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Investing Activities (Details) (USD $)
 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Dec. 20, 2012
Dec. 31, 2014
Mar. 31, 2013
Dec. 31, 2010
Investing income                
Gain on remeasurement of equity-method investment $ 2,544,000,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain [1] $ 0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain [1] $ 0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain [1]          
Equity earnings (losses) 144,000,000us-gaap_IncomeLossFromEquityMethodInvestments [1] 134,000,000us-gaap_IncomeLossFromEquityMethodInvestments [1] 111,000,000us-gaap_IncomeLossFromEquityMethodInvestments [1]          
Income (loss) from investments 0us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal [1] 28,000,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal [1] 49,000,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal [1]          
Interest income and other 43,000,000us-gaap_InvestmentIncomeInterest 53,000,000us-gaap_InvestmentIncomeInterest 28,000,000us-gaap_InvestmentIncomeInterest          
Total investing income 2,731,000,000wmb_InvestingIncomeLoss 215,000,000wmb_InvestingIncomeLoss 188,000,000wmb_InvestingIncomeLoss          
Investments                
Equity Method Investments 8,400,000,000us-gaap_EquityMethodInvestments 4,360,000,000us-gaap_EquityMethodInvestments       8,400,000,000us-gaap_EquityMethodInvestments    
Dividends and distributions                
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity 3,700,000,000us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity         3,700,000,000us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity    
Equity Method Investment, payments to purchase or contributions 482,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments 455,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments 2,651,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments          
Equity method investment, dividends or distributions 409,000,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital 247,000,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital 173,000,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital          
Related Party Transactions [Abstract]                
Related Party Transaction, Purchases from Related Party 197,000,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty 161,000,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty 186,000,000us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty          
Related party transactions, payable 13,000,000us-gaap_AccountsPayableRelatedPartiesCurrent 13,000,000us-gaap_AccountsPayableRelatedPartiesCurrent       13,000,000us-gaap_AccountsPayableRelatedPartiesCurrent    
Related Party Transaction, Expenses from Transactions with Related Party 75,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty 67,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty 75,000,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty          
Summarized Financial Position of Equity Method Investments                
Current assets 599,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets 689,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets       599,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets    
Noncurrent assets 9,135,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets 13,621,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets       9,135,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets    
Current liabilities (850,000,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities (573,000,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities       (850,000,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities    
Noncurrent liabilities (954,000,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities (4,563,000,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities       (954,000,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities    
Noncontrolling interests 0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest (254,000,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest       0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest    
Summarized Results of Operations of Equity Method Investments                
Gross revenue 1,623,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue 2,406,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue 1,821,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue          
Operating income 534,000,000wmb_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncome 699,000,000wmb_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncome 557,000,000wmb_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncome          
Net income 460,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss 627,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss 488,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss          
Appalachia Midstream Services, LLC [Member]                
Investments                
Equity Method Investments 3,033,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		 [2] 0us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		 [2]       3,033,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		 [2]    
Number Of Gathering Systems 11wmb_NumberOfGatheringSystems
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		              
Dividends and distributions                
Equity Method Investment, payments to purchase or contributions 84,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		 0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		 0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		          
Equity method investment, dividends or distributions 120,000,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		 0us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		 0us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		          
Appalachia Midstream Services, LLC [Member] | Minimum [Member]                
Investments                
Equity Method Investment, Ownership Percentage 33.75%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		         33.75%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		    
Appalachia Midstream Services, LLC [Member] | Maximum [Member]                
Investments                
Equity Method Investment, Ownership Percentage 67.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		         67.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		    
Appalachia Midstream Services, LLC [Member] | Average [Member]                
Investments                
Equity Method Investment, Ownership Percentage 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		         45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember		    
Appalachia Midstream Services, LLC [Member] | Application Of The Equity-Method Of Accounting [Member] | Minimum [Member]                
Investments                
Equity Method Investment, Ownership Percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember
/ us-gaap_UnusualOrInfrequentItemAxis
= wmb_ApplicationOfTheEquityMethodOfAccountingMember		         50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AppalachiaMidstreamServicesLLCMember
/ us-gaap_UnusualOrInfrequentItemAxis
= wmb_ApplicationOfTheEquityMethodOfAccountingMember		    
Delaware Basin Gas Gathering System [Member]                
Investments                
Equity Method Investments 1,478,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DelawareBasinGasGatheringSystemMember		 [2] 0us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DelawareBasinGasGatheringSystemMember		 [2]       1,478,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DelawareBasinGasGatheringSystemMember		 [2]    
Equity Method Investment, Ownership Percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DelawareBasinGasGatheringSystemMember		         50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DelawareBasinGasGatheringSystemMember		    
Utica East Ohio Midstream, LLC [Member]                
Investments                
Equity Method Investments 1,411,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_UticaEastOhioMidstreamLLCMember		 [2] 0us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_UticaEastOhioMidstreamLLCMember		 [2]       1,411,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_UticaEastOhioMidstreamLLCMember		 [2]    
Equity Method Investment, Ownership Percentage 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_UticaEastOhioMidstreamLLCMember		         49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_UticaEastOhioMidstreamLLCMember		    
Dividends and distributions                
Equity Method Investment, payments to purchase or contributions 57,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_UticaEastOhioMidstreamLLCMember		 0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_UticaEastOhioMidstreamLLCMember		 0us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_UticaEastOhioMidstreamLLCMember		          
Discovery Producer Services LLC [Member]                
Investments                
Equity Method Investments 602,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DiscoveryProducerServicesLlcMember		 [3] 527,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DiscoveryProducerServicesLlcMember		 [3]       602,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DiscoveryProducerServicesLlcMember		 [3]    
Equity Method Investment, Ownership Percentage 60.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DiscoveryProducerServicesLlcMember		         60.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DiscoveryProducerServicesLlcMember		    
Dividends and distributions                
Equity Method Investment, payments to purchase or contributions 106,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DiscoveryProducerServicesLlcMember		 193,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DiscoveryProducerServicesLlcMember		 169,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DiscoveryProducerServicesLlcMember		          
Equity method investment, dividends or distributions 36,000,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DiscoveryProducerServicesLlcMember		 12,000,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DiscoveryProducerServicesLlcMember		 21,000,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DiscoveryProducerServicesLlcMember		          
Discovery Producer Services LLC [Member] | Proportionate Share Of Amounts Remaining For Capital Projects [Member]                
Dividends and distributions                
Expected contributions to equity method investees for expansion projects 98,000,000us-gaap_OtherCommitment
/ us-gaap_OtherCommitmentsAxis
= wmb_ProportionateShareOfAmountsRemainingForCapitalProjectsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DiscoveryProducerServicesLlcMember		         98,000,000us-gaap_OtherCommitment
/ us-gaap_OtherCommitmentsAxis
= wmb_ProportionateShareOfAmountsRemainingForCapitalProjectsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_DiscoveryProducerServicesLlcMember		    
Laurel Mountain Midstream, LLC [Member]                
Investments                
Equity Method Investments 459,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_LaurelMountainMidstreamLlcMember		 [3] 481,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_LaurelMountainMidstreamLlcMember		 [3]       459,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_LaurelMountainMidstreamLlcMember		 [3]    
Equity Method Investment, Ownership Percentage 69.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_LaurelMountainMidstreamLlcMember		         69.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_LaurelMountainMidstreamLlcMember		    
Dividends and distributions                
