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Derivative Financial Instruments Gross Notional Amounts and Fair Values for Currency Derivatives (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Mar. 31, 2025
Forward contracts to purchase    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair value of foreign currency contracts outstanding, Assets $ 7 $ 4
Fair value of foreign currency contracts outstanding, Liabilities 2 7
Forward contracts to sell    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair value of foreign currency contracts outstanding, Assets 3 20
Fair value of foreign currency contracts outstanding, Liabilities 83 16
Designated as Hedging Instrument | Forward contracts to purchase    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Amount 355 463
Designated as Hedging Instrument | Forward contracts to sell    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Amount 2,063 1,970
United States Dollar | Not Designated as Hedging Instrument | Forward contracts to purchase    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Amount 744 511
United States Dollar | Not Designated as Hedging Instrument | Forward contracts to sell    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Notional Amount 770 582
Balance Sheet Hedging | Not Designated as Hedging Instrument | Forward contracts to purchase    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative Asset, Current 0 1
Derivative Liability, Current 3 2
Balance Sheet Hedging | Not Designated as Hedging Instrument | Forward contracts to sell    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative Asset, Current 2 3
Derivative Liability, Current $ 0 $ 1