REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 27,914	$ 25,813	$ 26,415
Various Customer Relationships
Disaggregation of Revenue [Line Items]
Increased contract assets	206	232
Point in time
Disaggregation of Revenue [Line Items]
Net sales	19,011	20,081	24,517
Over time
Disaggregation of Revenue [Line Items]
Net sales	8,903	5,732	1,898
Operating segments
Disaggregation of Revenue [Line Items]
Net sales	27,914	25,813	26,415
ITS \| Operating segments
Disaggregation of Revenue [Line Items]
Net sales	11,109	11,336	12,636
ITS \| Operating segments \| Point in time
Disaggregation of Revenue [Line Items]
Net sales	6,984	8,479	11,535
ITS \| Operating segments \| Over time
Disaggregation of Revenue [Line Items]
Net sales	4,125	2,857	1,101
RMS \| Operating segments
Disaggregation of Revenue [Line Items]
Net sales	10,191	9,678	10,535
RMS \| Operating segments \| Point in time
Disaggregation of Revenue [Line Items]
Net sales	5,867	6,914	9,749
RMS \| Operating segments \| Over time
Disaggregation of Revenue [Line Items]
Net sales	4,324	2,764	786
CPI \| Operating segments
Disaggregation of Revenue [Line Items]
Net sales	6,614	4,799	3,244
CPI \| Operating segments \| Point in time
Disaggregation of Revenue [Line Items]
Net sales	6,160	4,688	3,233
CPI \| Operating segments \| Over time
Disaggregation of Revenue [Line Items]
Net sales	$ 454	$ 111	$ 11