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Debt (Receivables-Related Borrowings) (Details) - USD ($) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2016 | Mar. 31, 2016 | Apr. 15, 2016 | Dec. 31, 2015
Receivables facility |  | $ 300.0 |  | $ 350.0
Receivables Facility [Member] |  |  |  |
Maximum borrowing capacity |  | $ 400.0 |  |
Debt Instrument, Maturity Date |  | Aug. 01, 2016 |  |
Accounts receivable as collateral for receivables facility |  | $ 796.0 |  |
Receivables facility |  | $ 300.0 |  |
JardenReceiablesFacility [Member] |  |  |  |
Receivables facility |  |  | $ 500.0 |
JardenReceiablesFacility [Member] |  |  |  |
Debt Instrument, Maturity Date | Oct. 01, 2016 |  |  |

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- Definition Secured financing facility where underlying trade receivables are not accounted for as "sale" under ASC 860 with initial maturity date of the financing facility being 364 days. + References No definition available. + Details
Name: | nwl_ReceivablesFacility
Namespace Prefix: | nwl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Receivables Facility, Collateral At Period End, Value + References No definition available. + Details
Name: | nwl_ReceivablesFacilityCollateralAtPeriodEndValue
Namespace Prefix: | nwl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Maximum borrowing capacity under the receivables financing facility without consideration of the amounts currently outstanding under the facility. + References No definition available. + Details
Name: | nwl_ReceivablesFinancingFacilityMaximumBorrowingCapacity
Namespace Prefix: | nwl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=nwl_ReceivablesFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=nwl_JardenReceiablesFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=nwl_JardenReceiablesFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |