Revenue and Segment Disclosures - Operating results by operating segments (Details) $ in Millions	3 Months Ended		9 Months Ended
	Nov. 30, 2024 USD ($)	Nov. 30, 2023 USD ($)	Nov. 30, 2024 USD ($) operatingSegment	Nov. 30, 2023 USD ($)
Segment Reporting [Abstract]
Number of Operating Segments | operatingSegment			3
Segment Reporting Information [Line Items]
Revenues	$ 143	$ 152	$ 391	$ 606
Cost of sales	31	33	102	239
Segment gross margin	112	119	289	367
Research and development	27	29	85	98
Selling and Marketing Expense	23	25	68	77
General and Administrative Expense	38	45	111	133
IoT
Segment Reporting Information [Line Items]
Revenues	62	55	170	149
Cost of sales	9	8	28	24
Segment gross margin				125
Segment gross margin	53	47	142
Research and development	16	15	47	49
Selling and Marketing Expense	11	10	32	31
General and Administrative Expense	9	10	25	32
Less amortization included in segment	1	0	2	2
Segment Earnings before interest, taxes, depreciation and amortization	18	12	40	15
Licensing
Segment Reporting Information [Line Items]
Revenues	7	6	16	245
Cost of sales	2	1	5	150
Segment gross margin			11
Segment gross margin	5	5		95
Research and development	0	0	0	0
Selling and Marketing Expense	0	0	0	0
General and Administrative Expense	1	6	5	19
Less amortization included in segment	2	3	6	8
Segment Earnings before interest, taxes, depreciation and amortization	6	2	12	84
Secure Communication
Segment Reporting Information [Line Items]
Revenues	74	91	205	212
Cost of sales	20	23	67	62
Segment gross margin	54	68	138	150
Research and development	11	12	36	44
Selling and Marketing Expense	12	15	34	45
General and Administrative Expense	10	9	30	35
Less amortization included in segment	1	1	3	4
Segment Earnings before interest, taxes, depreciation and amortization	22	33	41	30
Total Operating Segments
Segment Reporting Information [Line Items]
Revenues	143	152	391	606
Cost of sales	31	32	100	236
Segment gross margin	112	120	291	370
Research and development	27	27	83	93
Selling and Marketing Expense	23	25	66	76
General and Administrative Expense	20	25	60	86
Less amortization included in segment	4	4	11	14
Segment Earnings before interest, taxes, depreciation and amortization	$ 46	$ 47	$ 93	$ 129