Aggregate Principal Amount Of Notes Issued By Affiliates To Related Party Other

No definition available.

Name:	nlsnnv_AggregatePrincipalAmountOfNotesIssuedByAffiliatesToRelatedPartyOtherThanReportingEntity
Namespace Prefix:	nlsnnv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Aggregate principal amount of senior secured notes.

+ References

No definition available.

+ Details

Name:	nlsnnv_AggregatePrincipalAmountOfSeniorSecuredNotes
Namespace Prefix:	nlsnnv_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Amended debt instrument principal amount.

+ References

No definition available.

+ Details

Name:	nlsnnv_AmendedDebtInstrumentPrincipalAmount
Namespace Prefix:	nlsnnv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Base rate added to applicable margin of borrowings.

+ References

No definition available.

+ Details

Name:	nlsnnv_BaseRateAddedToApplicableMarginOfBorrowings
Namespace Prefix:	nlsnnv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Credit facility agreement term.

+ References

No definition available.

+ Details

Name:	nlsnnv_CreditFacilityAgreementTerm
Namespace Prefix:	nlsnnv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Credit facility available borrowing line.

+ References

No definition available.

+ Details

Name:	nlsnnv_CreditFacilityAvailableBorrowingLine
Namespace Prefix:	nlsnnv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Current applicable margins.

+ References

No definition available.

+ Details

Name:	nlsnnv_CurrentApplicableMargins
Namespace Prefix:	nlsnnv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument issuance as percentage of par value.

+ References

No definition available.

+ Details

Name:	nlsnnv_DebtInstrumentIssuanceAsPercentageOfParValue
Namespace Prefix:	nlsnnv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt instrument maturity year.

+ References

No definition available.

+ Details

Name:	nlsnnv_DebtInstrumentMaturityYear
Namespace Prefix:	nlsnnv_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument quarterly principal repayment percentage.

+ References

No definition available.

+ Details

Name:	nlsnnv_DebtInstrumentQuarterlyPrincipalRepaymentPercentage
Namespace Prefix:	nlsnnv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective interest rate on capital leases and other financing transactions.

+ References

No definition available.

+ Details

Name:	nlsnnv_EffectiveInterestRateOnCapitalLeasesAndOtherFinancingTransactions
Namespace Prefix:	nlsnnv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Long term borrowings maturity period.

+ References

No definition available.

+ Details

Name:	nlsnnv_LongTermBorrowingsMaturityPeriod
Namespace Prefix:	nlsnnv_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Long term debt repayments of principal in next twelve months percentage.

+ References

No definition available.

+ Details

Name:	nlsnnv_LongTermDebtRepaymentsOfPrincipalInNextTwelveMonthsPercentage
Namespace Prefix:	nlsnnv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Long term debt repayments of principal in year five percentage.

+ References

No definition available.

+ Details

Name:	nlsnnv_LongTermDebtRepaymentsOfPrincipalInYearFivePercentage
Namespace Prefix:	nlsnnv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Long term debt repayments of principal in year four percentage.

+ References

No definition available.

+ Details

Name:	nlsnnv_LongTermDebtRepaymentsOfPrincipalInYearFourPercentage
Namespace Prefix:	nlsnnv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Long term debt repayments of principal in year three percentage.

+ References

No definition available.

+ Details

Name:	nlsnnv_LongTermDebtRepaymentsOfPrincipalInYearThreePercentage
Namespace Prefix:	nlsnnv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Long term debt repayments of principal in year two percentage.

+ References

No definition available.

+ Details

Name:	nlsnnv_LongTermDebtRepaymentsOfPrincipalInYearTwoPercentage
Namespace Prefix:	nlsnnv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Margin added to LIBOR for determining interest rate.

+ References

No definition available.

+ Details

Name:	nlsnnv_MarginAddedToLiborForDeterminingInterestRate
Namespace Prefix:	nlsnnv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Outstanding borrowings.

+ References

No definition available.

+ Details

Name:	nlsnnv_OutstandingBorrowings
Namespace Prefix:	nlsnnv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of capital stock in foreign subsidiaries.

+ References

No definition available.

+ Details

Name:	nlsnnv_PercentageOfCapitalStockInForeignSubsidiaries
Namespace Prefix:	nlsnnv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Redemption rate of senior notes equal to principal amount plus accrued and unpaid interest.

+ References

No definition available.

+ Details

Name:	nlsnnv_RedemptionRateOfSeniorNotesEqualToPrincipalAmountPlusAccruedAndUnpaidInterest
Namespace Prefix:	nlsnnv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e)(3)(ii))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

+ Details

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

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of minimum sublease rentals for sale-leaseback transactions accounted for using the deposit method or as a financing to be received by the seller-lessee in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6456377&loc=d3e50824-112756

+ Details

Name:	us-gaap_FutureMinimumSubleaseRentalsSaleLeasebackTransactionsWithinOneYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount, during the lease term, of each minimum [capital] lease payment allocated to interest expense so as to produce a constant periodic rate of interest on the remaining balance of the capital lease obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 35
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6916424&loc=d3e43161-112731

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_InterestExpenseLesseeAssetsUnderCapitalLease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest expense incurred on a debt or other obligation to related party.

+ References

No definition available.

+ Details

Name:	us-gaap_InterestExpenseRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

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

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

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

+ Details

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

- Definition

Total long-term debt at the balance sheet date before fresh-start adjustments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56426-112766

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6918054&loc=SL2890621-112765

+ Details

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

- Definition

Amount of prepaid and other current assets at the balance sheet date before fresh-start adjustments.

+ References

+ Details

Name:	us-gaap_PreconfirmationPrepaidAndOtherCurrentAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_WriteOffOfDeferredDebtIssuanceCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=nlsnnv_SeniorSecuredNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=nlsnnv_DebentureLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=nlsnnv_SeniorDebentureLoanDueTwoThousandAndTwentyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=nlsnnv_SeniorDebentureLoanDueTwoThousandAndTwentyOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=nlsnnv_SeniorDebentureLoanDueTwoThousandAndFourteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=nlsnnv_ClassATermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=nlsnnv_ClassBOneTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=nlsnnv_BaseRateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=nlsnnv_EuroCurrencyRateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=nlsnnv_ClassBTwoTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlsnnv_ClassETermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=nlsnnv_ClassBTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=nlsnnv_ClassCTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlsnnv_NewClassesTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlsnnv_ClassDTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nlsnnv_SeniorDebentureLoanDueTwoThousandAndTwentyTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=nlsnnv_SeniorSecuredCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=nlsnnv_SeniorDebentureLoanDueTwoThousandAndEighteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=nlsnnv_SevenPointSevenFivePercentageSeniorNotesDueTwoThousandEighteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=nlsnnv_NewRevolvingLineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-term Debt and Other Financing Arrangements - Additional Information (Detail) € in Millions				1 Months Ended					3 Months Ended	12 Months Ended
	Feb. 28, 2015 USD ($)	Jul. 31, 2014 USD ($)	Apr. 30, 2014 USD ($)	May. 31, 2014 USD ($)	Sep. 30, 2013 USD ($)	Feb. 28, 2013 USD ($)	Feb. 29, 2012 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	May. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 EUR (€)	Apr. 30, 2014 EUR (€)	Feb. 28, 2013 EUR (€)
Debt Instrument [Line Items]
Reclassification current assets										$ 8,000,000
Reclassification of non-current assets to short -term and long-term debt obligations										42,000,000
Senior Secured Credit Agreement amortizing term, amended							5 years
Senior secured credit agreement amended, principal amount							$ 1,222,000,000
Payment to redeem outstanding senior notes										98,000,000	$ 4,598,000,000		$ 2,171,000,000
Redemption price percentage of principal amount redeemed		100.00%		100.00%
Gain (Loss) on Extinguishment of Debt											(51,000,000)
Net restricted assets, subsidiary entities										$ 5,200,000,000
Capital stock of non-U.S. subsidiaries of the company, percentage										65.00%
Letters of credit, outstanding										$ 7,000,000	6,000,000
Proceeds from issuances of debt, net of issuance costs										746,000,000	4,544,000,000		2,485,000,000
Issue of Notes to Related Parties											222,000,000
Interest expense associated with amounts held by former Sponsors											6,000,000		12,000,000
Interest expense related to capital leases and other financing transactions										8,000,000	$ 8,000,000		$ 9,000,000
Proceeds to be received under non-cancelable subleases										$ 3,000,000
Senior Secured Notes
Debt Instrument [Line Items]
Debt instrument face value			$ 750,000,000
Debt instrument interest rate stated percentage			5.00%												5.00%
Debenture loans
Debt Instrument [Line Items]
Redemption of Senior notes and Senior subordinated discount notes at a percentage of aggregated accreted principal plus accrued and unpaid interest										101.00%
Senior Debenture Loan Due 2022
Debt Instrument [Line Items]
Debt instrument face value		$ 800,000,000	$ 750,000,000
Debt instrument interest rate stated percentage		5.00%	5.00%												5.00%
Debt instrument, maturity year			2022							2022
Senior debenture loan due 2021
Debt Instrument [Line Items]
Debt instrument face value					$ 625,000,000
Debt instrument interest rate stated percentage					5.50%
Debt instrument, maturity year					2021
Proceeds from issuances of debt, net of issuance costs					$ 616,000,000
Debt Instrument Issuance As Percentage Of Par Value					100.00%
Senior debenture loan due 2014
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage					11.625%
Gain (Loss) on Extinguishment of Debt									$ (8,000,000)
Debt instrument, maturity year					2014
