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Represents the actual ratio of consolidated funded debt to consolidated EBITDA (Earnings before interest, taxes, depreciation, depletion and amortization) as of the reporting period date.

No definition available.

Name:	bpl_DebtInstrumentCovenantsActualFundedDebtRatio
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Represents the maximum ratio of consolidated funded debt to consolidated EBITDA (Earnings before interest, taxes, depreciation, depletion and amortization) as defined in the debt instrument covenants.

No definition available.

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Represents the maximum ratio of consolidated funded debt to consolidated EBITDA (Earnings before interest, taxes, depreciation, depletion and amortization) subject to certain future acquisitions, as defined in the debt instrument covenants.

No definition available.

Name:	bpl_DebtInstrumentCovenantsMaximumFundedDebtRatioSubjectToFutureAcquisitions
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Represents the period of extension term for debt instrument.

No definition available.

Name:	bpl_DebtInstrumentExtensionTerm
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Represents the issuance price of debt stated as a percentage of par.

No definition available.

Name:	bpl_DebtInstrumentIssuancePriceAsPercentageOfPar
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Period Type:	duration

Debt Instrument, Number of Extension Periods

No definition available.

Name:	bpl_DebtInstrumentNumberofExtensionPeriods
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Represents the period under each successive extension term for debt instrument.

No definition available.

Name:	bpl_DebtInstrumentPeriodUnderEachExtensionTerm
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Period Type:	duration

Option to increase the maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount which could be borrowed or the amounts currently outstanding under the facility.

No definition available.

Name:	bpl_LineOfCreditFacilityAccordionOption
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Balance Type:	credit
Period Type:	instant

The cash outflow for derivative instruments during the period, which are classified as operating activities, excluding those designated as hedging instruments.

No definition available.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

No definition available.

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Period Type:	duration

Weighted average interest rate of debt outstanding.

No definition available.

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Period Type:	instant

Gross amount of debt extinguished.

No definition available.

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The amount of cash paid for interest during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

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Balance Type:	credit
Period Type:	instant

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
-Paragraph 1
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Name:	us-gaap_PaymentsOfDebtIssuanceCosts
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

No definition available.

Name:	us-gaap_ProceedsFromDebtNetOfIssuanceCosts
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

Name:	us-gaap_UnamortizedDebtIssuanceExpense
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Name:	us-gaap_DebtInstrumentAxis=bpl_CreditFacilityMember
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Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
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Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
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