Equity Method Investment, payments to purchase or contributions 12,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_LaurelMountainMidstreamLlcMember		 42,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_LaurelMountainMidstreamLlcMember		 174,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_LaurelMountainMidstreamLlcMember		          
Equity method investment, dividends or distributions 39,000,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_LaurelMountainMidstreamLlcMember		 0us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_LaurelMountainMidstreamLlcMember		 0us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_LaurelMountainMidstreamLlcMember		          
Laurel Mountain Midstream, LLC [Member] | Proportionate Share Of Amounts Remaining For Capital Projects [Member]                
Dividends and distributions                
Expected contributions to equity method investees for expansion projects 92,000,000us-gaap_OtherCommitment
/ us-gaap_OtherCommitmentsAxis
= wmb_ProportionateShareOfAmountsRemainingForCapitalProjectsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_LaurelMountainMidstreamLlcMember		         92,000,000us-gaap_OtherCommitment
/ us-gaap_OtherCommitmentsAxis
= wmb_ProportionateShareOfAmountsRemainingForCapitalProjectsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_LaurelMountainMidstreamLlcMember		    
Overland Pass Pipeline Company LLC [Member]                
Investments                
Equity Method Investments 453,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_OverlandPassPipelineCompanyLlcMember		 452,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_OverlandPassPipelineCompanyLlcMember		       453,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_OverlandPassPipelineCompanyLlcMember		    
Equity Method Investment, Ownership Percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_OverlandPassPipelineCompanyLlcMember		         50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_OverlandPassPipelineCompanyLlcMember		    
Dividends and distributions                
Equity method investment, dividends or distributions 27,000,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_OverlandPassPipelineCompanyLlcMember		 27,000,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_OverlandPassPipelineCompanyLlcMember		 28,000,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_OverlandPassPipelineCompanyLlcMember		          
Caiman Energy II, LLC [Member]                
Investments                
Equity Method Investments 432,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_CaimanEnergyIiLlcMember		 [3] 256,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_CaimanEnergyIiLlcMember		 [3]       432,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_CaimanEnergyIiLlcMember		 [3]    
Equity Method Investment, Ownership Percentage 58.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_CaimanEnergyIiLlcMember		         58.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_CaimanEnergyIiLlcMember		    
Dividends and distributions                
Equity Method Investment, payments to purchase or contributions 175,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_CaimanEnergyIiLlcMember		 192,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_CaimanEnergyIiLlcMember		 69,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_CaimanEnergyIiLlcMember		          
Gulfstream Natural Gas System, L.L.C.[Member]                
Investments                
Equity Method Investments 317,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_GulfstreamNaturalGasSystemLlcMember		 333,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_GulfstreamNaturalGasSystemLlcMember		       317,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_GulfstreamNaturalGasSystemLlcMember		    
Equity Method Investment, Ownership Percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_GulfstreamNaturalGasSystemLlcMember		         50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_GulfstreamNaturalGasSystemLlcMember		    
Dividends and distributions                
Equity method investment, dividends or distributions 81,000,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_GulfstreamNaturalGasSystemLlcMember		 81,000,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_GulfstreamNaturalGasSystemLlcMember		 79,000,000us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_GulfstreamNaturalGasSystemLlcMember		          
Access Midstream Partners [Member]                
Investing income                
Equity earnings (losses)   93,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AccessMidstreamPartnersMember		   23,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AccessMidstreamPartnersMember		        
Income (loss) from investments   31,000,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= wmb_AccessMidstreamPartnersMember		            
Investments                
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[1] Items also included in Segment profit (loss). (See Note 19 – Segment Disclosures.)
[2] We acquired these investments in the ACMP Acquisition. (Note 2 – Acquisitions.) As discussed in Note 1 – Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies, the Appalachia Midstream Investments include investments in 11 different gathering systems in the Marcellus Shale. Ownership interests range from 33.75 percent to 67.50 percent, resulting in an overall approximate average interest of 45 percent. For those investments where we own in excess of 50 percent, we apply the equity-method of accounting due to the significant participation rights of our partners such that we do not control.
[3] We account for these investments under the equity method of accounting due to the significant participatory rights of our partners such that we do not control or are otherwise not the primary beneficiary of the investments.