Other Inventory OtherInventory	76000000	USD
CY2010Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	62000000	USD
CY2010Q4	us-gaap	Energy Related Inventory Natural Gas Liquids EnergyRelatedInventoryNaturalGasLiquids	87000000	USD
CY2011	wmb	Fixed Income Commingled Funds Maximum Allocation To Bbb Rated Securities FixedIncomeCommingledFundsMaximumAllocationToBBBRatedSecurities	0.1	pure
CY2011Q4	wmb	Fixed Income Commingled Funds Target Duration FixedIncomeCommingledFundsTargetDuration	20	pure
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	28000000	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	26000000	USD
CY2009	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	25000000	USD
CY2010	wmb	Defined Contribution Plan Matching Contributions Included In Discontinued Operations Related To Wpx Employees DefinedContributionPlanMatchingContributionsIncludedInDiscontinuedOperationsRelatedToWPXEmployees	5000000	USD
CY2009	wmb	Defined Contribution Plan Matching Contributions Included In Discontinued Operations Related To Wpx Employees DefinedContributionPlanMatchingContributionsIncludedInDiscontinuedOperationsRelatedToWPXEmployees	5000000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	19082000000	USD
CY2010Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	17795000000	USD
CY2010Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	6041000000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	6502000000	USD
CY2011Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	507000000	USD
CY2010Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	464000000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	-46000000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	4000000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	39000000	USD
CY2011	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	77000000	USD
CY2010	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	-16000000	USD
CY2010	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	2000000	USD
CY2010	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	36000000	USD
CY2010	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-22000000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	573000000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	499000000	USD
CY2009Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	499000000	USD
CY2011	wmb	Offsetting Increase Related To Changes In Timing And Method Of Abandonment On Certain Of Transco Natural Gas Storage Caverns OffsettingIncreaseRelatedToChangesInTimingAndMethodOfAbandonmentOnCertainOfTranscoNaturalGasStorageCaverns	39000000	USD
CY2010	wmb	Offsetting Increase Related To Changes In Timing And Method Of Abandonment On Certain Of Transco Natural Gas Storage Caverns OffsettingIncreaseRelatedToChangesInTimingAndMethodOfAbandonmentOnCertainOfTranscoNaturalGasStorageCaverns	31000000	USD
CY2011Q4	us-gaap	Interest Payable Current InterestPayableCurrent	143000000	USD
CY2010Q4	us-gaap	Interest Payable Current InterestPayableCurrent	162000000	USD
CY2011Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	24000000	USD
CY2010Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	187000000	USD
CY2011Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	271000000	USD
CY2010Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	208000000	USD
CY2011Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	127000000	USD
CY2010Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	146000000	USD
CY2011Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	66000000	USD
CY2010Q4	us-gaap	Asset Retirement Obligation Current AssetRetirementObligationCurrent	35000000	USD
CY2011Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	-32000000	USD
CY2011Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	8722000000	USD
CY2010Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	-38000000	USD
CY2010Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	9108000000	USD
CY2011Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	0	USD
CY2011Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	21000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	352000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	750000000	USD
CY2011Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	375000000	USD
CY2011	us-gaap	Interest Expense Debt InterestExpenseDebt	599000000	USD
CY2010	us-gaap	Interest Expense Debt InterestExpenseDebt	614000000	USD
CY2009	us-gaap	Interest Expense Debt InterestExpenseDebt	592000000	USD
CY2011Q4	wmb	Restricted Net Assets Threshold RestrictedNetAssetsThreshold	0.25	pure
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	43000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	35000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	33000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	29000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	26000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	148000000	USD
CY2011Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	314000000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	49000000	USD
CY2010	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	45000000	USD
CY2009	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	45000000	USD
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	.775
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	.485
CY2009	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	.44
CY2010	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	2000000	USD
CY2009	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	28000000	USD
CY2007Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights	50
CY2007Q4	wmb	Share Of Series Junior Participating Preferred Stock Available Under Each Right ShareOfSeriesJuniorParticipatingPreferredStockAvailableUnderEachRight	<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:14.4px;">one two-hundredth </font></p>
