| Cover | Sep. 22, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 22, 2021 |
| Entity Registrant Name | BlackBerry Limited |
| Entity Incorporation, State or Country Code | Z4 |
| Entity File Number | 001-38232 |
| Entity Tax Identification Number | 98-0164408 |
| Entity Address, Address Line One | 2200 University Ave East |
| Entity Address, City or Town | Waterloo |
| Entity Address, State or Province | ON |
| Entity Address, Country | CA |
| Entity Address, Postal Zip Code | N2K 0A7 |
| City Area Code | 519 |
| Local Phone Number | 888-7465 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001070235 |
| Amendment Flag | false |
| NEW YORK STOCK EXCHANGE, INC. [Member] | |
| Document Information [Line Items] | |
| Title of 12(g) Security | Common Shares |
| Trading Symbol | BB |
| Security Exchange Name | NYSE |
