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Commitments and Contingencies - Narrative (Details)	9 Months Ended
	Sep. 30, 2025
Minimum
Product Warranty Liability [Line Items]
Product warranty term	1 year
Maximum
Product Warranty Liability [Line Items]
Product warranty term	3 years

X

- Definition

Standard Product Warranty, Term

+ References

No definition available.

+ Details

Name:	drs_StandardProductWarrantyTerm
Namespace Prefix:	drs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

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

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: