Debenture implied discount

No definition available.

Name:	bbry_DebentureImpliedDiscount
Namespace Prefix:	bbry_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Unpaid Principal Balance

+ References

No definition available.

+ Details

Name:	bbry_DebtInstrumentUnpaidPrincipalBalance
Namespace Prefix:	bbry_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair Value Inputs for Debenture - Entity Credit Risk

+ References

No definition available.

+ Details

Name:	bbry_FairValueInputsForDebentureEntityCreditRisk
Namespace Prefix:	bbry_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Related Party Principal Amounts of 1.75% Debenture Owned

+ References

No definition available.

+ Details

Name:	bbry_RelatedPartyPrincipalAmountsOf175DebentureOwned
Namespace Prefix:	bbry_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Related Party Principal Amounts of 3.75% Debenture Owned

+ References

No definition available.

+ Details

Name:	bbry_RelatedPartyPrincipalAmountsof3.75DebentureOwned
Namespace Prefix:	bbry_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Date the debt instrument was repurchased, in YYYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of long-term debt instruments that have contractual principal amounts and for which the fair value option has been elected.

+ References

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+ Details

Name:	us-gaap_FairValueOptionAggregateDifferencesLongTermDebtInstruments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

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+ Details

Name:	us-gaap_InterestExpenseDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=bbry_A3.75DebentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=bbry_A175DebentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debentures (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
Debentures (Details) - USD ($) $ in Millions	May 31, 2021	May 31, 2020	Feb. 28, 2021	Sep. 01, 2020
Debt Instrument [Line Items]
Long-term debentures (note 6)	$ 715		$ 720
3.75% Debenture
Debt Instrument [Line Items]
Face amount of debt				$ 605
Interest expense, debt		$ 6
Related party principal amounts of 3.75% debenture owned				500
Debt Instrument, Repurchase Amount				$ 615
Debt Instrument, Repurchase Date			Sep. 01, 2020
1.75% Debenture
Debt Instrument [Line Items]
Face amount of debt	365
Unpaid principal balance	365
Fair Value, Option, Aggregate Differences, Long-term Debt Instruments	(350)
Interest expense, debt	2
Related Party Principal Amounts of 1.75% Debenture Owned	$ 330
Fair Value Inputs, Entity Credit Risk	6.50%			7.90%
Long-term debentures (note 6)	$ 715		$ 720	$ 456
Debenture implied discount				$ 91