WORKFORCE REBALANCING AND SITE-RATIONALIZATION CHARGES - Classification of restructuring activity (Details) - USD ($) $ in Millions	12 Months Ended			24 Months Ended	36 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2026	Mar. 31, 2026
RESTRUCTURING
Charges	$ 60	$ 162	$ 174
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of Revenue, Selling, General and Administrative Expense, Workforce Rebalancing Costs	Cost of Revenue, Selling, General and Administrative Expense, Workforce Rebalancing Costs	Cost of Revenue, Selling, General and Administrative Expense, Workforce Rebalancing Costs
Workforce Rebalancing Liabilities Inherited from Former Parent
RESTRUCTURING
Charges			$ 4
Fiscal 2026 Program
RESTRUCTURING
Charges	$ 60
Fiscal 2025 Program
RESTRUCTURING
Charges		$ 162		$ 162
Fiscal 2024 Program
RESTRUCTURING
Charges			174		$ 310
Cost of service
RESTRUCTURING
Charges	$ 0	$ 45	$ 23
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of Revenue	Cost of Revenue	Cost of Revenue
Cost of service \| Fiscal 2026 Program
RESTRUCTURING
Charges	$ 0
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of Revenue
Cost of service \| Fiscal 2025 Program
RESTRUCTURING
Charges				$ 45
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]				Cost of Revenue
Cost of service \| Fiscal 2024 Program
RESTRUCTURING
Charges					$ 94
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]					Cost of Revenue
Selling, general and administrative expense
RESTRUCTURING
Charges	$ 0	$ 3	$ 16
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Workforce Rebalancing Costs	Workforce Rebalancing Costs	Workforce Rebalancing Costs
Selling, general and administrative expense \| Fiscal 2026 Program
RESTRUCTURING
Charges	$ 0
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Selling, General and Administrative Expense
Selling, general and administrative expense \| Fiscal 2025 Program
RESTRUCTURING
Charges				$ 3
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]				Selling, General and Administrative Expense
Selling, general and administrative expense \| Fiscal 2024 Program
RESTRUCTURING
Charges					$ 25
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]					Selling, General and Administrative Expense
Workforce rebalancing charges
RESTRUCTURING
Charges	$ 60	$ 114	$ 135
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Workforce Rebalancing Costs	Workforce Rebalancing Costs	Workforce Rebalancing Costs
Workforce rebalancing charges \| Fiscal 2026 Program
RESTRUCTURING
Charges	$ 60
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]	Workforce Rebalancing Costs
Workforce rebalancing charges \| Fiscal 2025 Program
RESTRUCTURING
Charges				$ 114
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]				Workforce Rebalancing Costs
Workforce rebalancing charges \| Fiscal 2024 Program
RESTRUCTURING
Charges					$ 190
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]					Workforce Rebalancing Costs