| Cover | Mar. 28, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 28, 2023 |
| Entity Registrant Name | LEONARDO DRS, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-41565 |
| Entity Tax Identification Number | 13-2632319 |
| Entity Address, Address Line One | 2345 Crystal Drive |
| Entity Address, Address Line Two | Suite 1000 |
| Entity Address, City or Town | Arlington |
| Entity Address, State or Province | VA |
| Entity Address, Postal Zip Code | 22202 |
| City Area Code | 703 |
| Local Phone Number | 416-8000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001833756 |
