Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Stock-based Compensation (Details) - shares	12 Months Ended
	Feb. 28, 2022	Feb. 21, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of common shares authorized under the Equity Plan (in shares)	45,875,000
Shares issued as options (in shares) impact to Equity Plan	0.625
Options forfeited (in shares) impact to Equity Plan	0.625
RSUs, forfeited, settled in cash or sold to cover withholding tax requirements, counted as (in shares) impact to Equity Plan	1
BlackBerry-Cylance Plan - Authorized Number of shares		9,144,176
Shares in the equity pool available for future grants	19,000,000
TBRSU Share Limit	1
PBRSU Share Limit	1.5