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Segment Information - Schedule of Geographic Area Information (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Walmart Inc. and Subsidiaries [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of sales by major customer | 13.70% | 13.50% | 10.90%

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- Definition Percentage of sales by major customer + References No definition available. + Details
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Namespace Prefix: | nwl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_StatementGeographicalAxis=nwl_WalmartIncAndSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |