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Leases - Schedule of Consolidated Balance Sheet Related To Leases (Non-Printing) (Detail) $ in Millions	Sep. 30, 2019 USD ($)
Leases [Abstract]
Net of accumulated amortization	$ 7.3

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- Definition

Accumulated Depreciation, Depletion And Amortization, Property, Plant And Equipment, Finance Leases

+ References

No definition available.

+ Details

Name:	nwl_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentFinanceLeases
Namespace Prefix:	nwl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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