Class A Term Loans
Debt Instrument [Line Items]
Original principal amount paid in first year										5.00%
Original principal amount paid in second year										5.00%
Original principal amount paid in third year										7.50%
Original principal amount paid in fourth year										10.00%
Original principal amount paid in fifth year										72.50%
Original principal amount repaid										3.75%
Debt instrument face value										$ 1,580,000,000
Convertible Subordinated Bonds, Maturity date										Apr. 01, 2019
Class B-1 Term Loans
Debt Instrument [Line Items]
Original principal amount repaid										1.00%
Debt instrument face value										$ 500,000,000
Convertible Subordinated Bonds, Maturity date										May 01, 2017
Class B-1 Term Loans \| Base Rate Loans
Debt Instrument [Line Items]
Margin under term loan facility										1.25%
Class B-1 Term Loans \| Eurocurrency Rate Loans
Debt Instrument [Line Items]
Margin under term loan facility										2.25%
Class B-2 Term Loans
Debt Instrument [Line Items]
Original principal amount repaid										1.00%
Debt instrument face value										$ 1,100,000,000				€ 286
Convertible Subordinated Bonds, Maturity date										Apr. 01, 2021
Class B-2 Term Loans \| Base Rate Loans
Debt Instrument [Line Items]
Margin under term loan facility										2.00%
Applicable margin for senior secured term loans, base rate loans										3.00%
Class B-2 Term Loans \| Eurocurrency Rate Loans
Debt Instrument [Line Items]
Margin under term loan facility										3.00%
Class E Term Loans
Debt Instrument [Line Items]
Senior secured credit agreement amended, principal amount						$ 2,532,000,000										€ 289
Convertible Subordinated Bonds, Maturity date											May 01, 2016
Class E Term Loans \| Class A Term Loans
Debt Instrument [Line Items]
Debt instrument, maturity date						Aug. 09, 2013
Class E Term Loans \| Class B Term Loans
Debt Instrument [Line Items]
Debt instrument, maturity date						May 01, 2016
Class E Term Loans \| Class C Term Loans
Debt Instrument [Line Items]
Debt instrument, maturity date						May 01, 2016
New Classes Term Loan
Debt Instrument [Line Items]
Senior secured credit agreement amended, principal amount			$ 3,180,000,000												€ 286
Class D Term Loans
Debt Instrument [Line Items]
Convertible Subordinated Bonds, Maturity date											Feb. 01, 2017
Senior Debenture Loan Due 2022
Debt Instrument [Line Items]
Debt instrument face value	$ 750,000,000	$ 800,000,000	$ 750,000,000							$ 2,300,000,000	$ 1,550,000,000
Debt instrument interest rate stated percentage	5.00%	5.00%	5.00%							5.00%	5.00%			5.00%	5.00%
Debt instrument, maturity year	2022	2022	2022							2022	2022
Minimum
Debt Instrument [Line Items]
Margin on LIBOR loans							1.75%
Effective interest rates on capital Leases and other financing activities										8.00%
Minimum \| Class A Term Loans \| Base Rate Loans
Debt Instrument [Line Items]
Margin under term loan facility										0.50%
Minimum \| Class A Term Loans \| Eurocurrency Rate Loans
Debt Instrument [Line Items]
Margin under term loan facility										1.50%
Maximum
Debt Instrument [Line Items]
Margin on LIBOR loans							2.50%
Effective interest rates on capital Leases and other financing activities										10.00%
Maximum \| Class A Term Loans \| Base Rate Loans
Debt Instrument [Line Items]
Margin under term loan facility										1.25%
Maximum \| Class A Term Loans \| Eurocurrency Rate Loans
Debt Instrument [Line Items]
Margin under term loan facility										2.25%
Senior Secured Credit Agreement
Debt Instrument [Line Items]
Debt instrument, maturity year											2017-02
Principal amount of notes issued							$ 750,000,000
Original principal amount paid in first year							5.00%
Original principal amount paid in second year							5.00%
Original principal amount paid in third year							10.00%
Original principal amount paid in fourth year							10.00%
Original principal amount paid in fifth year							70.00%
Original principal amount repaid							3.33%
Senior Secured Credit Agreement \| Class E Term Loans
Debt Instrument [Line Items]
Write off of previously capitalized debt financing fees						$ 12,000,000
Senior Debenture Loan Due 2018
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt											$ (45,000,000)
7.75% Senior Notes Due 2018
Debt Instrument [Line Items]
Debt instrument face value				$ 1,080,000,000								$ 1,080,000,000
Debt instrument interest rate stated percentage		7.75%		7.75%								7.75%
Payment to redeem outstanding senior notes		$ 800,000,000		$ 280,000,000								$ 280,000,000
Gain (Loss) on Extinguishment of Debt											(45,000,000)
Debt instrument, maturity year										2018
Revolving credit commitments
Debt Instrument [Line Items]
Debt instrument, maturity date				Apr. 30, 2016				Aug. 31, 2012
Debt instrument, maximum borrowing capacity				$ 635,000,000				$ 688,000,000				635,000,000
Borrowings, outstanding										$ 164,000,000	280,000,000
Letters of credit, outstanding										7,000,000	$ 6,000,000
Debt instrument, remaining borrowing capacity										$ 404,000,000
New revolving credit commitments
Debt Instrument [Line Items]
Debt instrument, maturity date				Apr. 30, 2019				Apr. 30, 2016
Debt instrument, maximum borrowing capacity				$ 575,000,000				$ 635,000,000				$ 575,000,000
Base Rate \| Minimum
Debt Instrument [Line Items]
Margin under term loan facility							0.75%
Base Rate \| Maximum
Debt Instrument [Line Items]
Margin under term loan facility							1.50%