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v3.20.2

Segment Information - Additional Information (Detail) - segment | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2020 | Sep. 30, 2020
Segment Reporting [Abstract] |  |
Number of separate operating segments (in segments) | 2 |
Number of primary reportable segments (in segments) |  | 5

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- Definition Number Of Separate Operating Segments + References No definition available. + Details
Name: | nwl_NumberOfSeparateOperatingSegments
Namespace Prefix: | nwl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration