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Consolidated Balance Sheets (USD $)
Mar. 31, 2015
Dec. 31, 2014
Current assets    
Cash and cash equivalents $ 59,823,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 67,213,000us-gaap_CashAndCashEquivalentsAtCarryingValue [1]
Accounts receivable, net 144,119,000us-gaap_AccountsReceivableNetCurrent [2] 109,019,000us-gaap_AccountsReceivableNetCurrent [1],[2]
Other current assets 11,042,000us-gaap_OtherAssetsCurrent [3] 10,841,000us-gaap_OtherAssetsCurrent [1],[3]
Total current assets 214,984,000us-gaap_AssetsCurrent 187,073,000us-gaap_AssetsCurrent [1]
Note receivable - Anadarko 260,000,000us-gaap_NotesReceivableRelatedPartiesNoncurrent 260,000,000us-gaap_NotesReceivableRelatedPartiesNoncurrent [1]
Property, plant and equipment    
Cost 5,814,914,000us-gaap_PropertyPlantAndEquipmentGross 5,626,650,000us-gaap_PropertyPlantAndEquipmentGross [1]
Less accumulated depreciation 1,103,643,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 1,055,207,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment [1]
Net property, plant and equipment 4,711,271,000us-gaap_PropertyPlantAndEquipmentNet 4,571,443,000us-gaap_PropertyPlantAndEquipmentNet [1]
Goodwill 393,035,000us-gaap_Goodwill 389,087,000us-gaap_Goodwill [1]
Other intangible assets 853,449,000us-gaap_IntangibleAssetsNetExcludingGoodwill 884,857,000us-gaap_IntangibleAssetsNetExcludingGoodwill [1]
Equity investments 635,920,000us-gaap_EquityMethodInvestments 634,492,000us-gaap_EquityMethodInvestments [1]
Other assets 27,616,000us-gaap_OtherAssetsNoncurrent 28,289,000us-gaap_OtherAssetsNoncurrent [1]
Total assets 7,096,275,000us-gaap_Assets 6,955,241,000us-gaap_Assets [1]
Current liabilities    
Accounts and natural gas imbalance payables 51,015,000us-gaap_AccountsPayableTradeCurrent [4] 54,232,000us-gaap_AccountsPayableTradeCurrent [1],[4]
Accrued ad valorem taxes 19,725,000us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 14,812,000us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent [1]
Accrued liabilities 171,786,000us-gaap_AccruedLiabilitiesCurrent 170,864,000us-gaap_AccruedLiabilitiesCurrent [1]
Total current liabilities 242,526,000us-gaap_LiabilitiesCurrent 241,058,000us-gaap_LiabilitiesCurrent [1]
Long-term debt 2,532,995,000us-gaap_LongTermDebtNoncurrent 2,422,954,000us-gaap_LongTermDebtNoncurrent [1]
Deferred income taxes 7,802,000us-gaap_DeferredTaxLiabilitiesNoncurrent 45,656,000us-gaap_DeferredTaxLiabilitiesNoncurrent [1]
Asset retirement obligations and other 114,766,000us-gaap_AssetRetirementObligationsNoncurrent 111,714,000us-gaap_AssetRetirementObligationsNoncurrent [1]
Deferred purchase price obligation - Anadarko 175,696,000us-gaap_DueToRelatedPartiesNoncurrent [5] 0us-gaap_DueToRelatedPartiesNoncurrent [1],[5]
Total long-term liabilities 2,831,259,000us-gaap_LiabilitiesNoncurrent 2,580,324,000us-gaap_LiabilitiesNoncurrent [1]
Total liabilities 3,073,785,000us-gaap_Liabilities 2,821,382,000us-gaap_Liabilities [1]
Equity and partners' capital    
Common units (218,909,977 units issued and outstanding at March 31, 2015, and December 31, 2014) 1,252,921,000us-gaap_LimitedPartnersCapitalAccount 1,260,195,000us-gaap_LimitedPartnersCapitalAccount [1]
Net investment by Anadarko 0us-gaap_OtherPartnersCapital 122,509,000us-gaap_OtherPartnersCapital [1]
Total partners' capital 1,252,921,000us-gaap_PartnersCapital 1,382,704,000us-gaap_PartnersCapital [1]
Noncontrolling interests 2,769,569,000us-gaap_PartnersCapitalAttributableToNoncontrollingInterest 2,751,155,000us-gaap_PartnersCapitalAttributableToNoncontrollingInterest [1]
Total equity and partners' capital 4,022,490,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest 4,133,859,000us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest [1]
Total liabilities, equity and partners' capital 7,096,275,000us-gaap_LiabilitiesAndStockholdersEquity 6,955,241,000us-gaap_LiabilitiesAndStockholdersEquity [1]
Anadarko [Member]    
Current liabilities    
WGP working capital facility - Anadarko $ 0us-gaap_ShortTermBorrowings
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wgp_AnadarkoMember		 $ 1,150,000us-gaap_ShortTermBorrowings
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= wgp_AnadarkoMember		 [1]
[1] Financial information has been recast to include the financial position and results attributable to the DBJV system. See Note 1 and Note 2.
[2] Accounts receivable, net includes amounts receivable from affiliates (as defined in Note 1) of $38.8 million and $64.5 million as of March 31, 2015, and December 31, 2014, respectively.
[3] Other current assets includes natural gas imbalance receivables from affiliates of zero and $0.2 million as of March 31, 2015, and December 31, 2014, respectively.
[4] Accounts and natural gas imbalance payables includes amounts payable to affiliates of zero and $0.1 million as of March 31, 2015, and December 31, 2014, respectively.
[5] See Note 2.