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Earnings (Loss) Per Common Share from Continuing Operations (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings (loss) per common share from continuing operations    
Net Income (Loss) Attributable to Parent $ 70us-gaap_NetIncomeLoss $ 140us-gaap_NetIncomeLoss
Basic weighted-average shares 748,079us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 684,773us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted-average shares 752,028us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 688,904us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings (loss) per common share from continuing operations:    
Earnings Per Share, Basic $ 0.09us-gaap_EarningsPerShareBasic $ 0.20us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted $ 0.09us-gaap_EarningsPerShareDiluted $ 0.20us-gaap_EarningsPerShareDiluted
Nonvested restricted stock units [Member]    
Effect of dilutive securities:    
Incremental common shares attributable to share-based payment arrangements under effects of dilutive securities item 2,217us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ wmb_EarningsPerShareAxis
= us-gaap_RestrictedStockMember
2,096us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ wmb_EarningsPerShareAxis
= us-gaap_RestrictedStockMember
Stock options [Member]    
Effect of dilutive securities:    
Incremental common shares attributable to share-based payment arrangements under effects of dilutive securities item 1,715us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ wmb_EarningsPerShareAxis
= us-gaap_EmployeeStockOptionMember
2,017us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
/ wmb_EarningsPerShareAxis
= us-gaap_EmployeeStockOptionMember
Convertible debentures [Member]    
Effect of dilutive securities:    
Incremental dilutive shares, Convertible debt 17us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ wmb_EarningsPerShareAxis
= us-gaap_ConvertibleDebtSecuritiesMember
18us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ wmb_EarningsPerShareAxis
= us-gaap_ConvertibleDebtSecuritiesMember