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Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Adoption of Accounting Policies (Details) - USD ($) $ in Millions	May 31, 2020	Mar. 01, 2020	Feb. 29, 2020	May 31, 2019	Feb. 28, 2019
New Accounting Pronouncement, Early Adoption [Line Items]
Stockholders' Equity Attributable to Parent	$ (1,913)		$ (2,529)	$ (2,597)	$ (2,636)
Accounts Receivable, Allowance for Credit Loss	$ 13	$ 13	9
Cumulative Effect, Period of Adoption, Adjustment \| Accounting Standards Update 2016-13
New Accounting Pronouncement, Early Adoption [Line Items]
Stockholders' Equity Attributable to Parent			$ 4

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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