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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 14, 2014
Related party transaction
Costs reimbursed to general partner	$ 598us-gaap_PaymentForAdministrativeFees	$ 567us-gaap_PaymentForAdministrativeFees	$ 535us-gaap_PaymentForAdministrativeFees
Proceeds from sales of assets	28us-gaap_ProceedsFromSaleOfProductiveAssets	200us-gaap_ProceedsFromSaleOfProductiveAssets	22us-gaap_ProceedsFromSaleOfProductiveAssets
BridgeTex Pipeline Company, LLC
Related party transaction
Interest acquired (as a percent)	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = paa_BridgeTexPipelineCompanyLLCMember			50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = paa_BridgeTexPipelineCompanyLLCMember
Oxy
Related party transaction
Related party ownership of general partner interest (as a percent)	13.20%paa_RelatedPartyOwnershipInterestInGeneralPartnerPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = paa_OxyMember
Revenues	1,212us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = paa_OxyMember	1,309us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = paa_OxyMember	1,636us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = paa_OxyMember
Purchases and related costs	925us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = paa_OxyMember	863us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = paa_OxyMember	557us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = paa_OxyMember
Trade accounts receivable and other receivables, gross	489us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = paa_OxyMember	133us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = paa_OxyMember
Accounts payable, gross	441us-gaap_DueToRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = paa_OxyMember	181us-gaap_DueToRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = paa_OxyMember
Oxy | BridgeTex Pipeline Company, LLC
Related party transaction
Interest acquired (as a percent)				50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = paa_OxyMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = paa_BridgeTexPipelineCompanyLLCMember
Equity Method Investees
Related party transaction
Revenues	3us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember	33us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember	18us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember
Purchases and related costs	75us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember	79us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember	42us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember
Trade accounts receivable and other receivables, gross		2us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember
Accounts payable, gross	6us-gaap_DueToRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember	6us-gaap_DueToRelatedPartiesCurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember
Equity Method Investees | Maximum
Related party transaction
Trade accounts receivable and other receivables, gross	1us-gaap_DueFromRelatedPartiesCurrent / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember
Eagle Ford Pipeline LLC
Related party transaction
Proceeds from sales of assets	$ 25us-gaap_ProceedsFromSaleOfProductiveAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = paa_EagleFordPipelineLLCMember

X

- Definition

The percentage of ownership interest of related parties in the general partner of the entity.

+ References

No definition available.

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The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).

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- Definition

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

+ References

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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- Definition

Amount paid to managing member or general partner, affiliate of managing member or general partner, or affiliate of limited liability company (LLC) or limited partnership (LP) for administrative services provided to the LLC or LP, for example, but not limited to, salaries, rent, or overhead costs.

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- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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