Derivative settlement receivables

No definition available.

Name:	cik0000919465_DerivativeSettlementReceivables
Namespace Prefix:	cik0000919465_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Derivative Term Of Fixed Interest Rate

+ References

No definition available.

+ Details

Name:	cik0000919465_DerivativeTermOfFixedInterestRate
Namespace Prefix:	cik0000919465_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of investments exceeding book value

+ References

No definition available.

+ Details

Name:	cik0000919465_FairValueOfInvestmentsExceedingBookValue
Namespace Prefix:	cik0000919465_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeInceptionDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeMaturityDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DerivativeByNatureAxis=cik0000919465_TwoThousandThirteenInterestRateSwapMember
Namespace Prefix:
Data Type:	na
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- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

- Details

Name:	us-gaap_DerivativeByNatureAxis=cik0000919465_TwoThousandFifteenInterestRateSwapMember
Namespace Prefix:
Data Type:	na
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Financial Instruments And Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Jun. 28, 2013	Jul. 02, 2016	Sep. 30, 2015	Mar. 31, 2014	Feb. 28, 2013
Derivative [Line Items]
Fair value of investments exceeding book value		$ 75
2013 Swaps [Member]
Derivative [Line Items]
Debt instrument, face amount					$ 1,000
Derivative variable interest rate					1.00%
Derivative settlement receivables	$ 16
Term of fixed interest rate		3 years
Derivative instrument fixed interest rate					2.355%
Derivative effective date		May 01, 2016
2014 Swaps [Member]
Derivative [Line Items]
Debt instrument, face amount				$ 1,000
Derivative variable interest rate		1.00%
Term of fixed interest rate		3 years
Derivative instrument fixed interest rate		2.59%
Derivative effective date		Feb. 01, 2016
Derivative maturity date		Feb. 01, 2019
2015 Swap [Member]
Derivative [Line Items]
Debt instrument, face amount			$ 1,000
Derivative variable interest rate		1.00%
Term of fixed interest rate		1 year
Derivative instrument fixed interest rate		1.7185%
Derivative effective date		Dec. 01, 2015
Derivative maturity date		Jun. 01, 2019