CY2007Q4	wmb	Minimum Percentage For Exercising Right MinimumPercentageForExercisingRight	0.15	pure
CY2007Q4	wmb	Threshold Percentage To Divest Of Common Stock ThresholdPercentageToDivestOfCommonStock	0.149	pure
CY2007Q4	wmb	Redeemed Price If Rights Have Not Exercised And Expired In2014 RedeemedPriceIfRightsHaveNotExercisedAndExpiredIn2014	.01	USD
CY2007Q4	wmb	Minimum Percentage Of Assets Cash Flow And Earning Power Sold MinimumPercentageOfAssetsCashFlowAndEarningPowerSold	0.5	pure
CY2007Q4	wmb	Each Holder Of Right Shall Have Right To Receive Upon Exercise Common Stock Of Acquiring Company Having Value EachHolderOfRightShallHaveRightToReceiveUponExerciseCommonStockOfAcquiringCompanyHavingValue	<p style='margin-top:0pt; margin-bottom:0pt'><font style="font-family:Times New Roman;font-size:10pt;margin-left:14.4px;">equal to two times the exercise price of the right</font></p>
CY2011	us-gaap	Stock Issued During Period Value Conversion Of Convertible Securities StockIssuedDuringPeriodValueConversionOfConvertibleSecurities	14000000	USD
CY2010	us-gaap	Stock Issued During Period Shares Conversion Of Convertible Securities StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities	1000000	shares
CY2009	us-gaap	Stock Issued During Period Shares Conversion Of Convertible Securities StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities	3000000	shares
CY2011	us-gaap	Stock Issued During Period Shares Conversion Of Convertible Securities StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities	1000000	shares
CY2011	wmb	Number Of Shares Purchases By Employees NumberOfSharesPurchasesByEmployees	239000	shares
CY2011	wmb	Average Price Of Shares Purchased AveragePriceOfSharesPurchased	21.19
CY2011	wmb	Number Of Shares Eligible For Employee To Purchase Per Offering Period NumberOfSharesEligibleForEmployeeToPurchasePerOfferingPeriod	750	shares
CY2010Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	11000000	shares
CY2011Q4	wmb	Shares Available For Purchase Under Employee Stock Purchase Plan SharesAvailableForPurchaseUnderEmployeeStockPurchasePlan	809000	shares
CY2011Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	35000000	USD
CY2011Q4	wmb	Estimated Forfeitures Under Employee Stock Based Awards EstimatedForfeituresUnderEmployeeStockBasedAwards	2000000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition	1.8	pure
CY2011Q4	wmb	Share Based Compensation Arrangement By Share Based Payment Award Employee Stock Purchase Plan Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeeStockPurchasePlanNumberOfSharesAuthorized	2000000	shares
CY2011	wmb	Percentage Of Purchase Price Is Lower Of Closing Price Of Either First Or Last Day Of Offering Period PercentageOfPurchasePriceIsLowerOfClosingPriceOfEitherFirstOrLastDayOfOfferingPeriod	0.85	pure
CY2007Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	19000000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	35000000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	20000000	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	12300000	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	14.18
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	900000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	24.21
CY2011	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	-3300000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	11.13
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod	-300000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice	28.56
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	9600000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	15.63
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	111000000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	7800000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	14.87
CY2011Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	97000000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	55000000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	20000000	USD
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	2000000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	21000000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	7000000	USD
CY2009	us-gaap	Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	1000000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	45000000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	7000000	USD
CY2009	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	2000000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	-900000	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	26.46
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	7.70
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	28000000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	29000000	USD
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	35000000	USD
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	5200000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	14.12
CY2011	wmb	Range Of Vested Shares Based On Extent To Which Certain Financial Targets Are Achieved RangeOfVestedSharesBasedOnExtentToWhichCertainFinancialTargetsAreAchieved	zero percent to 200 percent of the original grant amount
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	16.37
CY2011Q4	wmb	Performance Based Nonvested Restricted Stock Units As Percent Of Total Nonvested Restricted Stock Units Outstanding PerformanceBasedNonvestedRestrictedStockUnitsAsPercentOfTotalNonvestedRestrictedStockUnitsOutstanding	0.3	pure
CY2011Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm1	4.7	pure
CY2011Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Remaining Contractual Term1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm1	3.9	pure
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	6.28
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	5.71
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	4.56
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	6.5	pure
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	6.5	pure
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	6.5	pure
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.036	pure
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.026	pure
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.016	pure
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.608	pure
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.390	pure
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Weighted Average Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate	0.346	pure
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.028	pure
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.030	pure
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.023	pure
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	5200000	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	12.91
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	1400000	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	23.31
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	-200000	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue	15.16
CY2011	wmb	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriod	-300000	shares
CY2011	wmb	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Cancelled In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageGrantDateFairValue	0
CY2011Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	47000000	USD
CY2011Q4	wmb	Commitments For Construction And Acquisition Of Property Plant And Equipment CommitmentsForConstructionAndAcquisitionOfPropertyPlantAndEquipment	830000000	USD
CY2011Q4	us-gaap	Loss Contingency Range Of Possible Loss Maximum LossContingencyRangeOfPossibleLossMaximum	32000000	USD
CY2011Q4	wmb	Percentage Of Long Term Debt Publicly Traded PercentageOfLongTermDebtPubliclyTraded	0.96	pure
CY2010Q4	wmb	Percentage Of Long Term Debt Publicly Traded PercentageOfLongTermDebtPubliclyTraded	1	pure
CY2011	wmb	Expected Duration Of Future Net Cash Flows For Derivatives Classified As Current ExpectedDurationOfFutureNetCashFlowsForDerivativesClassifiedAsCurrent	P12M
CY2011	us-gaap	Gain Loss From Components Excluded From Assessment Of Cash Flow Hedge Effectiveness Net GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet	0	USD
CY2011	wmb	Customer Accounted For Ten Percent Of Consolidated Revenues CustomerAccountedForTenPercentOfConsolidatedRevenues	1	pure
CY2010	wmb	Customer Accounted For Ten Percent Of Consolidated Revenues CustomerAccountedForTenPercentOfConsolidatedRevenues	1	pure
CY2009	wmb	Customer Accounted For Ten Percent Of Consolidated Revenues CustomerAccountedForTenPercentOfConsolidatedRevenues	0	pure
CY2011	us-gaap	Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet	-18000000	USD
CY2010	us-gaap	Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet	-12000000	USD
CY2010	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-13000000	USD
CY2011	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	-18000000	USD
CY2011	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	0	USD
CY2010	us-gaap	Derivative Instruments Gain Loss Recognized In Income Ineffective Portion And Amount Excluded From Effectiveness Testing Net DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet	0	USD
CY2011	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	0	USD
CY2011Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	0	USD
CY2010Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	0	USD
CY2011Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	38000000	USD
CY2010Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	39000000	USD
CY2011Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	34000000	USD
CY2010Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	35000000	USD
CY2011Q4	wmb	Sale Of Ngls And Related Products And Services SaleOfNglsAndRelatedProductsAndServices	446000000	USD
CY2011Q4	wmb	Transportation Of Natural Gas And Related Products TransportationOfNaturalGasAndRelatedProducts	164000000	USD
CY2011Q4	wmb	Other Receivable OtherReceivable	27000000	USD
CY2010Q4	wmb	Sale Of Ngls And Related Products And Services SaleOfNglsAndRelatedProductsAndServices	345000000	USD
CY2010Q4	wmb	Transportation Of Natural Gas And Related Products TransportationOfNaturalGasAndRelatedProducts	149000000	USD
CY2010Q4	wmb	Other Receivable OtherReceivable	3000000	USD
CY2011Q4	wmb	Long Lived Assets LongLivedAssets	12624000000	USD
CY2010Q4	wmb	Long Lived Assets LongLivedAssets	11792000000	USD
CY2009Q4	wmb	Long Lived Assets LongLivedAssets	11374000000	USD
CY2011Q4	wmb	Entity Wide Revenue Major Customer Percentage EntityWideRevenueMajorCustomerPercentage	0.17	pure
CY2010Q4	wmb	Entity Wide Revenue Major Customer Percentage EntityWideRevenueMajorCustomerPercentage	0.15	pure
CY2011Q4	wmb	Equity Method Investments Including Discontinued Operations EquityMethodInvestmentsIncludingDiscontinuedOperations	1390000000	USD
CY2010Q4	wmb	Equity Method Investments Including Discontinued Operations EquityMethodInvestmentsIncludingDiscontinuedOperations	1342000000	USD
CY2009Q4	wmb	Equity Method Investments Including Discontinued Operations EquityMethodInvestmentsIncludingDiscontinuedOperations	884000000	USD
CY2011	us-gaap	Entity Wide Disclosure On Geographic Areas Revenue From External Customers Attributed To Entitys Country Of Domicile EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile	7728000000	USD
