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Other Income and Expense (Details Textuals) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Allowance for Funds Used During Construction, Capitalized Cost of Equity $ 44us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity $ 22us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity $ 21us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
Restructuring charges for corporate realignment     26us-gaap_RestructuringCharges
Employee costs [Member] | Selling, General and Administrative Expenses [Member]      
Segment Reporting Information [Line Items]      
Business Combination, Integration Related Costs 15us-gaap_BusinessCombinationIntegrationRelatedCosts
/ wmb_BusinessCombinationIntegrationRelatedCostsAxis
= wmb_EmployeeCostsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
   
Employee costs [Member] | Operation and maintenance [Member]      
Segment Reporting Information [Line Items]      
Business Combination, Integration Related Costs 15us-gaap_BusinessCombinationIntegrationRelatedCosts
/ wmb_BusinessCombinationIntegrationRelatedCostsAxis
= wmb_EmployeeCostsMember
/ us-gaap_IncomeStatementLocationAxis
= wmb_OperationAndMaintenanceMember
   
Merger [Member]      
Segment Reporting Information [Line Items]      
Business Combination, Integration Related Costs 11us-gaap_BusinessCombinationIntegrationRelatedCosts
/ wmb_BusinessCombinationIntegrationRelatedCostsAxis
= wmb_MergerMember
   
Other Restructuring [Member]      
Segment Reporting Information [Line Items]      
Business Combination, Integration Related Costs 10us-gaap_BusinessCombinationIntegrationRelatedCosts
/ wmb_BusinessCombinationIntegrationRelatedCostsAxis
= us-gaap_OtherRestructuringMember
   
Williams Partners [Member]      
Segment Reporting Information [Line Items]      
Gain Related To Claims From Purchase Of Business In A Prior Period 154wmb_GainRelatedToClaimsFromPurchaseOfBusinessInAPriorPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
0wmb_GainRelatedToClaimsFromPurchaseOfBusinessInAPriorPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
0wmb_GainRelatedToClaimsFromPurchaseOfBusinessInAPriorPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
Project development costs 2us-gaap_CostsIncurredDevelopmentCosts
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
4us-gaap_CostsIncurredDevelopmentCosts
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
21us-gaap_CostsIncurredDevelopmentCosts
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
Williams Partners [Member] | Geismar Incident [Member]      
Segment Reporting Information [Line Items]      
Insurance deductible expense   13wmb_InsuranceDeductibleExpense
/ us-gaap_BusinessInterruptionLossAxis
= wmb_GeismarIncidentMember
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
 
Insurance Recoveries 246us-gaap_InsuranceRecoveries
/ us-gaap_BusinessInterruptionLossAxis
= wmb_GeismarIncidentMember
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
50us-gaap_InsuranceRecoveries
/ us-gaap_BusinessInterruptionLossAxis
= wmb_GeismarIncidentMember
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
 
Insurable Expense in Excess of our Deductibles 14wmb_InsurableExpenseinExcessofourDeductibles
/ us-gaap_BusinessInterruptionLossAxis
= wmb_GeismarIncidentMember
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
10wmb_InsurableExpenseinExcessofourDeductibles
/ us-gaap_BusinessInterruptionLossAxis
= wmb_GeismarIncidentMember
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
 
Williams Partners [Member] | Geismar Incident [Member] | Property Damage And Business Interruption [Member]      
Segment Reporting Information [Line Items]      
Maximum insurance recoverable amount 500wmb_MaximumInsuranceRecoverableAmount
/ us-gaap_BusinessInterruptionLossAxis
= wmb_GeismarIncidentMember
/ wmb_ComponentOfInsurancePolicy1Axis
= wmb_PropertyDamageAndBusinessInterruptionMember
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
   
Williams Partners [Member] | Geismar Incident [Member] | Property Damage [Member]      
Segment Reporting Information [Line Items]      
Insurance deductibles 10wmb_InsuranceDeductibles
/ us-gaap_BusinessInterruptionLossAxis
= wmb_GeismarIncidentMember
/ wmb_ComponentOfInsurancePolicy1Axis
= wmb_PropertyDamageMember
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
   
Williams Partners [Member] | Geismar Incident [Member] | Business Interruption [Member]      
Segment Reporting Information [Line Items]      
Duration of waiting period before business interrutpion coverage begins 60 days    
Williams Partners [Member] | Geismar Incident [Member] | General Liability [Member]      
Segment Reporting Information [Line Items]      
Maximum insurance recoverable amount 610wmb_MaximumInsuranceRecoverableAmount
/ us-gaap_BusinessInterruptionLossAxis
= wmb_GeismarIncidentMember
/ wmb_ComponentOfInsurancePolicy1Axis
= us-gaap_GeneralLiabilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
   
Insurance deductibles 2wmb_InsuranceDeductibles
/ us-gaap_BusinessInterruptionLossAxis
= wmb_GeismarIncidentMember
/ wmb_ComponentOfInsurancePolicy1Axis
= us-gaap_GeneralLiabilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
   
Williams Partners [Member] | Geismar Incident [Member] | Workers Compensation [Member]      
Segment Reporting Information [Line Items]      
Insurance deductibles 1wmb_InsuranceDeductibles
/ us-gaap_BusinessInterruptionLossAxis
= wmb_GeismarIncidentMember
/ wmb_ComponentOfInsurancePolicy1Axis
= wmb_WorkersCompensationMember
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsPartnersMember
   
Williams NGL & Petchem Services [Member] | Bluegrass Pipeline Company Llc [Member]      
Segment Reporting Information [Line Items]      
Project development costs $ 18us-gaap_CostsIncurredDevelopmentCosts
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_BluegrassPipelineCompanyLlcMember
/ us-gaap_StatementBusinessSegmentsAxis
= wmb_WilliamsNglAndPetchemServicesMember