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FINANCIAL ASSETS AND LIABILITIES - Foreign Exchange Risk (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Sep. 30, 2023
Mar. 31, 2023
Not designated as hedging instruments - economic hedges | Currency swaps    
Derivatives, Fair Value [Line Items]    
Notional amount $ 1,600 $ 1,500
Not designated as hedging instruments - economic hedges | Currency swaps | Maximum    
Derivatives, Fair Value [Line Items]    
Term of contract 1 year  
Derivative instruments in cash flow hedges | Designated as hedging instruments | Foreign exchange contracts    
Derivatives, Fair Value [Line Items]    
Net gains from derivatives $ 22 1
Deferred net gains on derivatives reclassified to net income 22  
Derivative instruments in cash flow hedges | Designated as hedging instruments | Foreign exchange forward contracts    
Derivatives, Fair Value [Line Items]    
Notional amount $ 644 $ 283
Maximum length of time hedged 1 year  
Weighted average remaining maturity 4 months 24 days 6 months