CY2010	us-gaap	Entity Wide Disclosure On Geographic Areas Revenue From External Customers Attributed To Entitys Country Of Domicile EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile	6470000000	USD
CY2009	us-gaap	Entity Wide Disclosure On Geographic Areas Revenue From External Customers Attributed To Entitys Country Of Domicile EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToEntitysCountryOfDomicile	5163000000	USD
CY2009	us-gaap	Entity Wide Disclosure On Geographic Areas Revenue From External Customers Attributed To Foreign Countries EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries	115000000	USD
CY2011	us-gaap	Entity Wide Disclosure On Geographic Areas Revenue From External Customers Attributed To Foreign Countries EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries	202000000	USD
CY2010	us-gaap	Entity Wide Disclosure On Geographic Areas Revenue From External Customers Attributed To Foreign Countries EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountries	168000000	USD
CY2011	us-gaap	Discontinued Operation Intercompany Amounts With Discontinued Operation Before Disposal Transaction Revenue DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionRevenue	310000000	USD
CY2010	us-gaap	Discontinued Operation Intercompany Amounts With Discontinued Operation Before Disposal Transaction Revenue DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionRevenue	264000000	USD
CY2009	us-gaap	Discontinued Operation Intercompany Amounts With Discontinued Operation Before Disposal Transaction Revenue DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionRevenue	164000000	USD
CY2009	us-gaap	Discontinued Operation Intercompany Amounts With Discontinued Operation Before Disposal Transaction Costs DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionCosts	541000000	USD
CY2010	us-gaap	Discontinued Operation Intercompany Amounts With Discontinued Operation Before Disposal Transaction Costs DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionCosts	797000000	USD
CY2011	us-gaap	Discontinued Operation Intercompany Amounts With Discontinued Operation Before Disposal Transaction Costs DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionCosts	845000000	USD
CY2011	us-gaap	Revenues From External Customers RevenuesFromExternalCustomers	7930000000	USD
CY2011	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	0	USD
CY2011	wmb	Segment Profit Loss SegmentProfitLoss	2216000000	USD
CY2011	wmb	Segment Operating Income Loss SegmentOperatingIncomeLoss	2054000000	USD
CY2010	us-gaap	Revenues From External Customers RevenuesFromExternalCustomers	6638000000	USD
CY2010	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	0	USD
CY2010	wmb	Segment Profit Loss SegmentProfitLoss	1814000000	USD
CY2010	wmb	Segment Operating Income Loss SegmentOperatingIncomeLoss	1628000000	USD
CY2009	us-gaap	Revenues From External Customers RevenuesFromExternalCustomers	5278000000	USD
CY2009	us-gaap	Revenues From Transactions With Other Operating Segments Of Same Entity RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity	0	USD
CY2009	wmb	Segment Profit Loss SegmentProfitLoss	1313000000	USD
CY2009	wmb	Segment Operating Income Loss SegmentOperatingIncomeLoss	1270000000	USD
CY2011	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	1530000000	USD
CY2010	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	1033000000	USD
CY2009	us-gaap	Additions To Noncurrent Assets AdditionsToNoncurrentAssets	1092000000	USD
CY2011	wmb	Depreciation And Amortization Excluding Discontinued Operations DepreciationAndAmortizationExcludingDiscontinuedOperations	662000000	USD
CY2010	wmb	Depreciation And Amortization Excluding Discontinued Operations DepreciationAndAmortizationExcludingDiscontinuedOperations	612000000	USD
CY2009	wmb	Depreciation And Amortization Excluding Discontinued Operations DepreciationAndAmortizationExcludingDiscontinuedOperations	593000000	USD
CY2012Q1	us-gaap	Partners Capital Account Units Sold In Public Offering PartnersCapitalAccountUnitsSoldInPublicOffering	7000000	shares
CY2012Q1	us-gaap	Equity Issuance Dollar Amount Per Share EquityIssuanceDollarAmountPerShare	62.81
CY2012Q1	us-gaap	Business Acquisition Percentage Of Voting Interests Acquired BusinessAcquisitionPercentageOfVotingInterestsAcquired	1	pure
CY2012Q1	us-gaap	Business Acquisition Cost Of Acquired Entity Cash Paid BusinessAcquisitionCostOfAcquiredEntityCashPaid	325000000	USD
CY2012Q1	wmb	Business Acquistion Number Of Units Issued BusinessAcquistionNumberOfUnitsIssued	7500000	shares
CY2012Q1	us-gaap	Business Acquisition Cost Of Acquired Entity Equity Interests Issued And Issuable BusinessAcquisitionCostOfAcquiredEntityEquityInterestsIssuedAndIssuable	465000000	USD
CY2012Q1	us-gaap	Partners Capital Account Units Sold In Public Offering PartnersCapitalAccountUnitsSoldInPublicOffering	1050000	shares
CY2012Q1	us-gaap	Equity Issuance Dollar Amount Per Share EquityIssuanceDollarAmountPerShare	62.81

Files In Submission

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0001193125-12-082513-index-headers.html	Edgar Link	pending
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0001193125-12-082513.txt	Edgar Link	pending
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wmb-20111231.xml	Edgar Link	completed
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wmb-20111231_pre.xml	Edgar Link	unprocessable

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$WMB
WILLIAMS COMPANIES, INC. Stock $wmb

2010 Q4 Form 10-K Financial Statement

#000119312512082513 Filed on February 28, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WMB WILLIAMS COMPANIES, INC. Stock $wmb

2010 Q4 Form 10-K Financial Statement

#000119312512082513 Filed on February 28, 2012

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WMB
WILLIAMS COMPANIES, INC. Stock $wmb