| Document and Entity Information | Feb. 24, 2021 |
| Document And Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 24, 2021 |
| Entity Registrant Name | LSC Communications, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-37729 |
| Entity Tax Identification Number | 36-4829580 |
| Entity Address, Address Line One | P.O. Box 329003 |
| Entity Address, City or Town | Brooklyn |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 11232 |
| City Area Code | 773 |
| Local Phone Number | 272-9200 |
| 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 | 0001669812 |
| Former Address [Member] | |
| Document And Entity Information [Line Items] | |
| Entity Address, Address Line One | 4101 Winfield Road |
| Entity Address, City or Town | Warrenville |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60555 |
