Blackberry Limited and Summary of Significant Accounting Policies and Critical Accounting Estimates - Adoption of Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Nov. 30, 2023	Nov. 30, 2023
Reclassification [Line Items]
Cost of sales	$ 48	$ 289
Facilities Reclass - Gross Margin Previously Reported	127	391
Facilities Reclass - Research and Development Previously Reported	42	146
Facilities Reclass - Sales and Marketing Previously Reported	42	131
Facilities Reclass - General and administrative Previously Reported	43	127
Facilities Reclass - Cybersecurity Segment COS Previously Reported	37	110
Facilities Reclass - Cybersecurity Segment GM Previously Reported	77	176
Facilities Reclass - IoT Segment COS Previously Reported	9	26
Facilities Reclass - IoT Segment GM Previously Reported	46	123
Facilities reclass - impact to cost of sales	(2)	(6)
Facilities reclass - impact to Gross Margin	2	6
Facilities reclass - impact to Research and development	(3)	(10)
Facilities reclass - impact to Sales and marketing	(2)	(7)
Facilities reclass - impact to General and administrative	7	23
Facilities reclass - impact to Cybersecurity Segment cost of sales	(1)	(4)
Facilities reclass - impact to Cybersecurity Segment gross margin	1	4
Facilities reclass - impact to IoT Segment cost of sales	(1)	(2)
Facilities reclass - impact to IoT Segment gross margin	1	2
Facilities Reclass - Cost of Sales Revised	46	283
Facilities Reclass - Gross Margin Revised	129	397
Facilities Reclass - Research and Development Revised	39	136
Facilities Reclass - Sales and Marketing Revised	40	124
Facilities Reclass - General and administrative Revised	50	150
Facilities Reclass - Cybersecurity Segment COS Revised	36	106
Facilities Reclass - Cybersecurity Segment GM Revised	78	180
Facilities Reclass - IoT Segment COS Revised	8	24
Facilities Reclass - IoT Segment GM Revised	$ 47	$ 125