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Debentures - Change in Fair Value (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Nov. 30, 2021 | Nov. 30, 2020 | Nov. 30, 2021 | Nov. 30, 2020
Debt Instrument [Line Items] |  |  |  |
Debenture, Fair Value, beginning balance |  |  | $ 720 |
Debenture, Fair Value, ending balance | $ 673 |  | 673 |
1.75% Debenture |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debenture, Fair Value, beginning balance |  |  | 720 |
Debenture total fair value adjustment | (109) | $ 94 | (47) | $ 94
Debenture, Fair Value, ending balance | 673 |  | 673 |
3.75% Debenture |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debenture total fair value adjustment | $ 0 | $ 0 | $ 0 | $ 4

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- Definition Debenture total fair value adjustment + References No definition available. + Details
Name: | bbry_Debenturetotalfairvalueadjustment
Namespace Prefix: | bbry_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

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- 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

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

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