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Long-Term Debt Issuances and Retirements (Details 1) (USD $)
In Millions, unless otherwise specified
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 15, 2015
Feb. 15, 2015
Mar. 03, 2015
Debt Instrument [Line Items]          
Payments of long-term debt $ 3,648us-gaap_RepaymentsOfLongTermDebt $ 0us-gaap_RepaymentsOfLongTermDebt      
3.6% Senior Unsecured Notes due 2022 [Member] | Williams Partners L.P. [Member]          
Debt Instrument [Line Items]          
Long-term debt face amount         1,250us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= wmb_A3.6SeniorUnsecuredNotesdue2022Member
/ dei_LegalEntityAxis
= wmb_WilliamsPartnersL.P.Member
Long-term debt interest rate         3.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wmb_A3.6SeniorUnsecuredNotesdue2022Member
/ dei_LegalEntityAxis
= wmb_WilliamsPartnersL.P.Member
4% Senior Unsecured Notes due 2025 [Member] | Williams Partners L.P. [Member]          
Debt Instrument [Line Items]          
Long-term debt face amount         750us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= wmb_A4SeniorUnsecuredNotesdue2025Member
/ dei_LegalEntityAxis
= wmb_WilliamsPartnersL.P.Member
Long-term debt interest rate         4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wmb_A4SeniorUnsecuredNotesdue2025Member
/ dei_LegalEntityAxis
= wmb_WilliamsPartnersL.P.Member
5.1% Senior Unsecured Notes due 2045 [Member] | Williams Partners L.P. [Member]          
Debt Instrument [Line Items]          
Long-term debt face amount         1,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= wmb_A5.1SeniorUnsecuredNotesdue2045Member
/ dei_LegalEntityAxis
= wmb_WilliamsPartnersL.P.Member
Long-term debt interest rate         5.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wmb_A5.1SeniorUnsecuredNotesdue2045Member
/ dei_LegalEntityAxis
= wmb_WilliamsPartnersL.P.Member
5.875% Senior Unsecured Notes due 2021 [Member] | Williams Partners L.P. [Member]          
Debt Instrument [Line Items]          
Long-term debt due within one year 798us-gaap_LongTermDebtCurrent
/ us-gaap_DebtInstrumentAxis
= wmb_A5.875SeniorUnsecuredNotesdue2021Member
/ dei_LegalEntityAxis
= wmb_WilliamsPartnersL.P.Member
       
5.875% Senior Unsecured Notes due 2021 [Member] | Williams Partners L.P. [Member] | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Long-term debt interest rate     5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wmb_A5.875SeniorUnsecuredNotesdue2021Member
/ dei_LegalEntityAxis
= wmb_WilliamsPartnersL.P.Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Payments of long-term debt     783us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= wmb_A5.875SeniorUnsecuredNotesdue2021Member
/ dei_LegalEntityAxis
= wmb_WilliamsPartnersL.P.Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Long-term debt retired     750us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= wmb_A5.875SeniorUnsecuredNotesdue2021Member
/ dei_LegalEntityAxis
= wmb_WilliamsPartnersL.P.Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
3.8% Senior Unsecured Notes due 2015 [Member]          
Debt Instrument [Line Items]          
Long-term debt interest rate       3.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= wmb_A3.8SeniorUnsecuredNotesdue2015Member
 
Long-term debt retired       $ 750us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= wmb_A3.8SeniorUnsecuredNotesdue2015Member